linux-kernel - [tip:smp/hotplug] ia64: SMP: Remove call to ipi_call_lock_irq()/ ipi_call_unlock

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Message-ID: <tip-459165e25030c0023cb54f73c14261a3d2f4a244@git.kernel.org>
Date:	Tue, 5 Jun 2012 08:48:49 -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,
	tony.luck@...el.com, fenghua.yu@...el.com, tglx@...utronix.de,
	yong.zhang0@...il.com
Subject: [tip:smp/hotplug] ia64: SMP: Remove call to ipi_call_lock_irq()/
 ipi_call_unlock_irq()

Commit-ID:  459165e25030c0023cb54f73c14261a3d2f4a244
Gitweb:     http://git.kernel.org/tip/459165e25030c0023cb54f73c14261a3d2f4a244
Author:     Yong Zhang <yong.zhang0@...il.com>
AuthorDate: Tue, 29 May 2012 15:16:02 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 5 Jun 2012 17:27:13 +0200

ia64: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq()

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: Tony Luck <tony.luck@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: linux-ia64@...r.kernel.org
Link: http://lkml.kernel.org/r/1338275765-3217-8-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/ia64/kernel/smpboot.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 1113b8a..963d2db 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -382,7 +382,6 @@ smp_callin (void)
 	set_numa_node(cpu_to_node_map[cpuid]);
 	set_numa_mem(local_memory_node(cpu_to_node_map[cpuid]));
 
-	ipi_call_lock_irq();
 	spin_lock(&vector_lock);
 	/* Setup the per cpu irq handling data structures */
 	__setup_vector_irq(cpuid);
@@ -390,7 +389,6 @@ smp_callin (void)
 	set_cpu_online(cpuid, true);
 	per_cpu(cpu_state, cpuid) = CPU_ONLINE;
 	spin_unlock(&vector_lock);
-	ipi_call_unlock_irq();
 
 	smp_setup_percpu_timer();
 
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