| commit | 957ab07b44d839ee8267e827fc4e8f1853798f57 | [log] [tgz] |
|---|---|---|
| author | Nick Piggin <npiggin@suse.de> | Tue Nov 11 17:51:18 2008 +0000 |
| committer | Paul Mackerras <paulus@samba.org> | Wed Nov 19 16:04:57 2008 +1100 |
| tree | d282112a07dfc82dfc44522ad9e5a0baffdd6888 | |
| parent | 46d075be585eae2b74265e4e64ca38dde16a09c6 [diff] |
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>