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time/sched_clock: Swap update_clock_read_data() latch writes

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Swap the writes to the odd and even copies to make the writer critical
section look like all other seqcount_latch writers.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241104161910.780003-2-elver@google.com
This commit is contained in:
Marco Elver 2024-11-04 16:43:05 +01:00 committed by Peter Zijlstra
parent 25cf4fbb59
commit 1139c71df5
1 changed files with 3 additions and 3 deletions
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6
kernel/time/sched_clock.c
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@ -119,9 +119,6 @@ unsigned long long notrace sched_clock(void)
*/
static void update_clock_read_data(struct clock_read_data *rd)
{
/* update the backup (odd) copy with the new data */
cd.read_data[1] = *rd;
/* steer readers towards the odd copy */
raw_write_seqcount_latch(&cd.seq);
@ -130,6 +127,9 @@ static void update_clock_read_data(struct clock_read_data *rd)
/* switch readers back to the even copy */
raw_write_seqcount_latch(&cd.seq);
/* update the backup (odd) copy with the new data */
cd.read_data[1] = *rd;
}
/*