On Sat, Jul 06, 2024 at 05:46:08PM +0200, Thomas Gleixner wrote:
From: Huacai Chen chenhuacai@kernel.org
commit 6ef8eb5125722c241fd60d7b0c872d5c2e5dd4ca upstream.
After the rework of "Parallel CPU bringup", the cmdline "nosmp" and "maxcpus=0" parameters are not working anymore. These parameters set setup_max_cpus to zero and that's handed to bringup_nonboot_cpus().
The code there does a decrement before checking for zero, which brings it into the negative space and brings up all CPUs.
Add a zero check at the beginning of the function to prevent this.
[ tglx: Massaged change log ]
Fixes: 18415f33e2ac4ab382 ("cpu/hotplug: Allow "parallel" bringup up to CPUHP_BP_KICK_AP_STATE") Fixes: 06c6796e0304234da6 ("cpu/hotplug: Fix off by one in cpuhp_bringup_mask()") Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240618081336.3996825-1-chenhuacai@loongson.cn
kernel/cpu.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/kernel/cpu.c
Now queued up, thanks.
greg k-h