aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorSebastian Siewior <bigeasy@linutronix.de>2008-05-01 12:16:29 +1000
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-01 08:08:35 -0700
commita19325a77432338d2710b3ebbe7fd8e6627e81e3 (patch)
treeda28058ae14e32e2aeaebffd3c2eba2b31a7adda /arch
parent2d7f16d6d12682c41fb287ea8261df8e4679f638 (diff)
downloadlinux-linaro-a19325a77432338d2710b3ebbe7fd8e6627e81e3.tar.gz
m68knommu: ColdFire add support for kernel preemption
As the subject says this patch adds the support for kernel preemption on m68knommu Coldfire. I thing the same changes could be applied to 68360 & 68328 but since I don't have the HW for testing, I don't touch it. Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/m68knommu/kernel/asm-offsets.c1
-rw-r--r--arch/m68knommu/platform/coldfire/entry.S16
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/m68knommu/kernel/asm-offsets.c b/arch/m68knommu/kernel/asm-offsets.c
index fd0c685a7f1..c785d07c02c 100644
--- a/arch/m68knommu/kernel/asm-offsets.c
+++ b/arch/m68knommu/kernel/asm-offsets.c
@@ -87,6 +87,7 @@ int main(void)
DEFINE(TI_TASK, offsetof(struct thread_info, task));
DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain));
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+ DEFINE(TI_PREEMPTCOUNT, offsetof(struct thread_info, preempt_count));
DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
return 0;
diff --git a/arch/m68knommu/platform/coldfire/entry.S b/arch/m68knommu/platform/coldfire/entry.S
index 111b66dc737..1af7c1d650f 100644
--- a/arch/m68knommu/platform/coldfire/entry.S
+++ b/arch/m68knommu/platform/coldfire/entry.S
@@ -106,6 +106,22 @@ ret_from_exception:
btst #5,%sp@(PT_SR) /* check if returning to kernel */
jeq Luser_return /* if so, skip resched, signals */
+#ifdef CONFIG_PREEMPT
+ movel %sp,%d1 /* get thread_info pointer */
+ andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
+ movel %d1,%a0
+ movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
+ andl #_TIF_NEED_RESCHED,%d1
+ jeq Lkernel_return
+
+ movel %a0@(TI_PREEMPTCOUNT),%d1
+ cmpl #0,%d1
+ jne Lkernel_return
+
+ pea Lkernel_return
+ jmp preempt_schedule_irq /* preempt the kernel */
+#endif
+
Lkernel_return:
moveml %sp@,%d1-%d5/%a0-%a2
lea %sp@(32),%sp /* space for 8 regs */