projects/linux·blob 101142c3 · refs

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1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 25
4EXTRAVERSION = -rc2
5NAME = Funky Weasel is Jiggy wit it
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# We are using a recursive build, so we need to do a little thinking
20# to get the ordering right.
21#
22# Most importantly: sub-Makefiles should only ever modify files in
23# their own directory. If in some directory we have a dependency on
24# a file in another dir (which doesn't happen often, but it's often
25# unavoidable when linking the built-in.o targets which finally
26# turn into vmlinux), we will call a sub make in that other dir, and
27# after that we are sure that everything which is in that other dir
28# is now up to date.
29#
30# The only cases where we need to modify files which have global
31# effects are thus separated out and done before the recursive
32# descending is started. They are now explicitly listed as the
33# prepare rule.
34
35# To put more focus on warnings, be less verbose as default
36# Use 'make V=1' to see the full commands
37
38ifdef V
39 ifeq ("$(origin V)", "command line")
40 KBUILD_VERBOSE = $(V)
41 endif
42endif
43ifndef KBUILD_VERBOSE
44 KBUILD_VERBOSE = 0
45endif
46
47# Call a source code checker (by default, "sparse") as part of the
48# C compilation.
49#
50# Use 'make C=1' to enable checking of only re-compiled files.
51# Use 'make C=2' to enable checking of *all* source files, regardless
52# of whether they are re-compiled or not.
53#
54# See the file "Documentation/sparse.txt" for more details, including
55# where to get the "sparse" utility.
56
57ifdef C
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
60 endif
61endif
62ifndef KBUILD_CHECKSRC
63 KBUILD_CHECKSRC = 0
64endif
65
66# Use make M=dir to specify directory of external module to build
67# Old syntax make ... SUBDIRS=$PWD is still supported
68# Setting the environment variable KBUILD_EXTMOD take precedence
69ifdef SUBDIRS
70 KBUILD_EXTMOD ?= $(SUBDIRS)
71endif
72ifdef M
73 ifeq ("$(origin M)", "command line")
74 KBUILD_EXTMOD := $(M)
75 endif
76endif
77
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifdef O
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
104 endif
105endif
106
107# That's our default target when none is given on the command line
108PHONY := _all
109_all:
110
111# Cancel implicit rules on top Makefile
112$(CURDIR)/Makefile Makefile: ;
113
114ifneq ($(KBUILD_OUTPUT),)
115# Invoke a second make in the output directory, passing relevant variables
116# check that the output directory actually exists
117saved-output := $(KBUILD_OUTPUT)
118KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119$(if $(KBUILD_OUTPUT),, \
120 $(error output directory "$(saved-output)" does not exist))
121
122PHONY += $(MAKECMDGOALS) sub-make
123
124$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
125 $(Q)@:
126
127sub-make: FORCE
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
132
133# Leave processing to above invocation of make
134skip-makefile := 1
135endif # ifneq ($(KBUILD_OUTPUT),)
136endif # ifeq ($(KBUILD_SRC),)
137
138# We process the rest of the Makefile if this is the final invocation of make
139ifeq ($(skip-makefile),)
140
141# If building an external module we do not care about the all: rule
142# but instead _all depend on modules
143PHONY += all
144ifeq ($(KBUILD_EXTMOD),)
145_all: all
146else
147_all: modules
148endif
149
150srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151TOPDIR := $(srctree)
152# FIXME - TOPDIR is obsolete, use srctree/objtree
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH TOPDIR
160
161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh.*/sh/ )
173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# Default value for CROSS_COMPILE is not to prefix executables
191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192
193ARCH ?= $(SUBARCH)
194CROSS_COMPILE ?=
195
196# Architecture as present in compile.h
197UTS_MACHINE := $(ARCH)
198SRCARCH := $(ARCH)
199
200# Additional ARCH settings for x86
201ifeq ($(ARCH),i386)
202 SRCARCH := x86
203endif
204ifeq ($(ARCH),x86_64)
205 SRCARCH := x86
206endif
207
208KCONFIG_CONFIG ?= .config
209
210# SHELL used by kbuild
211CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
212 else if [ -x /bin/bash ]; then echo /bin/bash; \
213 else echo sh; fi ; fi)
214
215HOSTCC = gcc
216HOSTCXX = g++
217HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
218HOSTCXXFLAGS = -O2
219
220# Decide whether to build built-in, modular, or both.
221# Normally, just do built-in.
222
223KBUILD_MODULES :=
224KBUILD_BUILTIN := 1
225
226# If we have only "make modules", don't compile built-in objects.
227# When we're building modules with modversions, we need to consider
228# the built-in objects during the descend as well, in order to
229# make sure the checksums are up to date before we record them.
230
231ifeq ($(MAKECMDGOALS),modules)
232 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
233endif
234
235# If we have "make <whatever> modules", compile modules
236# in addition to whatever we do anyway.
237# Just "make" or "make all" shall build modules as well
238
239ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
240 KBUILD_MODULES := 1
241endif
242
243ifeq ($(MAKECMDGOALS),)
244 KBUILD_MODULES := 1
245endif
246
247export KBUILD_MODULES KBUILD_BUILTIN
248export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
249
250# Beautify output
251# ---------------------------------------------------------------------------
252#
253# Normally, we echo the whole command before executing it. By making
254# that echo $($(quiet)$(cmd)), we now have the possibility to set
255# $(quiet) to choose other forms of output instead, e.g.
256#
257# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
258# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
259#
260# If $(quiet) is empty, the whole command will be printed.
261# If it is set to "quiet_", only the short version will be printed.
262# If it is set to "silent_", nothing will be printed at all, since
263# the variable $(silent_cmd_cc_o_c) doesn't exist.
