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| author | Peter Zijlstra <peterz@infradead.org> | 2021-01-19 18:43:45 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-04-16 17:06:32 +0200 |
| commit | e40f74c535b8a0ecf3ef0388b51a34cdadb34fb5 (patch) | |
| tree | fdaa32a293b6dc3df7213ceebd91892a57a7ae65 /kernel/cpu.c | |
| parent | b02a4fd8148f655095d9e3d6eddd8f0042bcc27c (diff) | |
| download | linux-stable-e40f74c535b8a0ecf3ef0388b51a34cdadb34fb5.tar.gz | |
cpumask: Introduce DYING mask
Introduce a cpumask that indicates (for each CPU) what direction the
CPU hotplug is currently going. Notably, it tracks rollbacks. Eg. when
an up fails and we do a roll-back down, it will accurately reflect the
direction.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210310150109.151441252@infradead.org
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 23505d6abd45..838dcf238f92 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -160,6 +160,9 @@ static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state, int (*cb)(unsigned int cpu); int ret, cnt; + if (cpu_dying(cpu) != !bringup) + set_cpu_dying(cpu, !bringup); + if (st->fail == state) { st->fail = CPUHP_INVALID; return -EAGAIN; @@ -2512,6 +2515,9 @@ EXPORT_SYMBOL(__cpu_present_mask); struct cpumask __cpu_active_mask __read_mostly; EXPORT_SYMBOL(__cpu_active_mask); +struct cpumask __cpu_dying_mask __read_mostly; +EXPORT_SYMBOL(__cpu_dying_mask); + atomic_t __num_online_cpus __read_mostly; EXPORT_SYMBOL(__num_online_cpus); |