From: Nick Piggin <npiggin@suse.de>
Date: Tue, 11 Nov 2008 17:51:18 +0000 (+0000)
Subject: powerpc: Optimise smp_rmb
X-Git-Tag: v2.6.29-rc1~574^2~115
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=957ab07b44d839ee8267e827fc4e8f1853798f57;p=pandora-kernel.git

powerpc: Optimise smp_rmb

After commit 598056d5af8fef1dbe8f96f5c2b641a528184e5a ("[POWERPC] Fix
rmb to order cacheable vs. noncacheable"), rmb() becomes a sync
instruction, which is needed to order cacheable vs noncacheable loads.
However smp_rmb() is #defined to rmb(), and smp_rmb() can be an
lwsync.

This restores smp_rmb() performance by using lwsync there and updates
the comments.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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