264#
265# A simple variant is to prefix commands with $(Q) - that's useful
266# for commands that shall be hidden in non-verbose mode.
267#
268# $(Q)ln $@ :<
269#
270# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
271# If KBUILD_VERBOSE equals 1 then the above command is displayed.
272
273ifeq ($(KBUILD_VERBOSE),1)
274 quiet =
275 Q =
276else
277 quiet=quiet_
278 Q = @
279endif
280
281# If the user is running make -s (silent mode), suppress echoing of
282# commands
283
284ifneq ($(findstring s,$(MAKEFLAGS)),)
285 quiet=silent_
286endif
287
288export quiet Q KBUILD_VERBOSE
289
290
291# Look for make include files relative to root of kernel src
292MAKEFLAGS += --include-dir=$(srctree)
293
294# We need some generic definitions (do not try to remake the file).
295$(srctree)/scripts/Kbuild.include: ;
296include $(srctree)/scripts/Kbuild.include
297
298# Make variables (CC, etc...)
299
300AS = $(CROSS_COMPILE)as
301LD = $(CROSS_COMPILE)ld
302CC = $(CROSS_COMPILE)gcc
303CPP = $(CC) -E
304AR = $(CROSS_COMPILE)ar
305NM = $(CROSS_COMPILE)nm
306STRIP = $(CROSS_COMPILE)strip
307OBJCOPY = $(CROSS_COMPILE)objcopy
308OBJDUMP = $(CROSS_COMPILE)objdump
309AWK = awk
310GENKSYMS = scripts/genksyms/genksyms
311DEPMOD = /sbin/depmod
312KALLSYMS = scripts/kallsyms
313PERL = perl
314CHECK = sparse
315
316CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
317MODFLAGS = -DMODULE
318CFLAGS_MODULE = $(MODFLAGS)
319AFLAGS_MODULE = $(MODFLAGS)
320LDFLAGS_MODULE =
321CFLAGS_KERNEL =
322AFLAGS_KERNEL =
323
324
325# Use LINUXINCLUDE when you must reference the include/ directory.
326# Needed to be compatible with the O= option
327LINUXINCLUDE := -Iinclude \
328 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
329 -include include/linux/autoconf.h
330
331KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
332
333KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
334 -fno-strict-aliasing -fno-common \
335 -Werror-implicit-function-declaration
336KBUILD_AFLAGS := -D__ASSEMBLY__
337
338# Read KERNELRELEASE from include/config/kernel.release (if it exists)
339KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
340KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
341
342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
344export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
345export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
346
347export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
348export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
349export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
350
351# When compiling out-of-tree modules, put MODVERDIR in the module
352# tree rather than in the kernel tree. The kernel tree might
353# even be read-only.
354export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
355
356# Files to ignore in find ... statements
357
358RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
359export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
360
361# ===========================================================================
362# Rules shared between *config targets and build targets
363
364# Basic helpers built in scripts/
365PHONY += scripts_basic
366scripts_basic:
367 $(Q)$(MAKE) $(build)=scripts/basic
368
369# To avoid any implicit rule to kick in, define an empty command.
370scripts/basic/%: scripts_basic ;
371
372PHONY += outputmakefile
373# outputmakefile generates a Makefile in the output directory, if using a
374# separate output directory. This allows convenient use of make in the
375# output directory.
376outputmakefile:
377ifneq ($(KBUILD_SRC),)
378 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
379 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
380endif
381
382# To make sure we do not include .config for any of the *config targets
383# catch them early, and hand them over to scripts/kconfig/Makefile
384# It is allowed to specify more targets when calling make, including
385# mixing *config targets and build targets.
386# For example 'make oldconfig all'.
387# Detect when mixed targets is specified, and make a second invocation
388# of make so .config is not included in this case either (for *config).
389
390no-dot-config-targets := clean mrproper distclean \
391 cscope TAGS tags help %docs check% \
392 include/linux/version.h headers_% \
393 kernelrelease kernelversion
394
395config-targets := 0
396mixed-targets := 0
397dot-config := 1
398
399ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
400 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
401 dot-config := 0
402 endif
403endif
404
405ifeq ($(KBUILD_EXTMOD),)
406 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
407 config-targets := 1
408 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
409 mixed-targets := 1
410 endif
411 endif
412endif
413
414ifeq ($(mixed-targets),1)
415# ===========================================================================
416# We're called with mixed targets (*config and build targets).
417# Handle them one by one.
418
419%:: FORCE
420 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
421
422else
423ifeq ($(config-targets),1)
424# ===========================================================================
425# *config targets only - make sure prerequisites are updated, and descend
426# in scripts/kconfig to make the *config target
427
428# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
429# KBUILD_DEFCONFIG may point out an alternative default configuration
430# used for 'make defconfig'
431include $(srctree)/arch/$(SRCARCH)/Makefile
432export KBUILD_DEFCONFIG
433
434config %config: scripts_basic outputmakefile FORCE
435 $(Q)mkdir -p include/linux include/config
436 $(Q)$(MAKE) $(build)=scripts/kconfig $@
437
438else
439# ===========================================================================
440# Build targets only - this includes vmlinux, arch specific targets, clean
441# targets and others. In general all targets except *config targets.
442
443ifeq ($(KBUILD_EXTMOD),)
444# Additional helpers built in scripts/
445# Carefully list dependencies so we do not try to build scripts twice
446# in parallel
447PHONY += scripts
448scripts: scripts_basic include/config/auto.conf
449 $(Q)$(MAKE) $(build)=$(@)
450
451# Objects we will link into vmlinux / subdirs we need to visit
452init-y := init/
453drivers-y := drivers/ sound/
454net-y := net/
455libs-y := lib/
456core-y := usr/
457endif # KBUILD_EXTMOD
458
459ifeq ($(dot-config),1)
460# Read in config
461-include include/config/auto.conf
462
463ifeq ($(KBUILD_EXTMOD),)
464# Read in dependencies to all Kconfig* files, make sure to run
465# oldconfig if changes are detected.
