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From: Mathieu Desnoyers on 29 Mar 2010 23:40
Should use per_cpu_ptr() to obfuscate the per cpu pointers (RELOC_HIDE is needed
for per cpu pointers).

Introduced by commit:

module.c: commit 6b588c18f8dacfa6d7957c33c5ff832096e752d3

This patch should be queued for the stable branch, for kernels 2.6.29.x to
2.6.33.x.
(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>
CC: stable <stable(a)kernel.org>
---
kernel/module.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6-lttng/kernel/module.c
===================================================================
--- linux-2.6-lttng.orig/kernel/module.c 2010-03-29 23:47:05.000000000 -0400
+++ linux-2.6-lttng/kernel/module.c 2010-03-29 23:47:27.000000000 -0400
@@ -412,7 +412,7 @@ static void percpu_modcopy(void *pcpudes
int cpu;

for_each_possible_cpu(cpu)
- memcpy(pcpudest + per_cpu_offset(cpu), from, size);
+ memcpy(per_cpu_ptr(pcpudest, cpu), from, size);
}

#else /* ... !CONFIG_SMP */

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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