linux-kernel - [PATCH 128/145] ARM: 7778/1: smp_twd: twd_update

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Message-Id: <1374101277-7915-129-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jul 2013 15:47:40 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Jason Liu <r64343@...escale.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 128/145] ARM: 7778/1: smp_twd: twd_update_frequency need be run on all online CPUs

3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Liu <r64343@...escale.com>

commit cbbe6f82b489e7ceba4ad7c833bd3a76cd0084cb upstream.

When the local timer freq changed, the twd_update_frequency function
should be run all the CPUs include itself, otherwise, the twd freq will
not get updated and the local timer will not run correcttly.

smp_call_function will run functions on all other CPUs, but not include
himself, this is not correct,use on_each_cpu instead to fix this issue.

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Shawn Guo <shawn.guo@...aro.org>
Cc: Arnd Bergmann <arnd@...db.de>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Acked-by: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Jason Liu <r64343@...escale.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/kernel/smp_twd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 49f335d..64ac3f1 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -121,7 +121,7 @@ static int twd_rate_change(struct notifier_block *nb,
 	 * changing cpu.
 	 */
 	if (flags == POST_RATE_CHANGE)
-		smp_call_function(twd_update_frequency,
+		on_each_cpu(twd_update_frequency,
 				  (void *)&cnd->new_rate, 1);
 
 	return NOTIFY_OK;
-- 
1.8.1.2

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