The patch titled
futex: remove unneeded barrier
has been added to the -mm tree. Its filename is
futex-remove-unneeded-barrier.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: futex: remove unneeded barrier
From: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
When disassembling a kernel I found around over 90 sync Instructions from
mb, rmb and wmb calls in the kernel and only few of those make any sense to
me. So here's the first one - I think the wmb() in kernel/futex.c is not
needed on uniprocessors so should become an smb_wmb().
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/futex.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/futex.c~futex-remove-unneeded-barrier kernel/futex.c
--- a/kernel/futex.c~futex-remove-unneeded-barrier
+++ a/kernel/futex.c
@@ -553,7 +553,7 @@ static void wake_futex(struct futex_q *q
* at the end of wake_up_all() does not prevent this store from
* moving.
*/
- wmb();
+ smp_wmb();
q->lock_ptr = NULL;
}
_
Patches currently in -mm which might be from ralf@xxxxxxxxxxxxxx are
mips-dbg_io-stray-brackets-fix.patch
git-mtd.patch
declance-fix-pmax-and-pmad-support.patch
declance-fix-pmax-and-pmad-support-fix.patch
declance-support-the-i-o-asic-lance-w-o-turbochannel.patch
git-net.patch
export-pm_suspend-for-the-shared-apm-emulation.patch
add-struct-dev-pointer-to-dma_is_consistent.patch
pass-struct-dev-pointer-to-dma_cache_sync.patch
futex-remove-unneeded-barrier.patch
generic-ioremap_page_range-mips-conversion.patch
-
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