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| author | Sebastian Siewior <bigeasy@linutronix.de> | 2008-05-01 12:16:29 +1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-01 08:08:35 -0700 |
| commit | a19325a77432338d2710b3ebbe7fd8e6627e81e3 (patch) | |
| tree | da28058ae14e32e2aeaebffd3c2eba2b31a7adda | |
| parent | 2d7f16d6d12682c41fb287ea8261df8e4679f638 (diff) | |
| download | linux-a19325a77432338d2710b3ebbe7fd8e6627e81e3.tar.gz linux-a19325a77432338d2710b3ebbe7fd8e6627e81e3.tar.bz2 linux-a19325a77432338d2710b3ebbe7fd8e6627e81e3.zip | |
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>
| -rw-r--r-- | arch/m68knommu/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/m68knommu/platform/coldfire/entry.S | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/m68knommu/kernel/asm-offsets.c b/arch/m68knommu/kernel/asm-offsets.c index fd0c685a7f11..c785d07c02cc 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 111b66dc737b..1af7c1d650f6 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 */ |