Commit a19325a7 authored by Sebastian Siewior's avatar Sebastian Siewior Committed by Linus Torvalds

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: default avatarSebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarGreg Ungerer <gerg@uclinux.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2d7f16d6
......@@ -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;
......
......@@ -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 */
......
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