* [PATCH] m68knommu: fix compare race in sched related code
@ 2008-05-01 2:17 Greg Ungerer
0 siblings, 0 replies; only message in thread
From: Greg Ungerer @ 2008-05-01 2:17 UTC (permalink / raw)
To: torvalds; +Cc: akpm, gerg, linux-kernel
From: Sebastian Siewior <bigeasy@linutronix.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@linutronix.de>
Signed-off-by: Greg Ungerer <gerg@uclinux.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
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