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authorJan Beulich <JBeulich@suse.com>2012-01-02 17:02:18 +0000
committerIngo Molnar <mingo@elte.hu>2012-01-04 15:01:54 +0100
commitcdcd629869fabcd38ebd24a03b0a05ec1cbcafb0 (patch)
tree461087dd5b3d310a7da25021cb4f58270cbb7177 /mm/slub.c
parentadaf4ed2abbd285c93808060924eeec3af483aee (diff)
x86: Fix and improve cmpxchg_double{,_local}()
Just like the per-CPU ones they had several problems/shortcomings: Only the first memory operand was mentioned in the asm() operands, and the 2x64-bit version didn't have a memory clobber while the 2x32-bit one did. The former allowed the compiler to not recognize the need to re-load the data in case it had it cached in some register, while the latter was overly destructive. The types of the local copies of the old and new values were incorrect (the types of the pointed-to variables should be used here, to make sure the respective old/new variable types are compatible). The __dummy/__junk variables were pointless, given that local copies of the inputs already existed (and can hence be used for discarded outputs). The 32-bit variant of cmpxchg_double_local() referenced cmpxchg16b_local(). At once also: - change the return value type to what it really is: 'bool' - unify 32- and 64-bit variants - abstract out the common part of the 'normal' and 'local' variants Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: Christoph Lameter <cl@linux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/4F01F12A020000780006A19B@nat28.tlf.novell.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c
index ed3334d9b6da..09ccee8fb58e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -368,7 +368,7 @@ static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page
VM_BUG_ON(!irqs_disabled());
#ifdef CONFIG_CMPXCHG_DOUBLE
if (s->flags & __CMPXCHG_DOUBLE) {
- if (cmpxchg_double(&page->freelist,
+ if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
freelist_new, counters_new))
return 1;
@@ -402,7 +402,7 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
{
#ifdef CONFIG_CMPXCHG_DOUBLE
if (s->flags & __CMPXCHG_DOUBLE) {
- if (cmpxchg_double(&page->freelist,
+ if (cmpxchg_double(&page->freelist, &page->counters,
freelist_old, counters_old,
freelist_new, counters_new))
return 1;