This is a note to let you know that I've just added the patch titled
ARM: 7466/1: disable interrupt before spinning endlessly
to the 3.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7466-1-disable-interrupt-before-spinning-endlessly.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 98bd8b96b26db3399a48202318dca4aaa2515355 Mon Sep 17 00:00:00 2001
From: Shawn Guo <[email protected]>
Date: Fri, 13 Jul 2012 08:19:34 +0100
Subject: ARM: 7466/1: disable interrupt before spinning endlessly
From: Shawn Guo <[email protected]>
commit 98bd8b96b26db3399a48202318dca4aaa2515355 upstream.
The CPU will endlessly spin at the end of machine_halt and
machine_restart calls. However, this will lead to a soft lockup
warning after about 20 seconds, if CONFIG_LOCKUP_DETECTOR is enabled,
as system timer is still alive.
Disable interrupt before going to spin endlessly, so that the lockup
warning will never be seen.
Reported-by: Marek Vasut <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm/kernel/process.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -247,6 +247,7 @@ void machine_shutdown(void)
void machine_halt(void)
{
machine_shutdown();
+ local_irq_disable();
while (1);
}
@@ -268,6 +269,7 @@ void machine_restart(char *cmd)
/* Whoops - the platform was unable to reboot. Tell the user! */
printk("Reboot failed -- System halted\n");
+ local_irq_disable();
while (1);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.5/arm-7466-1-disable-interrupt-before-spinning-endlessly.patch
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