Merge tag 'linux-kselftest-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
Merge commit. Changes below are compared with the first parent: 81ff5d2c.
Changes
35 files changed · +1081 −223
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Documentation/dev-tools/kselftest.rst
View filediff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
index 7756f7a..c8c0338 100644
--- a/Documentation/dev-tools/kselftest.rst
+++ b/Documentation/dev-tools/kselftest.rst
@@ -14,6 +14,10 @@ in safe mode with a limited scope. In limited mode, cpu-hotplug test is
run on a single cpu as opposed to all hotplug capable cpus, and memory
hotplug test is run on 2% of hotplug capable memory instead of 10%.
+kselftest runs as a userspace process. Tests that can be written/run in
+userspace may wish to use the `Test Harness`_. Tests that need to be
+run in kernel space may wish to use a `Test Module`_.
+
Running the selftests (hotplug tests are run in limited mode)
=============================================================
@@ -161,11 +165,97 @@ Contributing new tests (details)
e.g: tools/testing/selftests/android/config
+Test Module
+===========
+
+Kselftest tests the kernel from userspace. Sometimes things need
+testing from within the kernel, one method of doing this is to create a
+test module. We can tie the module into the kselftest framework by
+using a shell script test runner. ``kselftest_module.sh`` is designed
+to facilitate this process. There is also a header file provided to
+assist writing kernel modules that are for use with kselftest:
+
+- ``tools/testing/kselftest/kselftest_module.h``
+- ``tools/testing/kselftest/kselftest_module.sh``
+
+How to use
+----------
+
+Here we show the typical steps to create a test module and tie it into
+kselftest. We use kselftests for lib/ as an example.
+
+1. Create the test module
+
+2. Create the test script that will run (load/unload) the module
+ e.g. ``tools/testing/selftests/lib/printf.sh``
+
+3. Add line to config file e.g. ``tools/testing/selftests/lib/config``
+
+4. Add test script to makefile e.g. ``tools/testing/selftests/lib/Makefile``
+
+5. Verify it works:
+
+.. code-block:: sh
+
+ # Assumes you have booted a fresh build of this kernel tree
+ cd /path/to/linux/tree
+ make kselftest-merge
+ make modules
+ sudo make modules_install
+ make TARGETS=lib kselftest
+
+Example Module
+--------------
+
+A bare bones test module might look like this:
+
+.. code-block:: c
+
+ // SPDX-License-Identifier: GPL-2.0+
+
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+ #include "../tools/testing/selftests/kselftest_module.h"
+
+ KSTM_MODULE_GLOBALS();
+
+ /*
+ * Kernel module for testing the foobinator
+ */
+
+ static int __init test_function()
+ {
+ ...
+ }
+
+ static void __init selftest(void)
+ {
+ KSTM_CHECK_ZERO(do_test_case("", 0));
+ }
+
+ KSTM_MODULE_LOADERS(test_foo);
+ MODULE_AUTHOR("John Developer <[email protected]>");
+ MODULE_LICENSE("GPL");
+
+Example test script
+-------------------
+
+.. code-block:: sh
+
+ #!/bin/bash
+ # SPDX-License-Identifier: GPL-2.0+
+ $(dirname $0)/../kselftest_module.sh "foo" test_foo
+
+
Test Harness
============
-The kselftest_harness.h file contains useful helpers to build tests. The tests
-from tools/testing/selftests/seccomp/seccomp_bpf.c can be used as example.
+The kselftest_harness.h file contains useful helpers to build tests. The
+test harness is for userspace testing, for kernel space testing see `Test
+Module`_ above.
+
+The tests from tools/testing/selftests/seccomp/seccomp_bpf.c can be used as
+example.
