Patch "parisc: Fix detection of nonsynchronous cr16 cycle counters" has been added to the 4.13-stable tree

[<gregkh@linuxfoundation.org>]

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

    parisc: Fix detection of nonsynchronous cr16 cycle counters

to the 4.13-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-detection-of-nonsynchronous-cr16-cycle-counters.patch
and it can be found in the queue-4.13 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 8642b31ba9eef8a01845146a26682d4869e62513 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Wed, 18 Oct 2017 22:25:00 +0200
Subject: parisc: Fix detection of nonsynchronous cr16 cycle counters

From: Helge Deller <deller@gmx.de>

commit 8642b31ba9eef8a01845146a26682d4869e62513 upstream.

For CPUs which have an unknown or invalid CPU location (physical location)
assume that their cycle counters aren't syncronized across CPUs.

Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: c8c3735997a3 ("parisc: Enhance detection of synchronous cr16 clocksources")
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/kernel/time.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -253,7 +253,10 @@ static int __init init_cr16_clocksource(
 		cpu0_loc = per_cpu(cpu_data, 0).cpu_loc;
 
 		for_each_online_cpu(cpu) {
-			if (cpu0_loc == per_cpu(cpu_data, cpu).cpu_loc)
+			if (cpu == 0)
+				continue;
+			if ((cpu0_loc != 0) &&
+			    (cpu0_loc == per_cpu(cpu_data, cpu).cpu_loc))
 				continue;
 
 			clocksource_cr16.name = "cr16_unstable";


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

queue-4.13/parisc-fix-detection-of-nonsynchronous-cr16-cycle-counters.patch
queue-4.13/parisc-fix-double-word-compare-and-exchange-in-lws-code-on-32-bit-kernels.patch