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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-08-15 12:45:09 -0400
committerH. Peter Anvin <hpa@zytor.com>2008-08-15 12:49:45 -0700
commit1f49a2c2aeb22d5abc6d4ea574ff63d37ca55fbe (patch)
treed559e223017b1c39ccaea3056ae3af0e62635509 /arch/x86/oprofile
parentf88f07e0f0fd6376e081b10930d272a08fbf082f (diff)
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 <mathieu.desnoyers@polymtl.ca> CC: Linus Torvalds <torvalds@linux-foundation.org> CC: H. Peter Anvin <hpa@zytor.com> CC: Jeremy Fitzhardinge <jeremy@goop.org> CC: Roland McGrath <roland@redhat.com> CC: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> CC: Steven Rostedt <srostedt@redhat.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: Peter Zijlstra <peterz@infradead.org> CC: Andrew Morton <akpm@linux-foundation.org> CC: David Miller <davem@davemloft.net> CC: Ulrich Drepper <drepper@redhat.com> CC: Rusty Russell <rusty@rustcorp.com.au> CC: Gregory Haskins <ghaskins@novell.com> CC: Arnaldo Carvalho de Melo <acme@redhat.com> CC: "Luis Claudio R. Goncalves" <lclaudio@uudg.org> CC: Clark Williams <williams@redhat.com> CC: Christoph Lameter <cl@linux-foundation.org> CC: Andi Kleen <andi@firstfloor.org> CC: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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