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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: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Greg Ungerer 2007-07-25 22:07:20 +10:00 committed by Linus Torvalds
parent 063586a6b1
commit 7160a67305
1 changed files with 2 additions and 9 deletions
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11
arch/m68knommu/platform/5307/entry.S
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@ -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