linux-kernel - [tip: timers/core] posix-timers: Make timer

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Message-ID: <157900693801.396.4434514969684868264.tip-bot2@tip-bot2>
Date:   Tue, 14 Jan 2020 13:02:18 -0000
From:   "tip-bot2 for Andrei Vagin" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Andrei Vagin <avagin@...nvz.org>, Dmitry Safonov <dima@...sta.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
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
Gitweb:        https://git.kernel.org/tip/7da8b3a44bb426a43670b3a97ed61085018a9d43
Author:        Andrei Vagin <avagin@...il.com>
AuthorDate:    Tue, 12 Nov 2019 01:27:03 
Committer:     Thomas Gleixner <tglx@...utronix.de>
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
converted.

Co-developed-by: Dmitry Safonov <dima@...sta.com>
Signed-off-by: Andrei Vagin <avagin@...nvz.org>
Signed-off-by: Dmitry Safonov <dima@...sta.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.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);