提交 7160a673 编写于 作者: G Greg Ungerer 提交者: Linus Torvalds

m68knommu: simplify ColdFire resume code

It is useless to preserve THREAD_SR in `resume'.  The real user's sr
is actually in the stack.  We also don't need to disable interrupts :
we'll never be in an invalid state, the sp switch is atomic.
Signed-off-by: NPhilippe De Muyter <phdm@macqel.be>
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 063586a6
......@@ -213,16 +213,12 @@ ENTRY(ret_from_interrupt)
* Beware - when entering resume, prev (the current task) is
* in a0, next (the new task) is in a1,so don't change these
* registers until their contents are no longer needed.
* This is always called in supervisor mode, so don't bother to save
* and restore sr; user's process sr is actually in the stack.
*/
ENTRY(resume)
movel %a0, %d1 /* get prev thread in d1 */
movew %sr,%d0 /* save thread status reg */
movew %d0,%a0@(TASK_THREAD+THREAD_SR)
oril #0x700,%d0 /* disable interrupts */
move %d0,%sr
movel sw_usp,%d0 /* save usp */
movel %d0,%a0@(TASK_THREAD+THREAD_USP)
......@@ -233,7 +229,4 @@ ENTRY(resume)
movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore thread user stack */
movel %a0, sw_usp
movew %a1@(TASK_THREAD+THREAD_SR),%d0 /* restore thread status reg */
movew %d0, %sr
rts
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