466-include include/config/auto.conf.cmd
467
468# To avoid any implicit rule to kick in, define an empty command
469$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
470
471# If .config is newer than include/config/auto.conf, someone tinkered
472# with it and forgot to run make oldconfig.
473# if auto.conf.cmd is missing then we are probably in a cleaned tree so
474# we execute the config step to be sure to catch updated Kconfig files
475include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
476 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
477else
478# external modules needs include/linux/autoconf.h and include/config/auto.conf
479# but do not care if they are up-to-date. Use auto.conf to trigger the test
480PHONY += include/config/auto.conf
481
482include/config/auto.conf:
483 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
484 echo; \
485 echo " ERROR: Kernel configuration is invalid."; \
486 echo " include/linux/autoconf.h or $@ are missing."; \
487 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
488 echo; \
489 /bin/false)
490
491endif # KBUILD_EXTMOD
492
493else
494# Dummy target needed, because used as prerequisite
495include/config/auto.conf: ;
496endif # $(dot-config)
497
498# The all: target is the default when no target is given on the
499# command line.
500# This allow a user to issue only 'make' to build a kernel including modules
501# Defaults vmlinux but it is usually overridden in the arch makefile
502all: vmlinux
503
504ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
505KBUILD_CFLAGS += -Os
506else
507KBUILD_CFLAGS += -O2
508endif
509
510include $(srctree)/arch/$(SRCARCH)/Makefile
511
512ifdef CONFIG_FRAME_POINTER
513KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
514else
515KBUILD_CFLAGS += -fomit-frame-pointer
516endif
517
518ifdef CONFIG_DEBUG_INFO
519KBUILD_CFLAGS += -g
520KBUILD_AFLAGS += -gdwarf-2
521endif
522
523# We trigger additional mismatches with less inlining
524ifdef CONFIG_DEBUG_SECTION_MISMATCH
525KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
526endif
527
528# Force gcc to behave correct even for buggy distributions
529KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
530
531# arch Makefile may override CC so keep this after arch Makefile is included
532NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
533CHECKFLAGS += $(NOSTDINC_FLAGS)
534
535# warn about C99 declaration after statement
536KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
537
538# disable pointer signed / unsigned warnings in gcc 4.0
539KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
540
541# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
542# But warn user when we do so
543warn-assign = \
544$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
545
546ifneq ($(KCPPFLAGS),)
547 $(call warn-assign,CPPFLAGS)
548 KBUILD_CPPFLAGS += $(KCPPFLAGS)
549endif
550ifneq ($(KAFLAGS),)
551 $(call warn-assign,AFLAGS)
552 KBUILD_AFLAGS += $(KAFLAGS)
553endif
554ifneq ($(KCFLAGS),)
555 $(call warn-assign,CFLAGS)
556 KBUILD_CFLAGS += $(KCFLAGS)
557endif
558
559# Use --build-id when available.
560LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
561 $(call ld-option, -Wl$(comma)--build-id,))
562LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
563LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
564
565# Default kernel image to build when no specific target is given.
566# KBUILD_IMAGE may be overruled on the command line or
567# set in the environment
568# Also any assignments in arch/$(ARCH)/Makefile take precedence over
569# this default value
570export KBUILD_IMAGE ?= vmlinux
571
572#
573# INSTALL_PATH specifies where to place the updated kernel and system map
574# images. Default is /boot, but you can set it to other values
575export INSTALL_PATH ?= /boot
576
577#
578# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
579# relocations required by build roots. This is not defined in the
580# makefile but the argument can be passed to make if needed.
581#
582
583MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
584export MODLIB
585
586#
587# INSTALL_MOD_STRIP, if defined, will cause modules to be
588# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
589# the default option --strip-debug will be used. Otherwise,
590# INSTALL_MOD_STRIP will used as the options to the strip command.
591
592ifdef INSTALL_MOD_STRIP
593ifeq ($(INSTALL_MOD_STRIP),1)
594mod_strip_cmd = $(STRIP) --strip-debug
595else
596mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
597endif # INSTALL_MOD_STRIP=1
598else
599mod_strip_cmd = true
600endif # INSTALL_MOD_STRIP
601export mod_strip_cmd
602
603
604ifeq ($(KBUILD_EXTMOD),)
605core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
606
607vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
608 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
609 $(net-y) $(net-m) $(libs-y) $(libs-m)))
610
611vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
612 $(init-n) $(init-) \
613 $(core-n) $(core-) $(drivers-n) $(drivers-) \
614 $(net-n) $(net-) $(libs-n) $(libs-))))
615
616init-y := $(patsubst %/, %/built-in.o, $(init-y))
617core-y := $(patsubst %/, %/built-in.o, $(core-y))
618drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
619net-y := $(patsubst %/, %/built-in.o, $(net-y))
620libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
621libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
622libs-y := $(libs-y1) $(libs-y2)
623
624# Build vmlinux
625# ---------------------------------------------------------------------------
626# vmlinux is built from the objects selected by $(vmlinux-init) and
627# $(vmlinux-main). Most are built-in.o files from top-level directories
628# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
629# Ordering when linking is important, and $(vmlinux-init) must be first.
630#
631# vmlinux
632# ^
633# |
634# +-< $(vmlinux-init)
635# | +--< init/version.o + more
636# |
637# +--< $(vmlinux-main)
638# | +--< driver/built-in.o mm/built-in.o + more
639# |
640# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
641#
642# vmlinux version (uname -v) cannot be updated during normal
643# descending-into-subdirs phase since we do not yet know if we need to
644# update vmlinux.
