[PATCH 6.6.y] cpu: Fix broken cmdline "nosmp" and "maxcpus=0"

[Thomas Gleixner <tglx@linutronix.de>]

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
+++ b/kernel/cpu.c
@@ -1907,6 +1907,9 @@ static inline bool cpuhp_bringup_cpus_pa
 
 void __init bringup_nonboot_cpus(unsigned int setup_max_cpus)
 {
+	if (!setup_max_cpus)
+		return;
+
 	/* Try parallel bringup optimization if enabled */
 	if (cpuhp_bringup_cpus_parallel(setup_max_cpus))
 		return;