Example
-------
include/linux/string.h
View filediff --git a/include/linux/string.h b/include/linux/string.h
index 6ab0a6f..4deb11f 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -31,6 +31,10 @@ size_t strlcpy(char *, const char *, size_t);
#ifndef __HAVE_ARCH_STRSCPY
ssize_t strscpy(char *, const char *, size_t);
#endif
+
+/* Wraps calls to strscpy()/memset(), no arch specific code required */
+ssize_t strscpy_pad(char *dest, const char *src, size_t count);
+
#ifndef __HAVE_ARCH_STRCAT
extern char * strcat(char *, const char *);
#endif
lib/Kconfig.debug
View filediff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d5a4a40..4c54a89 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1769,6 +1769,9 @@ config TEST_HEXDUMP
config TEST_STRING_HELPERS
tristate "Test functions located in the string_helpers module at runtime"
+config TEST_STRSCPY
+ tristate "Test strscpy*() family of functions at runtime"
+
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"
lib/Makefile
View filediff --git a/lib/Makefile b/lib/Makefile
index e16e7aa..07506e3 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o
obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
+obj-$(CONFIG_TEST_STRSCPY) += test_strscpy.o
obj-$(CONFIG_TEST_BITFIELD) += test_bitfield.o
obj-$(CONFIG_TEST_UUID) += test_uuid.o
obj-$(CONFIG_TEST_XARRAY) += test_xarray.o
lib/string.c
View filediff --git a/lib/string.c b/lib/string.c
index 3ab861c..6016eb3 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -159,11 +159,9 @@ EXPORT_SYMBOL(strlcpy);
* @src: Where to copy the string from
* @count: Size of destination buffer
*
- * Copy the string, or as much of it as fits, into the dest buffer.
- * The routine returns the number of characters copied (not including
- * the trailing NUL) or -E2BIG if the destination buffer wasn't big enough.
- * The behavior is undefined if the string buffers overlap.
- * The destination buffer is always NUL terminated, unless it's zero-sized.
+ * Copy the string, or as much of it as fits, into the dest buffer. The
+ * behavior is undefined if the string buffers overlap. The destination
+ * buffer is always NUL terminated, unless it's zero-sized.
*
* Preferred to strlcpy() since the API doesn't require reading memory
* from the src string beyond the specified "count" bytes, and since
@@ -173,8 +171,10 @@ EXPORT_SYMBOL(strlcpy);
*
* Preferred to strncpy() since it always returns a valid string, and
* doesn't unnecessarily force the tail of the destination buffer to be
- * zeroed. If the zeroing is desired, it's likely cleaner to use strscpy()
- * with an overflow test, then just memset() the tail of the dest buffer.
+ * zeroed. If zeroing is desired please use strscpy_pad().
+ *
+ * Return: The number of characters copied (not including the trailing
+ * %NUL) or -E2BIG if the destination buffer wasn't big enough.
*/
ssize_t strscpy(char *dest, const char *src, size_t count)
{
@@ -237,6 +237,39 @@ ssize_t strscpy(char *dest, const char *src, size_t count)
EXPORT_SYMBOL(strscpy);
#endif
+/**
+ * strscpy_pad() - Copy a C-string into a sized buffer
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @count: Size of destination buffer
+ *
+ * Copy the string, or as much of it as fits, into the dest buffer. The
+ * behavior is undefined if the string buffers overlap. The destination
+ * buffer is always %NUL terminated, unless it's zero-sized.
+ *
+ * If the source string is shorter than the destination buffer, zeros
+ * the tail of the destination buffer.
+ *
+ * For full explanation of why you may want to consider using the
+ * 'strscpy' functions please see the function docstring for strscpy().
+ *
+ * Return: The number of characters copied (not including the trailing
+ * %NUL) or -E2BIG if the destination buffer wasn't big enough.
+ */
+ssize_t strscpy_pad(char *dest, const char *src, size_t count)
+{
+ ssize_t written;
+
+ written = strscpy(dest, src, count);
+ if (written < 0 || written == count - 1)
+ return written;
+
+ memset(dest + written + 1, 0, count - written - 1);
+
+ return written;
+}
+EXPORT_SYMBOL(strscpy_pad);
+
#ifndef __HAVE_ARCH_STRCAT
/**
* strcat - Append one %NUL-terminated string to another
lib/test_bitmap.c
View filediff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index 6cd7d07..792d906 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -12,6 +12,8 @@
#include <linux/slab.h>
#include <linux/string.h>
+#include "../tools/testing/selftests/kselftest_module.h"
+
static unsigned total_tests __initdata;
static unsigned failed_tests __initdata;
@@ -361,7 +363,7 @@ static void noinline __init test_mem_optimisations(void)
}
}
-static int __init test_bitmap_init(void)
+static void __init selftest(void)
{
test_zero_clear();
test_fill_set();
@@ -369,22 +371,8 @@ static int __init test_bitmap_init(void)
test_bitmap_arr32();
test_bitmap_parselist();
test_mem_optimisations();
