linux_dsm_epyc7002/arch/alpha
Prarit Bhargava 8b43fd8c1f 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>
2024-07-05 18:52:32 +02:00
..
boot
configs
include local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
kernel alpha: Send stop IPI to send to online CPUs 2024-07-05 18:52:32 +02:00
lib
math-emu
mm
oprofile
Kconfig
Kconfig.debug
Makefile