This is a note to let you know that I've just added the patch titled
parisc: Fix crash with nr_cpus=1 option
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-fix-crash-with-nr_cpus-1-option.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d3b3c637e4eb8d3bbe53e5692aee66add72f9851 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Tue, 19 Sep 2023 15:26:35 +0200
Subject: parisc: Fix crash with nr_cpus=1 option
From: Helge Deller <deller@xxxxxx>
commit d3b3c637e4eb8d3bbe53e5692aee66add72f9851 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@xxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v5.18+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/smp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -440,7 +440,9 @@ int __cpu_up(unsigned int cpu, struct ta
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;
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-6.5/parisc-fix-crash-with-nr_cpus-1-option.patch
queue-6.5/parisc-restore-__ldcw_align-for-pa-risc-2.0-processors.patch