-
- if (failed_tests == 0)
- pr_info("all %u tests passed\n", total_tests);
- else
- pr_warn("failed %u out of %u tests\n",
- failed_tests, total_tests);
-
- return failed_tests ? -EINVAL : 0;
}
-static void __exit test_bitmap_cleanup(void)
-{
-}
-
-module_init(test_bitmap_init);
-module_exit(test_bitmap_cleanup);
-
+KSTM_MODULE_LOADERS(test_bitmap);
MODULE_AUTHOR("david decotigny <[email protected]>");
MODULE_LICENSE("GPL");
lib/test_printf.c
View filediff --git a/lib/test_printf.c b/lib/test_printf.c
index 659b6cc..f4fcc1c 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -21,6 +21,8 @@
#include <linux/gfp.h>
#include <linux/mm.h>
+#include "../tools/testing/selftests/kselftest_module.h"
+
#define BUF_SIZE 256
#define PAD_SIZE 16
#define FILL_CHAR '$'
@@ -590,12 +592,11 @@ test_pointer(void)
flags();
}
-static int __init
-test_printf_init(void)
+static void __init selftest(void)
{
alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
if (!alloced_buffer)
- return -ENOMEM;
+ return;
test_buffer = alloced_buffer + PAD_SIZE;
test_basic();
@@ -604,16 +605,8 @@ test_printf_init(void)
test_pointer();
kfree(alloced_buffer);
-
- if (failed_tests == 0)
- pr_info("all %u tests passed\n", total_tests);
- else
- pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
-
- return failed_tests ? -EINVAL : 0;
}
-module_init(test_printf_init);
-
+KSTM_MODULE_LOADERS(test_printf);
MODULE_AUTHOR("Rasmus Villemoes <[email protected]>");
MODULE_LICENSE("GPL");
lib/test_strscpy.c
View filediff --git a/lib/test_strscpy.c b/lib/test_strscpy.c
new file mode 100644
index 0000000..a827f94
--- /dev/null
+++ b/lib/test_strscpy.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/string.h>
+
+#include "../tools/testing/selftests/kselftest_module.h"
+
+/*
+ * Kernel module for testing 'strscpy' family of functions.
+ */
+
+KSTM_MODULE_GLOBALS();
+
+/*
+ * tc() - Run a specific test case.
+ * @src: Source string, argument to strscpy_pad()
+ * @count: Size of destination buffer, argument to strscpy_pad()
+ * @expected: Expected return value from call to strscpy_pad()
+ * @terminator: 1 if there should be a terminating null byte 0 otherwise.
+ * @chars: Number of characters from the src string expected to be
+ * written to the dst buffer.
+ * @pad: Number of pad characters expected (in the tail of dst buffer).
+ * (@pad does not include the null terminator byte.)
+ *
+ * Calls strscpy_pad() and verifies the return value and state of the
+ * destination buffer after the call returns.
+ */
+static int __init tc(char *src, int count, int expected,
+ int chars, int terminator, int pad)
+{
+ int nr_bytes_poison;
+ int max_expected;
+ int max_count;
+ int written;
+ char buf[6];
+ int index, i;
+ const char POISON = 'z';
+
+ total_tests++;
+
+ if (!src) {
+ pr_err("null source string not supported\n");
+ return -1;
+ }
+
+ memset(buf, POISON, sizeof(buf));
+ /* Future proofing test suite, validate args */
+ max_count = sizeof(buf) - 2; /* Space for null and to verify overflow */
+ max_expected = count - 1; /* Space for the null */
+ if (count > max_count) {
+ pr_err("count (%d) is too big (%d) ... aborting", count, max_count);
+ return -1;
+ }
+ if (expected > max_expected) {
+ pr_warn("expected (%d) is bigger than can possibly be returned (%d)",
+ expected, max_expected);
+ }
+
+ written = strscpy_pad(buf, src, count);
+ if ((written) != (expected)) {
+ pr_err("%d != %d (written, expected)\n", written, expected);
+ goto fail;
+ }
+
+ if (count && written == -E2BIG) {
+ if (strncmp(buf, src, count - 1) != 0) {
+ pr_err("buffer state invalid for -E2BIG\n");
+ goto fail;
+ }
+ if (buf[count - 1] != '\0') {
+ pr_err("too big string is not null terminated correctly\n");
+ goto fail;
+ }
+ }
+
+ for (i = 0; i < chars; i++) {
+ if (buf[i] != src[i]) {
+ pr_err("buf[i]==%c != src[i]==%c\n", buf[i], src[i]);
+ goto fail;
+ }
+ }
+
+ if (terminator) {
+ if (buf[count - 1] != '\0') {
+ pr_err("string is not null terminated correctly\n");
+ goto fail;
+ }
+ }
+
+ for (i = 0; i < pad; i++) {
+ index = chars + terminator + i;
+ if (buf[index] != '\0') {
+ pr_err("padding missing at index: %d\n", i);
+ goto fail;
+ }
+ }
+
+ nr_bytes_poison = sizeof(buf) - chars - terminator - pad;
+ for (i = 0; i < nr_bytes_poison; i++) {
+ index = sizeof(buf) - 1 - i; /* Check from the end back */
+ if (buf[index] != POISON) {
+ pr_err("poison value missing at index: %d\n", i);
+ goto fail;
+ }
+ }
+
+ return 0;
+fail:
+ failed_tests++;
+ return -1;
+}
+
+static void __init selftest(void)
+{
+ /*
+ * tc() uses a destination buffer of size 6 and needs at
+ * least 2 characters spare (one for null and one to check for
+ * overflow). This means we should only call tc() with
+ * strings up to a maximum of 4 characters long and 'count'
+ * should not exceed 4. To test with longer strings increase
+ * the buffer size in tc().
