linux-kernel - [tip:smp/hotplug] parisc: Smp: remove call to ipi_call_lock()/ ipi_call

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Date:	Tue, 5 Jun 2012 08:45:18 -0700
From:	tip-bot for Yong Zhang <yong.zhang0@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, srivatsa.bhat@...ux.vnet.ibm.com,
	jejb@...isc-linux.org, tglx@...utronix.de, yong.zhang0@...il.com,
	deller@....de
Subject: [tip:smp/hotplug] parisc: Smp: remove call to ipi_call_lock()/
 ipi_call_unlock()

Commit-ID:  ac4216d6922f90c459d531e051c832dadde3a8f7
Gitweb:     http://git.kernel.org/tip/ac4216d6922f90c459d531e051c832dadde3a8f7
Author:     Yong Zhang <yong.zhang0@...il.com>
AuthorDate: Tue, 29 May 2012 15:15:58 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 5 Jun 2012 17:27:12 +0200

parisc: 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@...il.com>
Cc: ralf@...ux-mips.org
Cc: sshtylyov@...sta.com
Cc: david.daney@...ium.com
Cc: nikunj@...ux.vnet.ibm.com
Cc: paulmck@...ux.vnet.ibm.com
Cc: axboe@...nel.dk
Cc: peterz@...radead.org
Cc: James E.J. Bottomley <jejb@...isc-linux.org>
Cc: Helge Deller <deller@....de>
Cc: linux-parisc@...r.kernel.org
Link: http://lkml.kernel.org/r/1338275765-3217-4-git-send-email-yong.zhang0@gmail.com
Acked-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/parisc/kernel/smp.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index a47828d..6266730 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -300,9 +300,7 @@ smp_cpu_init(int cpunum)
 
 	notify_cpu_starting(cpunum);
 
-	ipi_call_lock();
 	set_cpu_online(cpunum, true);
-	ipi_call_unlock();
 
 	/* Initialise the idle task for this CPU */
 	atomic_inc(&init_mm.mm_count);
--
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