Patch "parisc: Fix self-detected CPU stall warnings on Mako machines" has been added to the 4.8-stable tree

Patch "parisc: Fix self-detected CPU stall warnings on Mako machines" has been added to the 4.8-stable tree

[gregkh]

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

    parisc: Fix self-detected CPU stall warnings on Mako machines

to the 4.8-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-fix-self-detected-cpu-stall-warnings-on-mako-machines.patch
and it can be found in the queue-4.8 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 92420bd0d01f040bbf754e1d090be49ca6a1c8d6 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Sat, 24 Sep 2016 22:22:12 +0200
Subject: parisc: Fix self-detected CPU stall warnings on Mako machines

From: Helge Deller <deller@gmx.de>

commit 92420bd0d01f040bbf754e1d090be49ca6a1c8d6 upstream.

The config option HAVE_UNSTABLE_SCHED_CLOCK is set automatically when compiling
for SMP. There is no need to clear the stable-clock flag via
clear_sched_clock_stable() when starting secondary CPUs, and even worse,
clearing it triggers wrong self-detected CPU stall warnings on 64bit Mako
machines.

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

---
 arch/parisc/kernel/time.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -226,12 +226,6 @@ void __init start_cpu_itimer(void)
 	unsigned int cpu = smp_processor_id();
 	unsigned long next_tick = mfctl(16) + clocktick;
 
-#if defined(CONFIG_HAVE_UNSTABLE_SCHED_CLOCK) && defined(CONFIG_64BIT)
-	/* With multiple 64bit CPUs online, the cr16's are not syncronized. */
-	if (cpu != 0)
-		clear_sched_clock_stable();
-#endif
-
 	mtctl(next_tick, 16);		/* kick off Interval Timer (CR16) */
 
 	per_cpu(cpu_data, cpu).it_value = next_tick;


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

queue-4.8/parisc-fix-kernel-memory-layout-regarding-position-of-__gp.patch
queue-4.8/parisc-increase-initial-kernel-mapping-size.patch
queue-4.8/parisc-increase-kernel_initial_size-for-32-bit-smp-kernels.patch
queue-4.8/parisc-fix-self-detected-cpu-stall-warnings-on-mako-machines.patch