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authorPrarit Bhargava <prarit@redhat.com>2021-01-05 18:16:27 +0300
committerMatt Turner <mattst88@gmail.com>2021-07-26 08:33:03 +0300
commitcaace6ca4e06f09413fb8f8a63319594cfb7d47d (patch)
tree995b1ae5c9a0a7f686b8c4cc7d2321908eed0e7b /arch/alpha
parentf0443da1d8560f4c664ab0f9a900ed69e9aaeb14 (diff)
downloadlinux-caace6ca4e06f09413fb8f8a63319594cfb7d47d.tar.xz
alpha: Send stop IPI to send to online CPUs
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>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/kernel/smp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 4b2575f936d4..cb64e4797d2a 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -582,7 +582,7 @@ 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)