Patch "parisc: Use cr16 interval timers unconditionally on qemu" has been added to the 4.14-stable tree

Patch "parisc: Use cr16 interval timers unconditionally on qemu" has been added to the 4.14-stable tree

[gregkh]

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

    parisc: Use cr16 interval timers unconditionally on qemu

to the 4.14-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-use-cr16-interval-timers-unconditionally-on-qemu.patch
and it can be found in the queue-4.14 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 5ffa8518851f1401817c15d2a7eecc0373c26ff9 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Fri, 12 Jan 2018 22:44:00 +0100
Subject: parisc: Use cr16 interval timers unconditionally on qemu

From: Helge Deller <deller@gmx.de>

commit 5ffa8518851f1401817c15d2a7eecc0373c26ff9 upstream.

When running on qemu we know that the (emulated) cr16 cpu-internal
clocks are syncronized. So let's use them unconditionally on qemu.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # 4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/include/asm/processor.h |    2 ++
 arch/parisc/kernel/time.c           |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/arch/parisc/include/asm/processor.h
+++ b/arch/parisc/include/asm/processor.h
@@ -316,6 +316,8 @@ extern int _parisc_requires_coherency;
 #define parisc_requires_coherency()	(0)
 #endif
 
+extern int running_on_qemu;
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_PARISC_PROCESSOR_H */
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -248,7 +248,7 @@ static int __init init_cr16_clocksource(
 	 * different sockets, so mark them unstable and lower rating on
 	 * multi-socket SMP systems.
 	 */
-	if (num_online_cpus() > 1) {
+	if (num_online_cpus() > 1 && !running_on_qemu) {
 		int cpu;
 		unsigned long cpu0_loc;
 		cpu0_loc = per_cpu(cpu_data, 0).cpu_loc;


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

queue-4.14/parisc-use-cr16-interval-timers-unconditionally-on-qemu.patch
queue-4.14/parisc-fix-ordering-of-cache-and-tlb-flushes.patch
queue-4.14/parisc-reduce-irq-overhead-when-run-in-qemu.patch