Commit 7da8b3a4 authored Nov 12, 2019 by Andrei Vagin Committed by Thomas Gleixner Jan 14, 2020

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
converted.

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-15-dima@arista.com

parent 6cd889d4

kernel/time/posix-timers.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);

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