All of
 help / color / mirror / Atom feed
From: Helge Deller <>
To:, John David Anglin <>
Subject: [PATCH] parisc: Fix crash with nr_cpus=1 option
Date: Tue, 19 Sep 2023 15:26:35 +0200	[thread overview]
Message-ID: <ZQmhi9UoJUerNFAB@p100> (raw)

John David Anglin reported that giving "nr_cpus=1" on the command
line causes a crash, while "maxcpus=1" works.

Reported-by: John David Anglin <>
Signed-off-by: Helge Deller <>

diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 4098f9a0964b..2019c1f04bd0 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -440,7 +440,9 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 	if (cpu_online(cpu))
 		return 0;
-	if (num_online_cpus() < setup_max_cpus && smp_boot_one_cpu(cpu, tidle))
+	if (num_online_cpus() < nr_cpu_ids &&
+		num_online_cpus() < setup_max_cpus &&
+		smp_boot_one_cpu(cpu, tidle))
 		return -EIO;
 	return cpu_online(cpu) ? 0 : -EIO;

                 reply	other threads:[~2023-09-19 13:26 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ZQmhi9UoJUerNFAB@p100 \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.