linux-kernel - [ 63/72] ARM: 7778/1: smp_twd: twd_update_frequency need be run on all online CPUs

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Message-Id: <20130719052604.175456121@linuxfoundation.org>
Date:	Thu, 18 Jul 2013 22:26:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, 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>
Subject: [ 63/72] ARM: 7778/1: smp_twd: twd_update_frequency need be run on all online CPUs

3.10-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.

Acked-by: Linus Walleij <linus.walleij@...aro.org>
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: 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/kernel/smp_twd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -120,7 +120,7 @@ static int twd_rate_change(struct notifi
 	 * 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;


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