ARM: pm: get rid of cpu_resume_turn_mmu_on

We don't require cpu_resume_turn_mmu_on as we can combine the ldr
instruction with the following code provided we ensure that
cpu_resume_mmu is aligned for older CPUs.  Note that we also align
to a 32-byte boundary to ensure that the code can't cross a section
boundary.

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>

diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 25d42df..c9a43ca 100644 (file)
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -72,19 +72,15 @@ ENDPROC(cpu_suspend_abort)
 /*
  * r0 = control register value
  */
+       .align  5
 ENTRY(cpu_resume_mmu)
        ldr     r3, =cpu_resume_after_mmu
-       b       cpu_resume_turn_mmu_on
-ENDPROC(cpu_resume_mmu)
-       .ltorg
-       .align  5
-ENTRY(cpu_resume_turn_mmu_on)
        mcr     p15, 0, r0, c1, c0, 0   @ turn on MMU, I-cache, etc
        mrc     p15, 0, r0, c0, c0, 0   @ read id reg
        mov     r0, r0
        mov     r0, r0
        mov     pc, r3                  @ jump to virtual address
-ENDPROC(cpu_resume_turn_mmu_on)
+ENDPROC(cpu_resume_mmu)
 cpu_resume_after_mmu:
        bl      cpu_init                @ restore the und/abt/irq banked regs
        mov     r0, #0                  @ return zero on success

diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index 2beda56..ed4160b 100644 (file)
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -9,7 +9,7 @@
 static pgd_t *suspend_pgd;
 
 extern int __cpu_suspend(int, long, unsigned long, int (*)(unsigned long));
-extern void cpu_resume_turn_mmu_on(void);
+extern void cpu_resume_mmu(void);
 
 /*
  * Hide the first two arguments to __cpu_suspend - these are an implementation
@@ -43,7 +43,7 @@ static int __init cpu_suspend_init(void)
 {
        suspend_pgd = pgd_alloc(&init_mm);
        if (suspend_pgd) {
-               unsigned long addr = virt_to_phys(cpu_resume_turn_mmu_on);
+               unsigned long addr = virt_to_phys(cpu_resume_mmu);
                identity_mapping_add(suspend_pgd, addr, addr + SECTION_SIZE);
        }
        return suspend_pgd ? 0 : -ENOMEM;