x86: revert replace LOCK_PREFIX in futex.h

Since we now use DS prefixes instead of NOP to remove LOCK prefixes,
there are no longer any issues with instruction boundaries moving around.

Depends on :

x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug

On Thu, 14 Aug 2008, Mathieu Desnoyers wrote:
>
> Changing the 0x90 (single-byte nop) currently used into a 0x3E DS segment
> override prefix should fix this issue. Since the default of the atomic
> instructions is to use the DS segment anyway, it should not affect the
> behavior.

Ok, so I think this is an _excellent_ patch, but I'd like to also then use
LOCK_PREFIX in include/asm-x86/futex.h.

See commit 9d55b99.

                Linus

Applies to 2.6.27-rc2 (and -rc3 unless hell broke loose in futex.h between rc2
and rc3).

Signed-off-by: Mathieu Desnoyers <[email protected]>
CC: Linus Torvalds <[email protected]>
CC: H. Peter Anvin <[email protected]>
CC: Jeremy Fitzhardinge <[email protected]>
CC: Roland McGrath <[email protected]>
CC: Ingo Molnar <[email protected]>
Cc: Steven Rostedt <[email protected]>
CC: Steven Rostedt <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Peter Zijlstra <[email protected]>
CC: Andrew Morton <[email protected]>
CC: David Miller <[email protected]>
CC: Ulrich Drepper <[email protected]>
CC: Rusty Russell <[email protected]>
CC: Gregory Haskins <[email protected]>
CC: Arnaldo Carvalho de Melo <[email protected]>
CC: "Luis Claudio R. Goncalves" <[email protected]>
CC: Clark Williams <[email protected]>
CC: Christoph Lameter <[email protected]>
CC: Andi Kleen <[email protected]>
CC: Harvey Harrison <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>

Author: Mathieu Desnoyers

include/asm-x86/futex.h

@@ -25,7 +25,7 @@
 	asm volatile("1:\tmovl	%2, %0\n"			\
 		     "\tmovl\t%0, %3\n"				\
 		     "\t" insn "\n"				\
-		     "2:\tlock; cmpxchgl %3, %2\n"		\
+		     "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n"	\
 		     "\tjnz\t1b\n"				\
 		     "3:\t.section .fixup,\"ax\"\n"		\
 		     "4:\tmov\t%5, %1\n"			\
@@ -64,7 +64,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
 		__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
 		break;
 	case FUTEX_OP_ADD:
-		__futex_atomic_op1("lock; xaddl %0, %2", ret, oldval,
+		__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
 				   uaddr, oparg);
 		break;
 	case FUTEX_OP_OR:
@@ -122,7 +122,7 @@ static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval,
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
 		return -EFAULT;
 
-	asm volatile("1:\tlock; cmpxchgl %3, %1\n"
+	asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %3, %1\n"
 		     "2:\t.section .fixup, \"ax\"\n"
 		     "3:\tmov     %2, %0\n"
 		     "\tjmp     2b\n"