ARC: K/U SP saved from one location in stack switching macro

This paves way for further simplifications.

There's an overhead of 1 insn for the non-common case of interrupt taken
from kernel mode.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h
index 5191945f3d39..2cf6aa08cfca 100644
--- a/arch/arc/include/asm/entry.h
+++ b/arch/arc/include/asm/entry.h
@@ -290,9 +290,8 @@
          * safe-keeping not really needed, but it keeps the epilogue code
          * (SP restore) simpler/uniform.
          */
-        b.d     77f
-
-        st.a    sp, [sp, -12]   ; Make room for orig_r0 and orig_r8
+        b.d     66f
+        mov     r9, sp
 
 88: /*------Intr/Ecxp happened in user mode, "switch" stack ------ */
 
@@ -311,6 +310,7 @@
         /* With current tsk in r9, get it's kernel mode stack base */
         GET_TSK_STACK_BASE  r9, r9
 
+66:
         /* Save Pre Intr/Exception User SP on kernel stack */
         st.a    sp, [r9, -12]   ; Make room for orig_r0 and orig_r8
 
@@ -323,7 +323,7 @@
         /* set SP to point to kernel mode stack */
         mov sp, r9
 
-77: /* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */
+        /* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */
 
 .endm