[PATCH] use smp_mb/wmb/rmb where possible

Replace a number of memory barriers with smp_ variants.  This means we won't
take the unnecessary hit on UP machines.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 88b306c4e841..f5cc1cec0fb4 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -135,7 +135,7 @@ int ptrace_attach(struct task_struct *task)
             (current->gid != task->sgid) ||
             (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
                 goto bad;
-        rmb();
+        smp_rmb();
         if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE))
                 goto bad;
         /* the same process cannot be attached many times */