Marker depmod fix core kernel list

87f3b6b6 · Mathieu Desnoyers <[email protected]> · 2008-10-06 09:30:12 -04:00

* Theodore Ts'o ([email protected]) wrote:
>
> I've been playing with adding some markers into ext4 to see if they
> could be useful in solving some problems along with Systemtap.  It
> appears, though, that as of 2.6.27-rc8, markers defined in code which is
> compiled directly into the kernel (i.e., not as modules) don't show up
> in Module.markers:
>
> kvm_trace_entryexit arch/x86/kvm/kvm-intel  %u %p %u %u %u %u %u %u
> kvm_trace_handler arch/x86/kvm/kvm-intel  %u %p %u %u %u %u %u %u
> kvm_trace_entryexit arch/x86/kvm/kvm-amd  %u %p %u %u %u %u %u %u
> kvm_trace_handler arch/x86/kvm/kvm-amd  %u %p %u %u %u %u %u %u
>
> (Note the lack of any of the kernel_sched_* markers, and the markers I
> added for ext4_* and jbd2_* are missing as wel.)
>
> Systemtap apparently depends on in-kernel trace_mark being recorded in
> Module.markers, and apparently it's been claimed that it used to be
> there.  Is this a bug in systemtap, or in how Module.markers is getting
> built?   And is there a file that contains the equivalent information
> for markers located in non-modules code?

I think the problem comes from "markers: fix duplicate modpost entry"
(commit d35cb360c29956510b2fe1a953bd4968536f7216)

Especially :

  -   add_marker(mod, marker, fmt);
  +   if (!mod->skip)
  +     add_marker(mod, marker, fmt);
    }
    return;
   fail:

Here is a fix that should take care if this problem.

Thanks for the bug report!

Signed-off-by: Mathieu Desnoyers <[email protected]>
Tested-by: "Theodore Ts'o" <[email protected]>
CC: Greg KH <[email protected]>
CC: David Smith <[email protected]>
CC: Roland McGrath <[email protected]>
CC: Sam Ravnborg <[email protected]>
CC: Wenji Huang <[email protected]>
CC: Takashi Nishiie <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 87f3b6b6fbcbfa715f0d0db3e7a63e65716a6d4e
Parents: afed26d1

Changes

1 files changed · +4 −2

File	Status	Add	Del	Content
scripts/mod/modpost.c	modified	+4	−2	View file

scripts/mod/modpost.c

View file

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 418cd7d..8e0de6a 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1986,11 +1986,13 @@ static void read_markers(const char *fname)
 
 		mod = find_module(modname);
 		if (!mod) {
-			if (is_vmlinux(modname))
-				have_vmlinux = 1;
 			mod = new_module(NOFAIL(strdup(modname)));
 			mod->skip = 1;
 		}
+		if (is_vmlinux(modname)) {
+			have_vmlinux = 1;
+			mod->skip = 0;
+		}
 
 		if (!mod->skip)
 			add_marker(mod, marker, fmt);