Patch to stop backtrace on 2.6.20-rt8

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Ingo,

This patch fixes a backtrace I get when disconnecting USB storage devices (well ok, my iPod :)):

index 8761f4f..948007e 100644

- --- a/mm/slab.c
+++ b/mm/slab.c
@@ -4121,7 +4121,7 @@ static int enable_cpucache(struct kmem_cache *cachep)
int drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
struct array_cache *ac, int force, int node)
{
- - int this_cpu = smp_processor_id();

+       int this_cpu = raw_smp_processor_id();
        int tofree;

        if (!ac || !ac->avail)

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