MIPS: Reorder operations in stackframe.h for better scheduling

Reorder PT ops to avoid pipeline stalls.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 12 insertions, 8 deletions

diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h
index db0fa7b5aeaf..dd7e220e087b 100644
--- a/arch/mips/include/asm/stackframe.h
+++ b/arch/mips/include/asm/stackframe.h
@@ -51,9 +51,6 @@
                 LONG_S  v1, PT_ACX(sp)
 #else
                 mfhi    v1
-                LONG_S  v1, PT_HI(sp)
-                mflo    v1
-                LONG_S  v1, PT_LO(sp)
 #endif
 #ifdef CONFIG_32BIT
                 LONG_S  $8, PT_R8(sp)
@@ -62,10 +59,17 @@
                 LONG_S  $10, PT_R10(sp)
                 LONG_S  $11, PT_R11(sp)
                 LONG_S  $12, PT_R12(sp)
+#ifndef CONFIG_CPU_HAS_SMARTMIPS
+                LONG_S  v1, PT_HI(sp)
+                mflo    v1
+#endif
                 LONG_S  $13, PT_R13(sp)
                 LONG_S  $14, PT_R14(sp)
                 LONG_S  $15, PT_R15(sp)
                 LONG_S  $24, PT_R24(sp)
+#ifndef CONFIG_CPU_HAS_SMARTMIPS
+                LONG_S  v1, PT_LO(sp)
+#endif
                 .endm
 
                 .macro  SAVE_STATIC
@@ -166,7 +170,6 @@
                 LONG_S  $0, PT_R0(sp)
                 mfc0    v1, CP0_STATUS
                 LONG_S  $2, PT_R2(sp)
-                LONG_S  v1, PT_STATUS(sp)
 #ifdef CONFIG_MIPS_MT_SMTC
                 /*
                  * Ideally, these instructions would be shuffled in
@@ -178,20 +181,21 @@
                 LONG_S  v1, PT_TCSTATUS(sp)
 #endif /* CONFIG_MIPS_MT_SMTC */
                 LONG_S  $4, PT_R4(sp)
-                mfc0    v1, CP0_CAUSE
                 LONG_S  $5, PT_R5(sp)
-                LONG_S  v1, PT_CAUSE(sp)
+                LONG_S  v1, PT_STATUS(sp)
+                mfc0    v1, CP0_CAUSE
                 LONG_S  $6, PT_R6(sp)
-                MFC0    v1, CP0_EPC
                 LONG_S  $7, PT_R7(sp)
+                LONG_S  v1, PT_CAUSE(sp)
+                MFC0    v1, CP0_EPC
 #ifdef CONFIG_64BIT
                 LONG_S  $8, PT_R8(sp)
                 LONG_S  $9, PT_R9(sp)
 #endif
-                LONG_S  v1, PT_EPC(sp)
                 LONG_S  $25, PT_R25(sp)
                 LONG_S  $28, PT_R28(sp)
                 LONG_S  $31, PT_R31(sp)
+                LONG_S  v1, PT_EPC(sp)
                 ori     $28, sp, _THREAD_MASK
                 xori    $28, _THREAD_MASK
 #ifdef CONFIG_CPU_CAVIUM_OCTEON