From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 25 Dec 2007 04:57:56 +0000 (-0800)
Subject: [SOCK] Avoid divides in sk_stream_pages() and __sk_stream_mem_reclaim()
X-Git-Tag: v2.6.25-rc1~1162^2~919
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21371f768bf7127ee45bfaadd17899df6a439e8f;p=pandora-kernel.git

[SOCK] Avoid divides in sk_stream_pages() and __sk_stream_mem_reclaim()

sk_forward_alloc being signed, we should take care of divides by
SK_STREAM_MEM_QUANTUM we do in sk_stream_pages() and
__sk_stream_mem_reclaim()

This patchs introduces SK_STREAM_MEM_QUANTUM_SHIFT, defined
as ilog2(SK_STREAM_MEM_QUANTUM), to be able to use right
shifts instead of plain divides.

This should help compiler to choose right shifts instead of
expensive divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on x86)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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