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Subject[PATCH RESEND] ARM: sched: correct update_sched_clock()
Date
If we want load epoch_cyc and epoch_ns atomically,
we should update epoch_cyc_copy first of all.
This notify reader that updating is in progress.

If we update epoch_cyc first like as current implementation,
there is subtle error case.
Look at the below example.

<Initial Condition>
cyc = 9
ns = 900
cyc_copy = 9

== CASE 1 ==
<CPU A = reader> <CPU B = updater>
write cyc = 10
read cyc = 10
read ns = 900
write ns = 1000
write cyc_copy = 10
read cyc_copy = 10

output = (10, 900)

== CASE 2 ==
<CPU A = reader> <CPU B = updater>
read cyc = 9
write cyc = 10
write ns = 1000
read ns = 1000
read cyc_copy = 9
write cyc_copy = 10
output = (9, 1000)

If atomic read is ensured, output should be (9, 900) or (10, 1000).
But, output in example case are not.

So, change updating sequence in order to correct this problem.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
index fc6692e..bd6f56b 100644
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -93,11 +93,11 @@ static void notrace update_sched_clock(void)
* detectable in cyc_to_fixed_sched_clock().
*/
raw_local_irq_save(flags);
- cd.epoch_cyc = cyc;
+ cd.epoch_cyc_copy = cyc;
smp_wmb();
cd.epoch_ns = ns;
smp_wmb();
- cd.epoch_cyc_copy = cyc;
+ cd.epoch_cyc = cyc;
raw_local_irq_restore(flags);
}

--
1.7.9.5


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