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parisc: Fix crash with nr_cpus=1 option 

commit d3b3c637e4 upstream.

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 <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.18+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2023-09-19 15:26:35 +02:00 committed by Greg Kroah-Hartman
parent c9c110ce37
commit 485f0bac83
1 changed files with 3 additions and 1 deletions
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4
arch/parisc/kernel/smp.c
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@ -443,7 +443,9 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
if (cpu_online(cpu)) if (cpu_online(cpu))
return 0; 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 -EIO;
return cpu_online(cpu) ? 0 : -EIO; return cpu_online(cpu) ? 0 : -EIO;