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mm: slub: work around unneeded lockdep warning 

The slub code does some setup during early boot in
early_kmem_cache_node_alloc() with some local data.  There is no
possible way that another CPU can see this data, so the slub code
doesn't unnecessarily lock it.  However, some new lockdep asserts
check to make sure that add_partial() _always_ has the list_lock
held.

Just add the locking, even though it is technically unnecessary.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Dave Hansen 2014-01-24 07:20:23 -08:00 committed by Pekka Enberg
parent 433a91ff5f
commit 67b6c900dc
1 changed files with 6 additions and 0 deletions
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6
mm/slub.c
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@ -2890,7 +2890,13 @@ static void early_kmem_cache_node_alloc(int node)
init_kmem_cache_node(n);
inc_slabs_node(kmem_cache_node, node, page->objects);
/*
* the lock is for lockdep's sake, not for any actual
* race protection
*/
spin_lock(&n->list_lock);
add_partial(n, page, DEACTIVATE_TO_HEAD);
spin_unlock(&n->list_lock);
}
static void free_kmem_cache_nodes(struct kmem_cache *s)