powerpc: Optimise smp_rmb

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After commit 598056d5af ("[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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Nick Piggin 2008-11-11 17:51:18 +00:00 • committed by Paul Mackerras

parent 46d075be58

commit 957ab07b44

1 changed files with 11 additions and 9 deletions

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arch/powerpc/include/asm/system.h

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