645# Therefore this step is delayed until just before final link of vmlinux -
646# except in the kallsyms case where it is done just before adding the
647# symbols to the kernel.
648#
649# System.map is generated to document addresses of all kernel symbols
650
651vmlinux-init := $(head-y) $(init-y)
652vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
653vmlinux-all := $(vmlinux-init) $(vmlinux-main)
654vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
655export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
656
657# Rule to link vmlinux - also used during CONFIG_KALLSYMS
658# May be overridden by arch/$(ARCH)/Makefile
659quiet_cmd_vmlinux__ ?= LD $@
660 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
661 -T $(vmlinux-lds) $(vmlinux-init) \
662 --start-group $(vmlinux-main) --end-group \
663 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
664
665# Generate new vmlinux version
666quiet_cmd_vmlinux_version = GEN .version
667 cmd_vmlinux_version = set -e; \
668 if [ ! -r .version ]; then \
669 rm -f .version; \
670 echo 1 >.version; \
671 else \
672 mv .version .old_version; \
673 expr 0$$(cat .old_version) + 1 >.version; \
674 fi; \
675 $(MAKE) $(build)=init
676
677# Generate System.map
678quiet_cmd_sysmap = SYSMAP
679 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
680
681# Link of vmlinux
682# If CONFIG_KALLSYMS is set .version is already updated
683# Generate System.map and verify that the content is consistent
684# Use + in front of the vmlinux_version rule to silent warning with make -j2
685# First command is ':' to allow us to use + in front of the rule
686define rule_vmlinux__
687 :
688 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
689
690 $(call cmd,vmlinux__)
691 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
692
693 $(Q)$(if $($(quiet)cmd_sysmap), \
694 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
695 $(cmd_sysmap) $@ System.map; \
696 if [ $$? -ne 0 ]; then \
697 rm -f $@; \
698 /bin/false; \
699 fi;
700 $(verify_kallsyms)
701endef
702
703
704ifdef CONFIG_KALLSYMS
705# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
706# It's a three stage process:
707# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
708# empty
709# Running kallsyms on that gives us .tmp_kallsyms1.o with
710# the right size - vmlinux version (uname -v) is updated during this step
711# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
712# but due to the added section, some addresses have shifted.
713# From here, we generate a correct .tmp_kallsyms2.o
714# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
715# o Verify that the System.map from vmlinux matches the map from
716# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
717# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
718# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
719# temporary bypass to allow the kernel to be built while the
720# maintainers work out what went wrong with kallsyms.
721
722ifdef CONFIG_KALLSYMS_EXTRA_PASS
723last_kallsyms := 3
724else
725last_kallsyms := 2
726endif
727
728kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
729
730define verify_kallsyms
731 $(Q)$(if $($(quiet)cmd_sysmap), \
732 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
733 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
734 $(Q)cmp -s System.map .tmp_System.map || \
735 (echo Inconsistent kallsyms data; \
736 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
737 rm .tmp_kallsyms* ; /bin/false )
738endef
739
740# Update vmlinux version before link
741# Use + in front of this rule to silent warning about make -j1
742# First command is ':' to allow us to use + in front of this rule
743cmd_ksym_ld = $(cmd_vmlinux__)
744define rule_ksym_ld
745 :
746 +$(call cmd,vmlinux_version)
747 $(call cmd,vmlinux__)
748 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
749endef
750
751# Generate .S file with all kernel symbols
752quiet_cmd_kallsyms = KSYM $@
753 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
754 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
755
756.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
757 $(call if_changed_dep,as_o_S)
758
759.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
760 $(call cmd,kallsyms)
761
762# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
763.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
764 $(call if_changed_rule,ksym_ld)
765
766.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
767 $(call if_changed,vmlinux__)
768
769.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
770 $(call if_changed,vmlinux__)
771
772# Needs to visit scripts/ before $(KALLSYMS) can be used.
773$(KALLSYMS): scripts ;
774
775# Generate some data for debugging strange kallsyms problems
776debug_kallsyms: .tmp_map$(last_kallsyms)
777
778.tmp_map%: .tmp_vmlinux% FORCE
779 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
780
781.tmp_map3: .tmp_map2
782
783.tmp_map2: .tmp_map1
784
785endif # ifdef CONFIG_KALLSYMS
786
787# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
788# relevant sections renamed as per the linker script.
789quiet_cmd_vmlinux-modpost = LD $@
790 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
791 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
792 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
793define rule_vmlinux-modpost
794 :
795 +$(call cmd,vmlinux-modpost)
796 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
798endef
799
800# vmlinux image - including updated kernel symbols
801vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
802ifdef CONFIG_HEADERS_CHECK
803 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
804endif
805ifdef CONFIG_SAMPLES
806 $(Q)$(MAKE) $(build)=samples
807endif
808 $(call vmlinux-modpost)
809 $(call if_changed_rule,vmlinux__)
810 $(Q)rm -f .old_version
811
812# build vmlinux.o first to catch section mismatch errors early
813$(kallsyms.o): vmlinux.o
814vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE
815 $(call if_changed_rule,vmlinux-modpost)
816
817# The actual objects are generated when descending,
818# make sure no implicit rule kicks in
819$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
820
821# Handle descending into subdirectories listed in $(vmlinux-dirs)
822# Preset locale variables to speed up the build process. Limit locale
823# tweaks to this spot to avoid wrong language settings when running
824# make menuconfig etc.
825# Error messages still appears in the original language
826
827PHONY += $(vmlinux-dirs)
828$(vmlinux-dirs): prepare scripts
829 $(Q)$(MAKE) $(build)=$@
830
831# Build the kernel release string
832#
833# The KERNELRELEASE value built here is stored in the file
834# include/config/kernel.release, and is used when executing several
835# make targets, such as "make install" or "make modules_install."
