On 5/28/19 6:04 AM, Vincenzo Frascino wrote:

clock_getres in the vDSO library has to preserve the same behaviour
of posix_get_hrtimer_res().

In particular, posix_get_hrtimer_res() does:
     sec = 0;
     ns = hrtimer_resolution;
and hrtimer_resolution depends on the enablement of the high
resolution timers that can happen either at compile or at run time.

Fix the s390 vdso implementation of clock_getres keeping a copy of
hrtimer_resolution in vdso data and using that directly.

Cc: Martin Schwidefsky <redacted>
Cc: Heiko Carstens <redacted>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Martin Schwidefsky <redacted>
---

Note: This patch is independent from the others in this series, hence it
can be merged singularly by the s390 maintainers.

Acked-by: Shuah Khan <skhan@linuxfoundation.org>

thanks,
-- Shuah