+ */
+
+ /* tc(src, count, expected, chars, terminator, pad) */
+ KSTM_CHECK_ZERO(tc("a", 0, -E2BIG, 0, 0, 0));
+ KSTM_CHECK_ZERO(tc("", 0, -E2BIG, 0, 0, 0));
+
+ KSTM_CHECK_ZERO(tc("a", 1, -E2BIG, 0, 1, 0));
+ KSTM_CHECK_ZERO(tc("", 1, 0, 0, 1, 0));
+
+ KSTM_CHECK_ZERO(tc("ab", 2, -E2BIG, 1, 1, 0));
+ KSTM_CHECK_ZERO(tc("a", 2, 1, 1, 1, 0));
+ KSTM_CHECK_ZERO(tc("", 2, 0, 0, 1, 1));
+
+ KSTM_CHECK_ZERO(tc("abc", 3, -E2BIG, 2, 1, 0));
+ KSTM_CHECK_ZERO(tc("ab", 3, 2, 2, 1, 0));
+ KSTM_CHECK_ZERO(tc("a", 3, 1, 1, 1, 1));
+ KSTM_CHECK_ZERO(tc("", 3, 0, 0, 1, 2));
+
+ KSTM_CHECK_ZERO(tc("abcd", 4, -E2BIG, 3, 1, 0));
+ KSTM_CHECK_ZERO(tc("abc", 4, 3, 3, 1, 0));
+ KSTM_CHECK_ZERO(tc("ab", 4, 2, 2, 1, 1));
+ KSTM_CHECK_ZERO(tc("a", 4, 1, 1, 1, 2));
+ KSTM_CHECK_ZERO(tc("", 4, 0, 0, 1, 3));
+}
+
+KSTM_MODULE_LOADERS(test_strscpy);
+MODULE_AUTHOR("Tobin C. Harding <[email protected]>");
+MODULE_LICENSE("GPL");
tools/testing/selftests/Makefile
View filediff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 971fc84..f2ebf8c 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -15,11 +15,11 @@ TARGETS += firmware
TARGETS += ftrace
TARGETS += futex
TARGETS += gpio
-TARGETS += ima
TARGETS += intel_pstate
TARGETS += ipc
TARGETS += ir
TARGETS += kcmp
+TARGETS += kexec
TARGETS += kvm
TARGETS += lib
TARGETS += livepatch
@@ -75,12 +75,15 @@ ifneq ($(KBUILD_SRC),)
override LDFLAGS =
endif
-BUILD := $(O)
-ifndef BUILD
- BUILD := $(KBUILD_OUTPUT)
-endif
-ifndef BUILD
- BUILD := $(shell pwd)
+ifneq ($(O),)
+ BUILD := $(O)
+else
+ ifneq ($(KBUILD_OUTPUT),)
+ BUILD := $(KBUILD_OUTPUT)
+ else
+ BUILD := $(shell pwd)
+ DEFAULT_INSTALL_HDR_PATH := 1
+ endif
endif
# KSFT_TAP_LEVEL is used from KSFT framework to prevent nested TAP header
@@ -89,8 +92,50 @@ endif
# with system() call. Export it here to cover override RUN_TESTS defines.
export KSFT_TAP_LEVEL=`echo 1`
+# Prepare for headers install
+top_srcdir ?= ../../..
