Commit 67b6c900 authored Jan 24, 2014 by Dave Hansen Committed by Pekka Enberg Jan 31, 2014

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>

parent 433a91ff

mm/slub.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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)

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