836#
837# The eventual kernel release string consists of the following fields,
838# shown in a hierarchical format to show how smaller parts are concatenated
839# to form the larger and final value, with values coming from places like
840# the Makefile, kernel config options, make command line options and/or
841# SCM tag information.
842#
843# $(KERNELVERSION)
844# $(VERSION) eg, 2
845# $(PATCHLEVEL) eg, 6
846# $(SUBLEVEL) eg, 18
847# $(EXTRAVERSION) eg, -rc6
848# $(localver-full)
849# $(localver)
850# localversion* (files without backups, containing '~')
851# $(CONFIG_LOCALVERSION) (from kernel config setting)
852# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
853# ./scripts/setlocalversion (SCM tag, if one exists)
854# $(LOCALVERSION) (from make command line if provided)
855#
856# Note how the final $(localver-auto) string is included *only* if the
857# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
858# moment, only git is supported but other SCMs can edit the script
859# scripts/setlocalversion and add the appropriate checks as needed.
860
861pattern = ".*/localversion[^~]*"
862string = $(shell cat /dev/null \
863 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
864
865localver = $(subst $(space),, $(string) \
866 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
867
868# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
869# and if the SCM is know a tag from the SCM is appended.
870# The appended tag is determined by the SCM used.
871#
872# Currently, only git is supported.
873# Other SCMs can edit scripts/setlocalversion and add the appropriate
874# checks as needed.
875ifdef CONFIG_LOCALVERSION_AUTO
876 _localver-auto = $(shell $(CONFIG_SHELL) \
877 $(srctree)/scripts/setlocalversion $(srctree))
878 localver-auto = $(LOCALVERSION)$(_localver-auto)
879endif
880
881localver-full = $(localver)$(localver-auto)
882
883# Store (new) KERNELRELASE string in include/config/kernel.release
884kernelrelease = $(KERNELVERSION)$(localver-full)
885include/config/kernel.release: include/config/auto.conf FORCE
886 $(Q)rm -f $@
887 $(Q)echo $(kernelrelease) > $@
888
889
890# Things we need to do before we recursively start building the kernel
891# or the modules are listed in "prepare".
892# A multi level approach is used. prepareN is processed before prepareN-1.
893# archprepare is used in arch Makefiles and when processed asm symlink,
894# version.h and scripts_basic is processed / created.
895
896# Listed in dependency order
897PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
898
899# prepare3 is used to check if we are building in a separate output directory,
900# and if so do:
901# 1) Check that make has not been executed in the kernel src $(srctree)
902# 2) Create the include2 directory, used for the second asm symlink
903prepare3: include/config/kernel.release
904ifneq ($(KBUILD_SRC),)
905 @echo ' Using $(srctree) as source for kernel'
906 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
907 echo " $(srctree) is not clean, please run 'make mrproper'";\
908 echo " in the '$(srctree)' directory.";\
909 /bin/false; \
910 fi;
911 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
912 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
913endif
914
915# prepare2 creates a makefile if using a separate output directory
916prepare2: prepare3 outputmakefile
917
918prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
919 include/asm include/config/auto.conf
920 $(cmd_crmodverdir)
921
922archprepare: prepare1 scripts_basic
923
924prepare0: archprepare FORCE
925 $(Q)$(MAKE) $(build)=.
926 $(Q)$(MAKE) $(build)=. missing-syscalls
927
928# All the preparing..
929prepare: prepare0
930
931# Leave this as default for preprocessing vmlinux.lds.S, which is now
932# done in arch/$(ARCH)/kernel/Makefile
933
934export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
935
936# The asm symlink changes when $(ARCH) changes.
937# Detect this and ask user to run make mrproper
938
939include/asm: FORCE
940 $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \
941 if [ -L include/asm ]; then \
942 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
943 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
944 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
945 exit 1; \
946 fi; \
947 else \
948 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
949 if [ ! -d include ]; then \
950 mkdir -p include; \
951 fi; \
952 ln -fsn asm-$(SRCARCH) $@; \
953 fi
954
955# Generate some files
956# ---------------------------------------------------------------------------
957
958# KERNELRELEASE can change from a few different places, meaning version.h
959# needs to be updated, so this check is forced on all builds
960
961uts_len := 64
962define filechk_utsrelease.h
963 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
964 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
965 exit 1; \
966 fi; \
967 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
968endef
969
970define filechk_version.h
971 (echo \#define LINUX_VERSION_CODE $(shell \
972 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
973 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
974endef
975
976include/linux/version.h: $(srctree)/Makefile FORCE
977 $(call filechk,version.h)
978
979include/linux/utsrelease.h: include/config/kernel.release FORCE
980 $(call filechk,utsrelease.h)
981
982# ---------------------------------------------------------------------------
983
984PHONY += depend dep
985depend dep:
986 @echo '*** Warning: make $@ is unnecessary now.'
987
988# ---------------------------------------------------------------------------
989# Kernel headers
990INSTALL_HDR_PATH=$(objtree)/usr
991export INSTALL_HDR_PATH
992
993HDRFILTER=generic i386 x86_64
994HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
995
996PHONY += headers_install_all
997headers_install_all: include/linux/version.h scripts_basic FORCE
998 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
999 $(Q)for arch in $(HDRARCHES); do \
1000 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1001 done
1002
1003PHONY += headers_install
1004headers_install: include/linux/version.h scripts_basic FORCE
1005 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1006 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1007 exit 1 ; fi
1008 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1009 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1010
1011PHONY += headers_check_all
1012headers_check_all: headers_install_all
1013 $(Q)for arch in $(HDRARCHES); do \
1014 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1015 done
1016
1017PHONY += headers_check
1018headers_check: headers_install
1019 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1020
1021# ---------------------------------------------------------------------------
1022# Modules
1023
1024ifdef CONFIG_MODULES
1025
1026# By default, build modules as well
1027
1028all: modules
1029
1030# Build modules
1031#
1032# A module can be listed more than once in obj-m resulting in
1033# duplicate lines in modules.order files. Those are removed
1034# using awk while concatenating to the final file.
