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slab, lockdep: Annotate the locks before using them 

Fernando found we hit the regular OFF_SLAB 'recursion' before we
annotate the locks, cure this.

The relevant portion of the stack-trace:

> [    0.000000]  [<c085e24f>] rt_spin_lock+0x50/0x56
> [    0.000000]  [<c04fb406>] __cache_free+0x43/0xc3
> [    0.000000]  [<c04fb23f>] kmem_cache_free+0x6c/0xdc
> [    0.000000]  [<c04fb2fe>] slab_destroy+0x4f/0x53
> [    0.000000]  [<c04fb396>] free_block+0x94/0xc1
> [    0.000000]  [<c04fc551>] do_tune_cpucache+0x10b/0x2bb
> [    0.000000]  [<c04fc8dc>] enable_cpucache+0x7b/0xa7
> [    0.000000]  [<c0bd9d3c>] kmem_cache_init_late+0x1f/0x61
> [    0.000000]  [<c0bba687>] start_kernel+0x24c/0x363
> [    0.000000]  [<c0bba0ba>] i386_start_kernel+0xa9/0xaf

Reported-by: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1311888176.2617.379.camel@laptop
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-07-28 23:22:56 +02:00 committed by Ingo Molnar
parent f59de8992a
commit 30765b92ad
1 changed files with 3 additions and 3 deletions
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6
mm/slab.c
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@ -1666,6 +1666,9 @@ void __init kmem_cache_init_late(void)
{
struct kmem_cache *cachep;
/* Annotate slab for lockdep -- annotate the malloc caches */
init_lock_keys();
/* 6) resize the head arrays to their final sizes */
mutex_lock(&cache_chain_mutex);
list_for_each_entry(cachep, &cache_chain, next)
@ -1676,9 +1679,6 @@ void __init kmem_cache_init_late(void)
/* Done! */
g_cpucache_up = FULL;
/* Annotate slab for lockdep -- annotate the malloc caches */
init_lock_keys();
/*
* Register a cpu startup notifier callback that initializes
* cpu_cache_get for all new cpus