1 files changed, 9 insertions, 2 deletions

diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 40190dbecdc0..deec1f8465e5 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -106,8 +106,6 @@ linux_gateway_entry:
         mtsp    %r0,%sr4                        /* get kernel space into sr4 */
         mtsp    %r0,%sr5                        /* get kernel space into sr5 */
         mtsp    %r0,%sr6                        /* get kernel space into sr6 */
-        mfsp    %sr7,%r1                        /* save user sr7 */
-        mtsp    %r1,%sr3                        /* and store it in sr3 */
 
 #ifdef CONFIG_64BIT
         /* for now we can *always* set the W bit on entry to the syscall
@@ -133,6 +131,14 @@ linux_gateway_entry:
         depdi   0, 31, 32, %r21
 1:      
 #endif
+
+        /* We use a rsm/ssm pair to prevent sr3 from being clobbered
+         * by external interrupts.
+         */
+        mfsp    %sr7,%r1                        /* save user sr7 */
+        rsm     PSW_SM_I, %r0                   /* disable interrupts */
+        mtsp    %r1,%sr3                        /* and store it in sr3 */
+
         mfctl   %cr30,%r1
         xor     %r1,%r30,%r30                   /* ye olde xor trick */
         xor     %r1,%r30,%r1
@@ -147,6 +153,7 @@ linux_gateway_entry:
          */
 
         mtsp    %r0,%sr7                        /* get kernel space into sr7 */
+        ssm     PSW_SM_I, %r0                   /* enable interrupts */
         STREGM  %r1,FRAME_SIZE(%r30)            /* save r1 (usp) here for now */
         mfctl   %cr30,%r1                       /* get task ptr in %r1 */
         LDREG   TI_TASK(%r1),%r1