This is a note to let you know that I've just added the patch titled
clocksource: vf_pit_timer: use complement for sched_clock reading
to the 3.13-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:
clocksource-vf_pit_timer-use-complement-for-sched_clock-reading.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 224aa3ed45c8735ae02bb2ecca002409fa6aa772 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@xxxxxxxx>
Date: Wed, 5 Mar 2014 23:11:08 +0100
Subject: clocksource: vf_pit_timer: use complement for sched_clock reading
From: Stefan Agner <stefan@xxxxxxxx>
commit 224aa3ed45c8735ae02bb2ecca002409fa6aa772 upstream.
Vybrids PIT register is monitonic decreasing. However, sched_clock
reading needs to be monitonic increasing. Use bitwise not to get
the complement of the clock register. This fixes the clock going
backward. Also, the clock now starts at 0 since we load the
register with the maximum value at start.
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Acked-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
Cc: daniel.lezcano@xxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux@xxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/d25af915993aec1b486be653eb86f748ddef54fe.1394057313.git.stefan@xxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/vf_pit_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/clocksource/vf_pit_timer.c
+++ b/drivers/clocksource/vf_pit_timer.c
@@ -54,7 +54,7 @@ static inline void pit_irq_acknowledge(v
static u64 pit_read_sched_clock(void)
{
- return __raw_readl(clksrc_base + PITCVAL);
+ return ~__raw_readl(clksrc_base + PITCVAL);
}
static int __init pit_clocksource_init(unsigned long rate)
Patches currently in stable-queue which might be from stefan@xxxxxxxx are
queue-3.13/clocksource-vf_pit_timer-use-complement-for-sched_clock-reading.patch
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