linux-kernel - [PATCH] cpu: rid cpu_hotplug_disabled check for cpu

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Date:	Mon, 29 Apr 2013 10:49:51 +0800
From:	liguang <lig.fnst@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	liguang <lig.fnst@...fujitsu.com>
Subject: [PATCH] cpu: rid cpu_hotplug_disabled check for cpu_down()

in cpu_down(), _cpu_down() will do
"
        if (num_online_cpus() == 1)
                 return -EBUSY;
"
when cpu_hotplug_disabled was set, num_online_cpus
will return 1 for there's only 1 boot cpu.
so, it's unnecessary to check cpu_hotplug_disabled
here.

Signed-off-by: liguang <lig.fnst@...fujitsu.com>
---
 kernel/cpu.c |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index b5e4ab2..cd166d3 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -330,14 +330,8 @@ int __ref cpu_down(unsigned int cpu)
 
 	cpu_maps_update_begin();
 
-	if (cpu_hotplug_disabled) {
-		err = -EBUSY;
-		goto out;
-	}
-
 	err = _cpu_down(cpu, 0);
 
-out:
 	cpu_maps_update_done();
 	return err;
 }
-- 
1.7.2.5

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