[PATCH 5.7 063/204] MIPS: CPU#0 is not hotpluggable

Greg Kroah-Hartman
2020-08-20T09:39:19Z

From: Huacai Chen <chenhc@lemote.com>

commit 9cce844abf07b683cff5f0273977d5f8d0af94c7 upstream.

Now CPU#0 is not hotpluggable on MIPS, so prevent to create /sys/devices
/system/cpu/cpu0/online which confuses some user-space tools.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/mips/kernel/topology.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/kernel/topology.c
+++ b/arch/mips/kernel/topology.c
@@ -20,7 +20,7 @@ static int __init topology_init(void)
for_each_present_cpu(i) {
struct cpu *c = &per_cpu(cpu_devices, i);

- c->hotpluggable = 1;
+ c->hotpluggable = !!i;
ret = register_cpu(c, i);
if (ret)
printk(KERN_WARNING "topology_init: register_cpu %d "