1035
1036PHONY += modules
1037modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1038 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1039 @echo ' Building modules, stage 2.';
1040 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1041
1042
1043# Target to prepare building external modules
1044PHONY += modules_prepare
1045modules_prepare: prepare scripts
1046
1047# Target to install modules
1048PHONY += modules_install
1049modules_install: _modinst_ _modinst_post
1050
1051PHONY += _modinst_
1052_modinst_:
1053 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1054 echo "Warning: you may need to install module-init-tools"; \
1055 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1056 sleep 1; \
1057 fi
1058 @rm -rf $(MODLIB)/kernel
1059 @rm -f $(MODLIB)/source
1060 @mkdir -p $(MODLIB)/kernel
1061 @ln -s $(srctree) $(MODLIB)/source
1062 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1063 rm -f $(MODLIB)/build ; \
1064 ln -s $(objtree) $(MODLIB)/build ; \
1065 fi
1066 @cp -f $(objtree)/modules.order $(MODLIB)/
1067 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1068
1069# This depmod is only for convenience to give the initial
1070# boot a modules.dep even before / is mounted read-write. However the
1071# boot script depmod is the master version.
1072PHONY += _modinst_post
1073_modinst_post: _modinst_
1074 $(call cmd,depmod)
1075
1076else # CONFIG_MODULES
1077
1078# Modules not configured
1079# ---------------------------------------------------------------------------
1080
1081modules modules_install: FORCE
1082 @echo
1083 @echo "The present kernel configuration has modules disabled."
1084 @echo "Type 'make config' and enable loadable module support."
1085 @echo "Then build a kernel with module support enabled."
1086 @echo
1087 @exit 1
1088
1089endif # CONFIG_MODULES
1090
1091###
1092# Cleaning is done on three levels.
1093# make clean Delete most generated files
1094# Leave enough to build external modules
1095# make mrproper Delete the current configuration, and all generated files
1096# make distclean Remove editor backup files, patch leftover files and the like
1097
1098# Directories & files removed with 'make clean'
1099CLEAN_DIRS += $(MODVERDIR)
1100CLEAN_FILES += vmlinux System.map \
1101 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1102
1103# Directories & files removed with 'make mrproper'
1104MRPROPER_DIRS += include/config include2 usr/include
1105MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1106 include/linux/autoconf.h include/linux/version.h \
1107 include/linux/utsrelease.h \
1108 Module.symvers tags TAGS cscope*
1109
1110# clean - Delete most, but leave enough to build external modules
1111#
1112clean: rm-dirs := $(CLEAN_DIRS)
1113clean: rm-files := $(CLEAN_FILES)
1114clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1115
1116PHONY += $(clean-dirs) clean archclean
1117$(clean-dirs):
1118 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1119
1120clean: archclean $(clean-dirs)
1121 $(call cmd,rmdirs)
1122 $(call cmd,rmfiles)
1123 @find . $(RCS_FIND_IGNORE) \
1124 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1125 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1126 -o -name '*.symtypes' -o -name 'modules.order' \) \
1127 -type f -print | xargs rm -f
1128
1129# mrproper - Delete all generated files, including .config
1130#
1131mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1132mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1133mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1134
1135PHONY += $(mrproper-dirs) mrproper archmrproper
1136$(mrproper-dirs):
1137 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1138
1139mrproper: clean archmrproper $(mrproper-dirs)
1140 $(call cmd,rmdirs)
1141 $(call cmd,rmfiles)
1142
1143# distclean
1144#
1145PHONY += distclean
1146
1147distclean: mrproper
1148 @find $(srctree) $(RCS_FIND_IGNORE) \
1149 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1150 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1151 -o -name '.*.rej' -o -size 0 \
1152 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1153 -type f -print | xargs rm -f
1154
1155
1156# Packaging of the kernel to various formats
1157# ---------------------------------------------------------------------------
1158# rpm target kept for backward compatibility
1159package-dir := $(srctree)/scripts/package
1160
1161%pkg: include/config/kernel.release FORCE
1162 $(Q)$(MAKE) $(build)=$(package-dir) $@
1163rpm: include/config/kernel.release FORCE
1164 $(Q)$(MAKE) $(build)=$(package-dir) $@
1165
1166
1167# Brief documentation of the typical targets used
1168# ---------------------------------------------------------------------------
1169
1170boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1171boards := $(notdir $(boards))
1172
1173help:
1174 @echo 'Cleaning targets:'
1175 @echo ' clean - Remove most generated files but keep the config and'
1176 @echo ' enough build support to build external modules'
1177 @echo ' mrproper - Remove all generated files + config + various backup files'
1178 @echo ' distclean - mrproper + remove editor backup and patch files'
1179 @echo ''
1180 @echo 'Configuration targets:'
1181 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1182 @echo ''
1183 @echo 'Other generic targets:'
1184 @echo ' all - Build all targets marked with [*]'
1185 @echo '* vmlinux - Build the bare kernel'
1186 @echo '* modules - Build all modules'
1187 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1188 @echo ' dir/ - Build all files in dir and below'
1189 @echo ' dir/file.[ois] - Build specified target only'
1190 @echo ' dir/file.ko - Build module including final link'
1191 @echo ' prepare - Set up for building external modules'
1192 @echo ' tags/TAGS - Generate tags file for editors'
1193 @echo ' cscope - Generate cscope index'
1194 @echo ' kernelrelease - Output the release version string'
1195 @echo ' kernelversion - Output the version stored in Makefile'
1196 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1197 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1198 echo ' (default: $(INSTALL_HDR_PATH))'; \
1199 fi
1200 @echo ''
1201 @echo 'Static analysers'
1202 @echo ' checkstack - Generate a list of stack hogs'
1203 @echo ' namespacecheck - Name space analysis on compiled kernel'
1204 @echo ' versioncheck - Sanity check on version.h usage'
1205 @echo ' includecheck - Check for duplicate included header files'
1206 @echo ' export_report - List the usages of all exported symbols'
1207 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1208 echo ' headers_check - Sanity check on exported headers'; \
1209 fi
1210 @echo ''
1211 @echo 'Kernel packaging:'
1212 @$(MAKE) $(build)=$(package-dir) help
1213 @echo ''
1214 @echo 'Documentation targets:'
1215 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1216 @echo ''
1217 @echo 'Architecture specific targets ($(ARCH)):'
1218 @$(if $(archhelp),$(archhelp),\
1219 echo ' No architecture specific help defined for $(ARCH)')
1220 @echo ''
1221 @$(if $(boards), \
1222 $(foreach b, $(boards), \
1223 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1224 echo '')
1225
1226 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1227 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1228 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1229 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1230 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1231 @echo ''
1232 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1233 @echo 'For further info see the ./README file'
1234
1235
1236# Documentation targets
1237# ---------------------------------------------------------------------------
1238%docs: scripts_basic FORCE
1239 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1240
1241else # KBUILD_EXTMOD
1242
1243###
1244# External module support.
