Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1b0b3b9980e482ab7c603430462538334f69f14a
Commit: 1b0b3b9980e482ab7c603430462538334f69f14a
Parent: 74e9f5fa1570f956c96dd5d3f1053daedbbf01a0
Author: Oliver Neukum <[EMAIL PROTECTED]>
AuthorDate: Mon Apr 2 14:47:59 2007 +0200
Committer: Greg Kroah-Hartman <[EMAIL PROTECTED]>
CommitDate: Fri Apr 27 10:57:29 2007 -0700
kref: fix CPU ordering with respect to krefs
some atomic operations are only atomic, not ordered. Thus a CPU is allowed
to reorder memory references to an object to before the reference is
obtained. This fixes it.
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
lib/kref.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/lib/kref.c b/lib/kref.c
index 0d07cc3..a6dc3ec 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -21,6 +21,7 @@
void kref_init(struct kref *kref)
{
atomic_set(&kref->refcount,1);
+ smp_mb();
}
/**
@@ -31,6 +32,7 @@ void kref_get(struct kref *kref)
{
WARN_ON(!atomic_read(&kref->refcount));
atomic_inc(&kref->refcount);
+ smp_mb__after_atomic_inc();
}
/**
-
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