From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 21 Nov 2008 04:39:09 +0000 (-0800)
Subject: net: convert TCP/DCCP ehash rwlocks to spinlocks
X-Git-Tag: v2.6.29-rc1~581^2~606
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9db66bdcc83749affe61c61eb8ff3cf08f42afec;p=pandora-kernel.git

net: convert TCP/DCCP ehash rwlocks to spinlocks

Now TCP & DCCP use RCU lookups, we can convert ehash rwlocks to spinlocks.

/proc/net/tcp and other seq_file 'readers' can safely be converted to 'writers'.

This should speedup writers, since spin_lock()/spin_unlock()
only use one atomic operation instead of two for write_lock()/write_unlock()

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