ARM: pm: CPU specific code should not overwrite r1 (v:p offset)

r1 stores the v:p offset from the CPU invariant resume code, and is
expected to be preserved by the CPU specific code.  Overwriting it is
not a good idea.

We've managed to get away with it on sa1100 platforms because most
happen to have PHYS_OFFSET == PAGE_OFFSET, but that may not be the
case depending on kernel configuration.  So fix this latent bug.

This fixes xsc3 as well which was saving and restoring this register
independently.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 07219c2..69e7f2e 100644 (file)
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -182,11 +182,11 @@ ENDPROC(cpu_sa1100_do_suspend)
 
 ENTRY(cpu_sa1100_do_resume)
        ldmia   r0, {r4 - r7}                   @ load cp regs
-       mov     r1, #0
-       mcr     p15, 0, r1, c8, c7, 0           @ flush I+D TLBs
-       mcr     p15, 0, r1, c7, c7, 0           @ flush I&D cache
-       mcr     p15, 0, r1, c9, c0, 0           @ invalidate RB
-       mcr     p15, 0, r1, c9, c0, 5           @ allow user space to use RB
+       mov     ip, #0
+       mcr     p15, 0, ip, c8, c7, 0           @ flush I+D TLBs
+       mcr     p15, 0, ip, c7, c7, 0           @ flush I&D cache
+       mcr     p15, 0, ip, c9, c0, 0           @ invalidate RB
+       mcr     p15, 0, ip, c9, c0, 5           @ allow user space to use RB
 
        mcr     p15, 0, r4, c3, c0, 0           @ domain ID
        mcr     p15, 0, r5, c2, c0, 0           @ translation table base addr

diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S
index 28c72a2..755e1bf 100644 (file)
--- a/arch/arm/mm/proc-xsc3.S
+++ b/arch/arm/mm/proc-xsc3.S
@@ -406,7 +406,7 @@ ENTRY(cpu_xsc3_set_pte_ext)
        .align
 
 .globl cpu_xsc3_suspend_size
-.equ   cpu_xsc3_suspend_size, 4 * 8
+.equ   cpu_xsc3_suspend_size, 4 * 7
 #ifdef CONFIG_PM_SLEEP
 ENTRY(cpu_xsc3_do_suspend)
        stmfd   sp!, {r4 - r10, lr}
@@ -418,12 +418,12 @@ ENTRY(cpu_xsc3_do_suspend)
        mrc     p15, 0, r9, c1, c0, 1   @ auxiliary control reg
        mrc     p15, 0, r10, c1, c0, 0  @ control reg
        bic     r4, r4, #2              @ clear frequency change bit
-       stmia   r0, {r1, r4 - r10}      @ store v:p offset + cp regs
+       stmia   r0, {r4 - r10}          @ store cp regs
        ldmia   sp!, {r4 - r10, pc}
 ENDPROC(cpu_xsc3_do_suspend)
 
 ENTRY(cpu_xsc3_do_resume)
-       ldmia   r0, {r1, r4 - r10}      @ load v:p offset + cp regs
+       ldmia   r0, {r4 - r10}          @ load cp regs
        mov     ip, #0
        mcr     p15, 0, ip, c7, c7, 0   @ invalidate I & D caches, BTB
        mcr     p15, 0, ip, c7, c10, 4  @ drain write (&fill) buffer