From: Gavin Shan <shangw@linux.vnet.ibm.com>
Date: Tue, 31 Jul 2012 23:46:02 +0000 (-0700)
Subject: mm/sparse: optimize sparse_index_alloc
X-Git-Tag: v3.6-rc1~24^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b760e64a64c8940cdccd0ba6fce19a9bd010d20;p=pandora-kernel.git

mm/sparse: optimize sparse_index_alloc

With CONFIG_SPARSEMEM_EXTREME, the two levels of memory section
descriptors are allocated from slab or bootmem.  When allocating from
slab, let slab/bootmem allocator clear the memory chunk.  We needn't clear
it explicitly.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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