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lockdep: fix incorrect percpu usage

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The mainline kernel as of 2.6.34-rc5 is not affected by this problem because
commit 10fad5e46f fixed it by refactoring.

lockdep fix incorrect percpu usage

Should use per_cpu_ptr() to obfuscate the per cpu pointers (RELOC_HIDE is needed
for per cpu pointers).

git blame points to commit:

lockdep.c: commit 8e18257d29

But it's really just moving the code around. But it's enough to say that the
problems appeared before Jul 19 01:48:54 2007, which brings us back to 2.6.23.

It should be applied to stable 2.6.23.x to 2.6.33.x (or whichever of these
stable branches are still maintained).

(tested on 2.6.33.1 x86_64)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Randy Dunlap <randy.dunlap@oracle.com>
CC: Eric Dumazet <dada1@cosmosbay.com>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Tejun Heo <tj@kernel.org>
CC: Ingo Molnar <mingo@elte.hu>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>
CC: Greg Kroah-Hartman <gregkh@suse.de>
CC: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mathieu Desnoyers
2010-04-20 10:33:50 -04:00
committed by Greg Kroah-Hartman
parent ea0a09acd8
commit b6b3dcd55e
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
kernel/lockdep.c
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@@ -591,9 +591,9 @@ static int static_obj(void *obj)
* percpu var?
*/
for_each_possible_cpu(i) {
start = (unsigned long) &__per_cpu_start + per_cpu_offset(i);
end = (unsigned long) &__per_cpu_start + PERCPU_ENOUGH_ROOM
+ per_cpu_offset(i);
start = (unsigned long) per_cpu_ptr(&__per_cpu_start, i);
end = (unsigned long) per_cpu_ptr(&__per_cpu_start, i)
+ PERCPU_ENOUGH_ROOM;
if ((addr >= start) && (addr < end))
return 1;