+include $(top_srcdir)/scripts/subarch.include
+ARCH ?= $(SUBARCH)
+export KSFT_KHDR_INSTALL_DONE := 1
export BUILD
-all:
+
+# build and run gpio when output directory is the src dir.
+# gpio has dependency on tools/gpio and builds tools/gpio
+# objects in the src directory in all cases making the src
+# repo dirty even when objects are relocated.
+ifneq (1,$(DEFAULT_INSTALL_HDR_PATH))
+ TMP := $(filter-out gpio, $(TARGETS))
+ TARGETS := $(TMP)
+endif
+
+# set default goal to all, so make without a target runs all, even when
+# all isn't the first target in the file.
+.DEFAULT_GOAL := all
+
+# Install headers here once for all tests. KSFT_KHDR_INSTALL_DONE
+# is used to avoid running headers_install from lib.mk.
+# Invoke headers install with --no-builtin-rules to avoid circular
+# dependency in "make kselftest" case. In this case, second level
+# make inherits builtin-rules which will use the rule generate
+# Makefile.o and runs into
+# "Circular Makefile.o <- prepare dependency dropped."
+# and headers_install fails and test compile fails.
+#
+# O= KBUILD_OUTPUT cases don't run into this error, since main Makefile
+# invokes them as sub-makes and --no-builtin-rules is not necessary,
+# but doesn't cause any failures. Keep it simple and use the same
+# flags in both cases.
+# Local build cases: "make kselftest", "make -C" - headers are installed
+# in the default INSTALL_HDR_PATH usr/include.
+khdr:
+ifeq (1,$(DEFAULT_INSTALL_HDR_PATH))
+ make --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install
+else
+ make --no-builtin-rules INSTALL_HDR_PATH=$$BUILD/usr \
+ ARCH=$(ARCH) -C $(top_srcdir) headers_install
+endif
+
+all: khdr
@for TARGET in $(TARGETS); do \
BUILD_TARGET=$$BUILD/$$TARGET; \
mkdir $$BUILD_TARGET -p; \
@@ -173,4 +218,4 @@ clean:
make OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
done;
-.PHONY: all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean
+.PHONY: khdr all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean
tools/testing/selftests/cgroup/test_memcontrol.c
View filediff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 28d321b..6f33988 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -26,7 +26,7 @@
*/
static int test_memcg_subtree_control(const char *root)
{
- char *parent, *child, *parent2, *child2;
+ char *parent, *child, *parent2 = NULL, *child2 = NULL;
int ret = KSFT_FAIL;
char buf[PAGE_SIZE];
@@ -34,50 +34,54 @@ static int test_memcg_subtree_control(const char *root)
parent = cg_name(root, "memcg_test_0");
child = cg_name(root, "memcg_test_0/memcg_test_1");
if (!parent || !child)
- goto cleanup;
+ goto cleanup_free;
if (cg_create(parent))
- goto cleanup;
+ goto cleanup_free;
if (cg_write(parent, "cgroup.subtree_control", "+memory"))
- goto cleanup;
+ goto cleanup_parent;
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tools/testing/selftests/efivarfs/efivarfs.sh
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tools/testing/selftests/gpio/gpio-mockup-chardev.c
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tools/testing/selftests/ima/config
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tools/testing/selftests/ima/test_kexec_load.sh
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tools/testing/selftests/ipc/msgque.c
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tools/testing/selftests/kexec/Makefile
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tools/testing/selftests/kexec/config
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tools/testing/selftests/kexec/kexec_common_lib.sh
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tools/testing/selftests/kexec/test_kexec_file_load.sh
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tools/testing/selftests/kselftest_harness.h
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tools/testing/selftests/kselftest_module.h
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tools/testing/selftests/kselftest_module.sh
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tools/testing/selftests/lib.mk
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tools/testing/selftests/lib/Makefile
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tools/testing/selftests/lib/bitmap.sh
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tools/testing/selftests/lib/config
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tools/testing/selftests/lib/prime_numbers.sh
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tools/testing/selftests/lib/printf.sh
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tools/testing/selftests/lib/strscpy.sh
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tools/testing/selftests/rseq/rseq.h
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tools/testing/selftests/rseq/run_param_test.sh
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tools/testing/selftests/seccomp/seccomp_bpf.c
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tools/testing/selftests/timers/skew_consistency.c
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tools/testing/selftests/x86/mpx-dig.c
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