[lkml]   [2020]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[tip: timers/core] posix-timers: Make timer_settime() time namespace aware
The following commit has been merged into the timers/core branch of tip:

Commit-ID: 7da8b3a44bb426a43670b3a97ed61085018a9d43
Author: Andrei Vagin <>
AuthorDate: Tue, 12 Nov 2019 01:27:03
Committer: Thomas Gleixner <>
CommitterDate: Tue, 14 Jan 2020 12:20:54 +01:00

posix-timers: Make timer_settime() time namespace aware

Wire timer_settime() syscall into time namespace virtualization.

sys_timer_settime() calls the ktime->timer_set() callback. Right now,
common_timer_set() is the only implementation for the callback.

The user-supplied expiry value is converted from timespec64 to ktime and
then timens_ktime_to_host() can be used to convert namespace's time to the
host time.

Inside a time namespace kernel's time differs by a fixed offset from a
user-supplied time, but only absolute values (TIMER_ABSTIME) must be

Co-developed-by: Dmitry Safonov <>
Signed-off-by: Andrei Vagin <>
Signed-off-by: Dmitry Safonov <>
Signed-off-by: Thomas Gleixner <>

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

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index d26b915..473082b 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -885,6 +885,8 @@ int common_timer_set(struct k_itimer *timr, int flags,

timr->it_interval = timespec64_to_ktime(new_setting->it_interval);
expires = timespec64_to_ktime(new_setting->it_value);
+ if (flags & TIMER_ABSTIME)
+ expires = timens_ktime_to_host(timr->it_clock, expires);
sigev_none = timr->it_sigev_notify == SIGEV_NONE;

kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none);
 \ /
  Last update: 2020-01-14 14:04    [W:0.340 / U:3.572 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site