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>

diff --git a/arch/m68knommu/platform/5307/entry.S b/arch/m68knommu/platform/5307/entry.S
index c358aeb..a8cd867 100644 (file)
--- 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