s390/time: avoid races when updating tb_update_count

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The increment might not be atomic and we're not holding the
timekeeper_lock. Therefore we might lose an update to count, resulting in
VDSO being trapped in a loop. As other archs also simply update the
values and count doesn't seem to have an impact on reloading of these
values in VDSO code, let's just remove the update of tb_update_count.

Suggested-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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David Hildenbrand 2016-07-18 17:10:17 +02:00 • committed by Martin Schwidefsky

parent 0c00b1e00b

commit 67f03de5f0

1 changed files with 0 additions and 5 deletions

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arch/s390/kernel/time.c

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