1245# When building external modules the kernel used as basis is considered
1246# read-only, and no consistency checks are made and the make
1247# system is not used on the basis kernel. If updates are required
1248# in the basis kernel ordinary make commands (without M=...) must
1249# be used.
1250#
1251# The following are the only valid targets when building external
1252# modules.
1253# make M=dir clean Delete all automatically generated files
1254# make M=dir modules Make all modules in specified dir
1255# make M=dir Same as 'make M=dir modules'
1256# make M=dir modules_install
1257# Install the modules built in the module directory
1258# Assumes install directory is already created
1259
1260# We are always building modules
1261KBUILD_MODULES := 1
1262PHONY += crmodverdir
1263crmodverdir:
1264 $(cmd_crmodverdir)
1265
1266PHONY += $(objtree)/Module.symvers
1267$(objtree)/Module.symvers:
1268 @test -e $(objtree)/Module.symvers || ( \
1269 echo; \
1270 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1271 echo " is missing; modules will have no dependencies and modversions."; \
1272 echo )
1273
1274module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1275PHONY += $(module-dirs) modules
1276$(module-dirs): crmodverdir $(objtree)/Module.symvers
1277 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1278
1279modules: $(module-dirs)
1280 @echo ' Building modules, stage 2.';
1281 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1282
1283PHONY += modules_install
1284modules_install: _emodinst_ _emodinst_post
1285
1286install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1287PHONY += _emodinst_
1288_emodinst_:
1289 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1290 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1291
1292PHONY += _emodinst_post
1293_emodinst_post: _emodinst_
1294 $(call cmd,depmod)
1295
1296clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1297
1298PHONY += $(clean-dirs) clean
1299$(clean-dirs):
1300 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1301
1302clean: rm-dirs := $(MODVERDIR)
1303clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1304clean: $(clean-dirs)
1305 $(call cmd,rmdirs)
1306 $(call cmd,rmfiles)
1307 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1308 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1309 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1310 -type f -print | xargs rm -f
1311
1312help:
1313 @echo ' Building external modules.'
1314 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1315 @echo ''
1316 @echo ' modules - default target, build the module(s)'
1317 @echo ' modules_install - install the module'
1318 @echo ' clean - remove generated files in module directory only'
1319 @echo ''
1320
1321# Dummies...
1322PHONY += prepare scripts
1323prepare: ;
1324scripts: ;
1325endif # KBUILD_EXTMOD
1326
1327# Generate tags for editors
1328# ---------------------------------------------------------------------------
1329
1330#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1331#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1332#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1333
1334ifeq ($(src),$(obj))
1335__srctree =
1336else
1337__srctree = $(srctree)/
1338endif
1339
1340ifeq ($(ALLSOURCE_ARCHS),)
1341ifeq ($(ARCH),um)
1342ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1343else
1344ALLINCLUDE_ARCHS := $(SRCARCH)
1345endif
1346else
1347#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1348ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1349endif
1350
1351ALLSOURCE_ARCHS := $(SRCARCH)
1352
1353define find-sources
1354 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1355 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1356 -name $1 -print; \
1357 done ; \
1358 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1359 -name $1 -print; \
1360 find $(__srctree)include $(RCS_FIND_IGNORE) \
1361 \( -name config -o -name 'asm-*' \) -prune \
1362 -o -name $1 -print; \
1363 for arch in $(ALLINCLUDE_ARCHS) ; do \
1364 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1365 -name $1 -print; \
1366 done ; \
1367 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1368 -name $1 -print; \
1369 find $(__srctree) $(RCS_FIND_IGNORE) \
1370 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1371 -name $1 -print; \
1372 )
1373endef
1374
1375define all-sources
1376 $(call find-sources,'*.[chS]')
1377endef
1378define all-kconfigs
1379 $(call find-sources,'Kconfig*')
1380endef
1381define all-defconfigs
1382 $(call find-sources,'defconfig')
1383endef
1384
1385define xtags
1386 if $1 --version 2>&1 | grep -iq exuberant; then \
1387 $(all-sources) | xargs $1 -a \
1388 -I __initdata,__exitdata,__acquires,__releases \
1389 -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1390 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1391 --extra=+f --c-kinds=+px \
1392 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1393 $(all-kconfigs) | xargs $1 -a \
1394 --langdef=kconfig \
1395 --language-force=kconfig \
1396 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1397 $(all-defconfigs) | xargs -r $1 -a \
1398 --langdef=dotconfig \
1399 --language-force=dotconfig \
1400 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1401 elif $1 --version 2>&1 | grep -iq emacs; then \
1402 $(all-sources) | xargs $1 -a; \
1403 $(all-kconfigs) | xargs $1 -a \
1404 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1405 $(all-defconfigs) | xargs -r $1 -a \
1406 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1407 else \
1408 $(all-sources) | xargs $1 -a; \
1409 fi
1410endef
