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| author | Prarit Bhargava <prarit@redhat.com> | 2021-01-05 10:16:27 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-12 13:19:45 +0200 |
| commit | 704e08f3475347666ebed4e018fad7277834f056 (patch) | |
| tree | 7fb6b50f31d574a617ba083bcf0f1f11543639dd | |
| parent | 4d7ee5d0a6a960f1790be3c9a0c71573405df63a (diff) | |
| download | linux-stable-704e08f3475347666ebed4e018fad7277834f056.tar.gz linux-stable-704e08f3475347666ebed4e018fad7277834f056.tar.bz2 linux-stable-704e08f3475347666ebed4e018fad7277834f056.zip | |
alpha: Send stop IPI to send to online CPUs
[ Upstream commit caace6ca4e06f09413fb8f8a63319594cfb7d47d ]
This issue was noticed while debugging a shutdown issue where some
secondary CPUs are not being shutdown correctly. A fix for that [1] requires
that secondary cpus be offlined using the cpu_online_mask so that the
stop operation is a no-op if CPU HOTPLUG is disabled. I, like the author in
[1] looked at the architectures and found that alpha is one of two
architectures that executes smp_send_stop() on all possible CPUs.
On alpha, smp_send_stop() sends an IPI to all possible CPUs but only needs
to send them to online CPUs.
Send the stop IPI to only the online CPUs.
[1] https://lkml.org/lkml/2020/1/10/250
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/alpha/kernel/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c index d0dccae53ba9..8a89b9adb4fe 100644 --- a/arch/alpha/kernel/smp.c +++ b/arch/alpha/kernel/smp.c @@ -585,7 +585,7 @@ void smp_send_stop(void) { cpumask_t to_whom; - cpumask_copy(&to_whom, cpu_possible_mask); + cpumask_copy(&to_whom, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &to_whom); #ifdef DEBUG_IPI_MSG if (hard_smp_processor_id() != boot_cpu_id) |