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 9d55b9923a1b7ea8193b8875c57ec940dc2ff027.

                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]>

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