1411
1412quiet_cmd_cscope-file = FILELST cscope.files
1413 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1414
1415quiet_cmd_cscope = MAKE cscope.out
1416 cmd_cscope = cscope -b
1417
1418cscope: FORCE
1419 $(call cmd,cscope-file)
1420 $(call cmd,cscope)
1421
1422quiet_cmd_TAGS = MAKE $@
1423define cmd_TAGS
1424 rm -f $@; \
1425 $(call xtags,etags)
1426endef
1427
1428TAGS: FORCE
1429 $(call cmd,TAGS)
1430
1431quiet_cmd_tags = MAKE $@
1432define cmd_tags
1433 rm -f $@; \
1434 $(call xtags,ctags)
1435endef
1436
1437tags: FORCE
1438 $(call cmd,tags)
1439
1440
1441# Scripts to check various things for consistency
1442# ---------------------------------------------------------------------------
1443
1444includecheck:
1445 find * $(RCS_FIND_IGNORE) \
1446 -name '*.[hcS]' -type f -print | sort \
1447 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1448
1449versioncheck:
1450 find * $(RCS_FIND_IGNORE) \
1451 -name '*.[hcS]' -type f -print | sort \
1452 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1453
1454namespacecheck:
1455 $(PERL) $(srctree)/scripts/namespace.pl
1456
1457export_report:
1458 $(PERL) $(srctree)/scripts/export_report.pl
1459
1460endif #ifeq ($(config-targets),1)
1461endif #ifeq ($(mixed-targets),1)
1462
1463PHONY += checkstack kernelrelease kernelversion
1464
1465# UML needs a little special treatment here. It wants to use the host
1466# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1467# else wants $(ARCH), including people doing cross-builds, which means
1468# that $(SUBARCH) doesn't work here.
1469ifeq ($(ARCH), um)
1470CHECKSTACK_ARCH := $(SUBARCH)
1471else
1472CHECKSTACK_ARCH := $(ARCH)
1473endif
1474checkstack:
1475 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1476 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1477
1478kernelrelease:
1479 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1480 $(error kernelrelease not valid - run 'make prepare' to update it))
1481kernelversion:
1482 @echo $(KERNELVERSION)
1483
1484# Single targets
1485# ---------------------------------------------------------------------------
1486# Single targets are compatible with:
1487# - build with mixed source and output
1488# - build with separate output dir 'make O=...'
1489# - external modules
1490#
1491# target-dir => where to store outputfile
1492# build-dir => directory in kernel source tree to use
1493
1494ifeq ($(KBUILD_EXTMOD),)
1495 build-dir = $(patsubst %/,%,$(dir $@))
1496 target-dir = $(dir $@)
1497else
1498 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1499 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1500 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1501endif
1502
1503%.s: %.c prepare scripts FORCE
1504 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1505%.i: %.c prepare scripts FORCE
1506 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1507%.o: %.c prepare scripts FORCE
1508 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1509%.lst: %.c prepare scripts FORCE
1510 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1511%.s: %.S prepare scripts FORCE
1512 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1513%.o: %.S prepare scripts FORCE
1514 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1515%.symtypes: %.c prepare scripts FORCE
1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517
1518# Modules
1519/ %/: prepare scripts FORCE
1520 $(cmd_crmodverdir)
1521 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1522 $(build)=$(build-dir)
1523%.ko: prepare scripts FORCE
1524 $(cmd_crmodverdir)
1525 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1526 $(build)=$(build-dir) $(@:.ko=.o)
1527 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1528
1529# FIXME Should go into a make.lib or something
1530# ===========================================================================
1531
1532quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1533 cmd_rmdirs = rm -rf $(rm-dirs)
1534
1535quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1536 cmd_rmfiles = rm -f $(rm-files)
1537
1538# Run depmod only is we have System.map and depmod is executable
1539# and we build for the host arch
1540quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1541 cmd_depmod = \
1542 if [ -r System.map -a -x $(DEPMOD) ]; then \
1543 $(DEPMOD) -ae -F System.map \
1544 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1545 $(KERNELRELEASE); \
1546 fi
1547
1548# Create temporary dir for module support files
1549# clean it up only when building all modules
1550cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1551 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1552
1553a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1554 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1555 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1556
1557quiet_cmd_as_o_S = AS $@
1558cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1559
1560# read all saved command lines
1561
1562targets := $(wildcard $(sort $(targets)))
1563cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1564
1565ifneq ($(cmd_files),)
1566 $(cmd_files): ; # Do not try to update included dependency files
1567 include $(cmd_files)
1568endif
1569
1570# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1571# Usage:
1572# $(Q)$(MAKE) $(clean)=dir
1573clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1574
1575endif # skip-makefile
1576
1577PHONY += FORCE
1578FORCE:
1579
1580# Declare the contents of the .PHONY variable as phony. We keep that
1581# information in a variable se we can use it in if_changed and friends.
1582.PHONY: $(PHONY)