ARM: pm: only use preallocated page table during resume

Only use the preallocated page table during the resume, not while
suspending.  This avoids the overhead of having to switch unnecessarily
to the resume page table in the suspend path.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 9 deletions

diff --git a/arch/arm/mm/proc-arm926.S b/arch/arm/mm/proc-arm926.S
index 48add848b997..9f8fd91f918a 100644
--- a/arch/arm/mm/proc-arm926.S
+++ b/arch/arm/mm/proc-arm926.S
@@ -394,27 +394,26 @@ ENTRY(cpu_arm926_set_pte_ext)
 
 /* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
 .globl  cpu_arm926_suspend_size
-.equ    cpu_arm926_suspend_size, 4 * 4
+.equ    cpu_arm926_suspend_size, 4 * 3
 #ifdef CONFIG_PM_SLEEP
 ENTRY(cpu_arm926_do_suspend)
-        stmfd   sp!, {r4 - r7, lr}
+        stmfd   sp!, {r4 - r6, lr}
         mrc     p15, 0, r4, c13, c0, 0  @ PID
         mrc     p15, 0, r5, c3, c0, 0   @ Domain ID
-        mrc     p15, 0, r6, c2, c0, 0   @ TTB address
-        mrc     p15, 0, r7, c1, c0, 0   @ Control register
-        stmia   r0, {r4 - r7}
-        ldmfd   sp!, {r4 - r7, pc}
+        mrc     p15, 0, r6, c1, c0, 0   @ Control register
+        stmia   r0, {r4 - r6}
+        ldmfd   sp!, {r4 - r6, pc}
 ENDPROC(cpu_arm926_do_suspend)
 
 ENTRY(cpu_arm926_do_resume)
         mov     ip, #0
         mcr     p15, 0, ip, c8, c7, 0   @ invalidate I+D TLBs
         mcr     p15, 0, ip, c7, c7, 0   @ invalidate I+D caches
-        ldmia   r0, {r4 - r7}
+        ldmia   r0, {r4 - r6}
         mcr     p15, 0, r4, c13, c0, 0  @ PID
         mcr     p15, 0, r5, c3, c0, 0   @ Domain ID
-        mcr     p15, 0, r6, c2, c0, 0   @ TTB address
-        mov     r0, r7                  @ control register
+        mcr     p15, 0, r1, c2, c0, 0   @ TTB address
+        mov     r0, r6                  @ control register
         b       cpu_resume_mmu
 ENDPROC(cpu_arm926_do_resume)
 #endif