linux-kernel - [PATCH] powerpc/sysfs: disable hotplug for the boot cpu

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Date:	Tue, 28 May 2013 15:59:44 +0800
From:	Zhao Chenhui <chenhui.zhao@...escale.com>
To:	<linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <leoli@...escale.com>
Subject: [PATCH] powerpc/sysfs: disable hotplug for the boot cpu

Some features depend on the boot cpu, for instance, hibernate/suspend.
So disable hotplug for the boot cpu.

Signed-off-by: Zhao Chenhui <chenhui.zhao@...escale.com>
---
 arch/powerpc/kernel/sysfs.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index e68a845..294b1c4e 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -655,8 +655,10 @@ static int __init topology_init(void)
 		 * CPU.  For instance, the boot cpu might never be valid
 		 * for hotplugging.
 		 */
-		if (ppc_md.cpu_die)
+		if (ppc_md.cpu_die && cpu != boot_cpuid)
 			c->hotpluggable = 1;
+		else
+			c->hotpluggable = 0;
 
 		if (cpu_online(cpu) || c->hotpluggable) {
 			register_cpu(c, cpu);
-- 
1.7.3


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