[PATCH v2 04/28] kernel: Add masks support for Raw and NTP time

Vincenzo Frascino
2018-11-29T17:07:07Z

Depending on the clocksource selected there can be supported a
different resolution hence we require a mask to be applied to the
time calculation.

This patch exposes the mask in the datapage for Raw and NTP adjusted
clock.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
include/vdso/datapage.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index d50a108afaed..0a7bdccf5773 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -34,6 +34,8 @@ struct vdso_data {
__u64 wtm_clock_nsec;
__u64 btm_nsec; /* Monotonic to boot time */
__u64 tai_sec; /* International Atomic Time */
+ __u64 cs_mono_mask; /* NTP-adjusted clocksource mask */
+ __u64 cs_raw_mask; /* Raw clocksource mask */
__u32 tb_seq_count; /* Timebase sequence counter */
__u32 cs_mono_mult; /* NTP-adjusted clocksource multiplier */
__u32 cs_shift; /* Clocksource shift (mono = raw) */