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| author | Nicholas Piggin <npiggin@gmail.com> | 2019-04-11 13:34:46 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-05-03 19:42:58 +0200 |
| commit | 9ca12ac04bb7d7cfb28aa549dcd3d15761f15543 (patch) | |
| tree | 98dbad7e8c82eea820041cdf693d02b919d0ecc1 /include/linux/cpu.h | |
| parent | 2f1a6fbbef7781382850c3104ecb658f21b5d460 (diff) | |
| download | linux-stable-9ca12ac04bb7d7cfb28aa549dcd3d15761f15543.tar.gz linux-stable-9ca12ac04bb7d7cfb28aa549dcd3d15761f15543.tar.bz2 linux-stable-9ca12ac04bb7d7cfb28aa549dcd3d15761f15543.zip | |
kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec freeze
This patch provides an arch option, ARCH_SUSPEND_NONZERO_CPU, to
opt-in to allowing suspend to occur on one of the housekeeping CPUs
rather than hardcoded CPU0.
This will allow CPU0 to be a nohz_full CPU with a later change.
It may be possible for platforms with hardware/firmware restrictions
on suspend/wake effectively support this by handing off the final
stage to CPU0 when kernel housekeeping is no longer required. Another
option is to make housekeeping / nohz_full mask dynamic at runtime,
but the complexity could not be justified at this time.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lkml.kernel.org/r/20190411033448.20842-4-npiggin@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/cpu.h')
| -rw-r--r-- | include/linux/cpu.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 7ab2f09c0a14..73baab8535c1 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -140,7 +140,12 @@ extern void enable_nonboot_cpus(void); static inline int suspend_disable_secondary_cpus(void) { - return freeze_secondary_cpus(0); + int cpu = 0; + + if (IS_ENABLED(CONFIG_PM_SLEEP_SMP_NONZERO_CPU)) + cpu = -1; + + return freeze_secondary_cpus(cpu); } static inline void suspend_enable_secondary_cpus(void) { |