Patch "parisc: Suspend lockup detectors before system halt" has been added to the 4.12-stable tree

Patch "parisc: Suspend lockup detectors before system halt" has been added to the 4.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    parisc: Suspend lockup detectors before system halt

to the 4.12-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:
     parisc-suspend-lockup-detectors-before-system-halt.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 56188832a50f09998cb570ba3771a1d25c193c0e Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Tue, 25 Jul 2017 21:41:41 +0200
Subject: parisc: Suspend lockup detectors before system halt

From: Helge Deller <deller@gmx.de>

commit 56188832a50f09998cb570ba3771a1d25c193c0e upstream.

Some machines can't power off the machine, so disable the lockup detectors to
avoid this watchdog BUG to show up every few seconds:
watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd-shutdow:1]

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/kernel/process.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -53,6 +53,7 @@
 #include <linux/uaccess.h>
 #include <linux/rcupdate.h>
 #include <linux/random.h>
+#include <linux/nmi.h>
 
 #include <asm/io.h>
 #include <asm/asm-offsets.h>
@@ -145,6 +146,7 @@ void machine_power_off(void)
 
 	/* prevent soft lockup/stalled CPU messages for endless loop. */
 	rcu_sysrq_start();
+	lockup_detector_suspend();
 	for (;;);
 }
 


Patches currently in stable-queue which might be from deller@gmx.de are

queue-4.12/parisc-suspend-lockup-detectors-before-system-halt.patch
queue-4.12/parisc-prevent-tlb-speculation-on-flushed-pages-on-cpus-that-only-support-equivalent-aliases.patch
queue-4.12/parisc-extend-disabled-preemption-in-copy_user_page.patch