[tip: timers/core] alarmtimer: Make nanosleep() time namespace aware

[tip-bot2 for Andrei Vagin]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     a27f00cd18d392fadcaca463506303ab668a6891
Gitweb:        https://git.kernel.org/tip/a27f00cd18d392fadcaca463506303ab668a6891
Author:        Andrei Vagin <avagin@xxxxxxxxx>
AuthorDate:    Tue, 12 Nov 2019 01:27:04 
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Mon, 13 Jan 2020 08:10:52 +01:00

alarmtimer: Make nanosleep() time namespace aware

clock_nanosleep() accepts absolute values of expiration time when the
TIMER_ABSTIME flag is set. This absolute value is inside the task's
time namespace and has to be converted to the host's time.

Co-developed-by: Dmitry Safonov <dima@xxxxxxxxxx>
Signed-off-by: Andrei Vagin <avagin@xxxxxxxxxx>
Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191112012724.250792-16-dima@xxxxxxxxxx

---
 kernel/time/alarmtimer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 9a8e81b..b51b36e 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -839,6 +839,8 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
 		ktime_t now = alarm_bases[type].get_ktime();
 
 		exp = ktime_add_safe(now, exp);
+	} else {
+		exp = timens_ktime_to_host(which_clock, exp);
 	}
 
 	ret = alarmtimer_do_nsleep(&alarm, exp, type);