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mn10300: SMP: Remove call to ipi_call_lock()/ipi_call_unlock() 

ipi_call_lock/unlock() lock resp. unlock call_function.lock. This lock
protects only the call_function data structure itself, but it's
completely unrelated to cpu_online_mask. The mask to which the IPIs
are sent is calculated before call_function.lock is taken in
smp_call_function_many(), so the locking around set_cpu_online() is
pointless and can be removed.

[ tglx: Massaged changelog ]

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: ralf@linux-mips.org
Cc: sshtylyov@mvista.com
Cc: david.daney@cavium.com
Cc: nikunj@linux.vnet.ibm.com
Cc: paulmck@linux.vnet.ibm.com
Cc: axboe@kernel.dk
Cc: peterz@infradead.org
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: linux-am33-list@redhat.com
Link: http://lkml.kernel.org/r/1338275765-3217-3-git-send-email-yong.zhang0@gmail.com
Acked-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yong Zhang 2012-05-29 15:15:57 +08:00 committed by Thomas Gleixner
parent 4ee0444beb
commit 4cbd19fcf9
1 changed files with 0 additions and 2 deletions
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2
arch/mn10300/kernel/smp.c
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@ -876,9 +876,7 @@ static void __init smp_online(void)
notify_cpu_starting(cpu); notify_cpu_starting(cpu);
ipi_call_lock();
set_cpu_online(cpu, true); set_cpu_online(cpu, true);
ipi_call_unlock();
local_irq_enable(); local_irq_enable();
} }