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authorGreg Ungerer <gerg@snapgear.com>2007-07-25 22:07:20 +1000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-25 11:05:01 -0700
commit7160a67305f08d52284b333f1403abbf8b0a1970 (patch)
treefdde56856b37c2f775ed757bb13ecbb9bece81ea /arch/m68knommu
parentm68knommu: create hw_irq.h (diff)
downloadlinux-dev-7160a67305f08d52284b333f1403abbf8b0a1970.tar.xz
linux-dev-7160a67305f08d52284b333f1403abbf8b0a1970.zip
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>
Diffstat (limited to 'arch/m68knommu')
-rw-r--r--arch/m68knommu/platform/5307/entry.S11
1 files changed, 2 insertions, 9 deletions
diff --git a/arch/m68knommu/platform/5307/entry.S b/arch/m68knommu/platform/5307/entry.S
index c358aebe0af3..a8cd867805ca 100644
--- a/arch/m68knommu/platform/5307/entry.S
+++ b/arch/m68knommu/platform/5307/entry.S
@@ -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