This is a note to let you know that I've just added the patch titled
parisc: Fix automatic selection of cr16 clocksource
to the 4.7-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-automatic-selection-of-cr16-clocksource.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ae141830b118c3fb5b7eab6fa7c8ab7b7224b0a4 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 19 Aug 2016 22:39:02 +0200
Subject: parisc: Fix automatic selection of cr16 clocksource
From: Helge Deller <deller@xxxxxx>
commit ae141830b118c3fb5b7eab6fa7c8ab7b7224b0a4 upstream.
Commit 54b66800907 (parisc: Add native high-resolution sched_clock()
implementation) added support to use the CPU-internal cr16 counters as reliable
clocksource with the help of HAVE_UNSTABLE_SCHED_CLOCK.
Sadly the commit missed to remove the hack which prevented cr16 to become the
default clocksource even on SMP systems.
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/processor.c | 8 --------
arch/parisc/kernel/time.c | 12 ------------
2 files changed, 20 deletions(-)
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -51,8 +51,6 @@ EXPORT_SYMBOL(_parisc_requires_coherency
DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
-extern int update_cr16_clocksource(void); /* from time.c */
-
/*
** PARISC CPU driver - claim "device" and initialize CPU data structures.
**
@@ -228,12 +226,6 @@ static int processor_probe(struct parisc
}
#endif
- /* If we've registered more than one cpu,
- * we'll use the jiffies clocksource since cr16
- * is not synchronized between CPUs.
- */
- update_cr16_clocksource();
-
return 0;
}
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -220,18 +220,6 @@ static struct clocksource clocksource_cr
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-int update_cr16_clocksource(void)
-{
- /* since the cr16 cycle counters are not synchronized across CPUs,
- we'll check if we should switch to a safe clocksource: */
- if (clocksource_cr16.rating != 0 && num_online_cpus() > 1) {
- clocksource_change_rating(&clocksource_cr16, 0);
- return 1;
- }
-
- return 0;
-}
-
void __init start_cpu_itimer(void)
{
unsigned int cpu = smp_processor_id();
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-4.7/parisc-fix-order-of-erefused-define-in-errno.h.patch
queue-4.7/parisc-fix-automatic-selection-of-cr16-clocksource.patch
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