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    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: d1ba7dda1bc0129bc8f85bff530748aef1e99e70
    Gitweb: https://git.kernel.org/tip/d1ba7dda1bc0129bc8f85bff530748aef1e99e70
    Author: Andrei Vagin <avagin@gmail.com>
    AuthorDate: Tue, 12 Nov 2019 01:27:03
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitterDate: Mon, 13 Jan 2020 08:10:52 +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
    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

    ---
    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);
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