ARM: suspend: use idmap_pgd instead of suspend_pgd

The ARM CPU suspend code requires cpu_resume_mmu to be identity mapped
in order to re-enable the MMU when coming out of suspend. Currently,
this is accomplished by maintaining a suspend_pgd with the relevant
mapping put in place at init time.

This patch replaces the use of suspend_pgd with the new idmap_pgd.
cpu_resume_mmu is placed in the .idmap.text section so that it is
included in the identity map.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 020e99c845e7..9e64231c8cfe 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -54,6 +54,7 @@ ENDPROC(cpu_suspend_abort)
  * r0 = control register value
  */
         .align  5
+        .pushsection    .idmap.text,"ax"
 ENTRY(cpu_resume_mmu)
         ldr     r3, =cpu_resume_after_mmu
         mcr     p15, 0, r0, c1, c0, 0   @ turn on MMU, I-cache, etc
@@ -62,6 +63,7 @@ ENTRY(cpu_resume_mmu)
         mov     r0, r0
         mov     pc, r3                  @ jump to virtual address
 ENDPROC(cpu_resume_mmu)
+        .popsection
 cpu_resume_after_mmu:
         bl      cpu_init                @ restore the und/abt/irq banked regs
         mov     r0, #0                  @ return zero on success