Commit-ID: 0ee3b6f87d4d748d5362cb47ff33fa1553805cb4
Gitweb: http://git.kernel.org/tip/0ee3b6f87d4d748d5362cb47ff33fa1553805cb4
Author: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
AuthorDate: Sat, 14 Dec 2013 14:25:03 +0800
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Mon, 16 Dec 2013 09:08:13 -0800
x86: replace futex_atomic_cmpxchg_inatomic() with user_atomic_cmpxchg_inatomic
futex_atomic_cmpxchg_inatomic() is simply the 32-bit implementation of
user_atomic_cmpxchg_inatomic(), which in turn is simply a
generalization of the original code in
futex_atomic_cmpxchg_inatomic().
Use the newly generalized user_atomic_cmpxchg_inatomic() as the futex
implementation, too.
[ hpa: retain the inline in futex.h rather than changing it to a macro ]
Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1387002303-6620-2-git-send-email-qiaowei.ren@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
arch/x86/include/asm/futex.h | 21 +--------------------
1 file changed, 1 insertion(+), 20 deletions(-)
diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h
index be27ba1..b4c1f54 100644
--- a/arch/x86/include/asm/futex.h
+++ b/arch/x86/include/asm/futex.h
@@ -110,26 +110,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
- int ret = 0;
-
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
- return -EFAULT;
-
- asm volatile("\t" ASM_STAC "\n"
- "1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"
- "2:\t" ASM_CLAC "\n"
- "\t.section .fixup, \"ax\"\n"
- "3:\tmov %3, %0\n"
- "\tjmp 2b\n"
- "\t.previous\n"
- _ASM_EXTABLE(1b, 3b)
- : "+r" (ret), "=a" (oldval), "+m" (*uaddr)
- : "i" (-EFAULT), "r" (newval), "1" (oldval)
- : "memory"
- );
-
- *uval = oldval;
- return ret;
+ return user_atomic_cmpxchg_inatomic(uval, uaddr, oldval, newval);
}
#endif
--
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