When CONFIG_ARM_KERNMEM_PERMS=y and CONFIG_DEBUG_RODATA=y, the kernel
crashes during system suspend:
Freezing user space processes ... (elapsed 0.004 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.002 seconds)
done.
PM: suspend of devices complete after 111.948 msecs
PM: late suspend of devices complete after 1.086 msecs
PM: noirq suspend of devices complete after 11.576 msecs
Disabling non-boot CPUs ...
Kernel panic - not syncing: Attempted to kill the idle task!
1014ec ---[ end Kernel panic - not syncing: Attempted to kill the idle task!
CPU0: stopping
This happens because the .text section is marked read-only, while the
arrays shmobile_smp_mpidr[], shmobile_smp_fn[], and shmobile_smp_arg[]
are being written to.
Fix this by moving these arrays from the .text to the .data section.
This requires accessing them through a pointer after virtual to physical
translation.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
arch/arm/mach-shmobile/headsmp.S | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S
index 330c1fc63197df89..f924273ceaf476b4 100644
--- a/arch/arm/mach-shmobile/headsmp.S
+++ b/arch/arm/mach-shmobile/headsmp.S
@@ -50,9 +50,12 @@ ENTRY(shmobile_smp_boot)
mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR
and r0, r1, r0 @ r0 = cpu_logical_map() value
mov r1, #0 @ r1 = CPU index
- adr r5, 1f @ array of per-cpu mpidr values
- adr r6, 2f @ array of per-cpu functions
- adr r7, 3f @ array of per-cpu arguments
+ adr r2, 1f
+ ldmia r2, {r4, r5, r6, r7}
+ sub r2, r2, r4 @ virt->phys offset
+ add r5, r5, r2 @ array of per-cpu mpidr values
+ add r6, r6, r2 @ array of per-cpu functions
+ add r7, r7, r2 @ array of per-cpu arguments
shmobile_smp_boot_find_mpidr:
ldr r8, [r5, r1, lsl #2]
@@ -80,12 +83,19 @@ ENTRY(shmobile_smp_sleep)
b shmobile_smp_boot
ENDPROC(shmobile_smp_sleep)
+ .align 2
+1: .long .
+ .long shmobile_smp_mpidr
+ .long shmobile_smp_fn
+ .long shmobile_smp_arg
+
+ .data
.globl shmobile_smp_mpidr
shmobile_smp_mpidr:
-1: .space NR_CPUS * 4
+ .space NR_CPUS * 4
.globl shmobile_smp_fn
shmobile_smp_fn:
-2: .space NR_CPUS * 4
+ .space NR_CPUS * 4
.globl shmobile_smp_arg
shmobile_smp_arg:
-3: .space NR_CPUS * 4
+ .space NR_CPUS * 4
--
1.9.1
