Patches adding support for hibernation on ARM - ARM hibernation / suspend-to-disk - 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 can be found here (includes v1 patchset): http://git.linaro.org/git-ro/people/sebastian.capella/linux.git hibernation_3.13_russMerge
[PATCH v4 1/2] 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. (unchanged since v3)
[PATCH v4 2/2] ARM hibernation / suspend-to-disk arch/arm/include/asm/memory.h | 1 + arch/arm/kernel/Makefile | 1 + arch/arm/kernel/hibernate.c | 113 +++++++++++++++++++++++++++++++++++++++++ arch/arm/mm/Kconfig | 5 ++ include/linux/suspend.h | 2 + 5 files changed, 122 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 v4: -------------- * updated comment for soft_restart with review feedback * dropped freeze_processes patch which was queued separately to 3.14 by Rafael Wysocki: https://lkml.org/lkml/2014/2/25/683
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 cyril@ti.com from Cc: list as emails are bouncing.
Thanks,
Sebastian Capella