From: Huacai Chen <chenhc@lemote.com>
Date: Thu, 16 Jul 2020 10:40:23 +0000 (+0800)
Subject: MIPS: CPU#0 is not hotpluggable
X-Git-Tag: v4.9.233~28
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed1c51274e2ead399315aca6eeb58876c825a77a;p=platform%2Fkernel%2Flinux-amlogic.git

MIPS: CPU#0 is not hotpluggable

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>
---

diff --git a/arch/mips/kernel/topology.c b/arch/mips/kernel/topology.c
index cf3eb61fad12..68da7613874a 100644
--- a/arch/mips/kernel/topology.c
+++ b/arch/mips/kernel/topology.c
@@ -19,7 +19,7 @@ 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 "