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From: Greg KH on 22 Apr 2010 16:10
2.6.33-stable review patch. If anyone has any objections, please let us know.

------------------

From: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com>

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(a)efficios.com>
CC: Randy Dunlap <randy.dunlap(a)oracle.com>
CC: Eric Dumazet <dada1(a)cosmosbay.com>
CC: Rusty Russell <rusty(a)rustcorp.com.au>
CC: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
CC: Tejun Heo <tj(a)kernel.org>
CC: Ingo Molnar <mingo(a)elte.hu>
CC: Andrew Morton <akpm(a)linux-foundation.org>
CC: Linus Torvalds <torvalds(a)linux-foundation.org>
CC: Greg Kroah-Hartman <gregkh(a)suse.de>
CC: Steven Rostedt <rostedt(a)goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
kernel/lockdep.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- 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
+ + PERCPU_ENOUGH_ROOM, i);

if ((addr >= start) && (addr < end))
return 1;


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