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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2010-04-20 10:33:50 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-26 07:48:03 -0700 |
| commit | eabe8c241a9ecbc15a9d51e0bfc3dde1c27d8a65 (patch) | |
| tree | 617778ee9f9737d30f5129659d57b6a0ddccf9d5 | |
| parent | 0fa07b3f945860507361d53be4f9f948b06b401f (diff) | |
lockdep: fix incorrect percpu usage
The mainline kernel as of 2.6.34-rc5 is not affected by this problem because
commit 10fad5e46f6c7bdfb01b1a012380a38e3c6ab346 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 8e18257d29238311e82085152741f0c3aa18b74d
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>
| -rw-r--r-- | kernel/lockdep.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index c62ec14609b..493a0efbb86 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -600,9 +600,9 @@ 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; |