1 files changed, 28 insertions, 13 deletions

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index 5d56a1ef5ba5..6943515100f8 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -839,6 +839,18 @@ STD_ENTRY(interrupt_return)
         FEEDBACK_REENTER(interrupt_return)
 
         /*
+         * Use r33 to hold whether we have already loaded the callee-saves
+         * into ptregs.  We don't want to do it twice in this loop, since
+         * then we'd clobber whatever changes are made by ptrace, etc.
+         * Get base of stack in r32.
+         */
+        {
+         GET_THREAD_INFO(r32)
+         movei  r33, 0
+        }
+
+.Lretry_work_pending:
+        /*
          * Disable interrupts so as to make sure we don't
          * miss an interrupt that sets any of the thread flags (like
          * need_resched or sigpending) between sampling and the iret.
@@ -848,9 +860,6 @@ STD_ENTRY(interrupt_return)
         IRQ_DISABLE(r20, r21)
         TRACE_IRQS_OFF  /* Note: clobbers registers r0-r29 */
 
-        /* Get base of stack in r32; note r30/31 are used as arguments here. */
-        GET_THREAD_INFO(r32)
-
 
         /* Check to see if there is any work to do before returning to user. */
         {
@@ -866,16 +875,18 @@ STD_ENTRY(interrupt_return)
 
         /*
          * Make sure we have all the registers saved for signal
-         * handling or single-step.  Call out to C code to figure out
-         * exactly what we need to do for each flag bit, then if
-         * necessary, reload the flags and recheck.
+         * handling, notify-resume, or single-step.  Call out to C
+         * code to figure out exactly what we need to do for each flag bit,
+         * then if necessary, reload the flags and recheck.
          */
-        push_extra_callee_saves r0
         {
          PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
-         jal    do_work_pending
+         bnz    r33, 1f
         }
-        bnz     r0, .Lresume_userspace
+        push_extra_callee_saves r0
+        movei   r33, 1
+1:      jal     do_work_pending
+        bnz     r0, .Lretry_work_pending
 
         /*
          * In the NMI case we
@@ -1180,10 +1191,12 @@ handle_syscall:
         add     r20, r20, tp
         lw      r21, r20
         addi    r21, r21, 1
-        sw      r20, r21
+        {
+         sw     r20, r21
+         GET_THREAD_INFO(r31)
+        }
 
         /* Trace syscalls, if requested. */
-        GET_THREAD_INFO(r31)
         addi    r31, r31, THREAD_INFO_FLAGS_OFFSET
         lw      r30, r31
         andi    r30, r30, _TIF_SYSCALL_TRACE
@@ -1362,7 +1375,10 @@ handle_ill:
 3:
         /* set PC and continue */
         lw      r26, r24
-        sw      r28, r26
+        {
+         sw     r28, r26
+         GET_THREAD_INFO(r0)
+        }
 
         /*
          * Clear TIF_SINGLESTEP to prevent recursion if we execute an ill.
@@ -1370,7 +1386,6 @@ handle_ill:
          * need to clear it here and can't really impose on all other arches.
          * So what's another write between friends?
          */
-        GET_THREAD_INFO(r0)
 
         addi    r1, r0, THREAD_INFO_FLAGS_OFFSET
         {