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Subject[PATCH v3 0/3] hibernation support on ARM
Patches adding support for hibernation on ARM
- ARM hibernation / suspend-to-disk
- Fix hang in freeze_processes during hibernation
- Change soft_restart to use non-tracing raw_local_irq_disable

Patches based on v3.13 tag, verified hibernation on beaglebone black on a branch
based on 3.13 merged with initial omap support from Russ Dill which be found here: hibernation_3.13_russMerge
(includes v1 patchset)

[PATCH v3 1/3] Fix hibernation restore hang in freeze_processes
drivers/base/firmware_class.c | 1 +
1 file changed, 1 insertion(+)

Add handling for PM_RESTORE_PREPARE notifier (unchanged from v1)

[PATCH v3 2/3] ARM: avoid tracers in soft_restart
arch/arm/kernel/process.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Use raw_local_irq_disable in place of local_irq_disable to avoid
infinite abort recursion while tracing.

[PATCH v3 3/3] ARM hibernation / suspend-to-disk
arch/arm/include/asm/memory.h | 1 +
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/hibernate.c | 106 +++++++++++++++++++++++++++++++++++++++++
arch/arm/mm/Kconfig | 5 ++
include/linux/suspend.h | 2 +
5 files changed, 115 insertions(+)

Adds support for ARM based hibernation

Additional notes:

There are two checkpatch warnings added by this patch. These follow
behavior in existing hibernation implementations on other platforms.

WARNING: externs should be avoided in .c files
#116: FILE: arch/arm/kernel/hibernate.c:26:
+extern const void __nosave_begin, __nosave_end;

This extern is picking up the linker nosave region definitions, only
used in hibernate. Follows same extern line used mips, powerpc, s390,
sh, sparc, x86 & unicore32

WARNING: externs should be avoided in .c files
#191: FILE: arch/arm/kernel/hibernate.c:101:
+extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);

This extern is used in the arch/arm/ in hibernate, process and bL_switcher

Changes in v3:
* added comment to use of soft_restart
* drop irq disable soft_restart patch
* add patch to avoid tracers in soft_restart by using raw_local_irq_*

Changes in v2:
* Removed unneeded flush_thread, use of __naked and cpu_init.
* dropped Cyril Chemparathy <> from Cc: list as
emails are bouncing.


Sebastian Capella

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