Patch "parisc: Avoid stalled CPU warnings after system shutdown" has been added to the 4.9-stable tree

Patch "parisc: Avoid stalled CPU warnings after system shutdown" has been added to the 4.9-stable tree

[gregkh]

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

    parisc: Avoid stalled CPU warnings after system shutdown

to the 4.9-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-avoid-stalled-cpu-warnings-after-system-shutdown.patch
and it can be found in the queue-4.9 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 476e75a44b56038bee9207242d4bc718f6b4de06 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Wed, 29 Mar 2017 08:25:30 +0200
Subject: parisc: Avoid stalled CPU warnings after system shutdown

From: Helge Deller <deller@gmx.de>

commit 476e75a44b56038bee9207242d4bc718f6b4de06 upstream.

Commit 73580dac7618 ("parisc: Fix system shutdown halt") introduced an endless
loop for systems which don't provide a software power off function.  But the
soft lockup detector will detect this and report stalled CPUs after some time.
Avoid those unwanted warnings by disabling the soft lockup detector.

Fixes: 73580dac7618 ("parisc: Fix system shutdown halt")
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
@@ -140,6 +140,8 @@ void machine_power_off(void)
 	printk(KERN_EMERG "System shut down completed.\n"
 	       "Please power this system off now.");
 
+	/* prevent soft lockup/stalled CPU messages for endless loop. */
+	rcu_sysrq_start();
 	for (;;);
 }
 


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

queue-4.9/parisc-fix-access-fault-handling-in-pa_memcpy.patch
queue-4.9/parisc-clean-up-fixup-routines-for-get_user-put_user.patch
queue-4.9/parisc-avoid-stalled-cpu-warnings-after-system-shutdown.patch