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Date: Thu, 1 May 2008 12:17:49 +1000 From: Greg Ungerer <gerg@...pgear.com> To: torvalds@...ux-foundation.org Cc: akpm@...ux-foundation.org, gerg@...inux.org, linux-kernel@...r.kernel.org Subject: [PATCH] m68knommu: fix compare race in sched related code From: Sebastian Siewior <bigeasy@...utronix.de> The interrupts must be disabled before considering the need resched bit of the task struct and they have to be disabled before calling schedule() Signed-off-by: Sebastian Siewior <bigeasy@...utronix.de> Signed-off-by: Greg Ungerer <gerg@...inux.org> --- diff -Naurp linux-2.6.25/arch/m68knommu/platform/coldfire/entry.S linux-2.6.25-uc0/arch/m68knommu/platform/coldfire/entry.S --- linux-2.6.25/arch/m68knommu/platform/coldfire/entry.S 2008-04-17 12:49:44.000000000 +1000 +++ linux-2.6.25-uc0/arch/m68knommu/platform/coldfire/entry.S 2008-04-29 14:26:11.000000000 +1000 @@ -103,6 +103,7 @@ ret_from_signal: addql #4,%sp ret_from_exception: + move #0x2700,%sr /* disable intrs */ btst #5,%sp@(PT_SR) /* check if returning to kernel */ jeq Luser_return /* if so, skip resched, signals */ @@ -140,6 +141,7 @@ Lreturn: Lwork_to_do: movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */ + move #0x2000,%sr /* enable intrs again */ btst #TIF_NEED_RESCHED,%d1 jne reschedule -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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