time: Add do_timens_ktime_to_host() helper
authorAndrei Vagin <avagin@gmail.com>
Tue, 12 Nov 2019 01:27:01 +0000 (01:27 +0000)
committerThomas Gleixner <tglx@linutronix.de>
Tue, 14 Jan 2020 11:20:53 +0000 (12:20 +0100)
commit89dd8eecfe961fab4924dcd14f80cf2ab2820044
treefcc408a7d8f1bc04818a7ef436791e14d8a38092
parent5a590f35add93c2bdf3ed83eee73111021679562
time: Add do_timens_ktime_to_host() helper

The helper subtracts namespace's clock offset from the given time
and ensures that the result is within [0, KTIME_MAX].

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-13-dima@arista.com
include/linux/time_namespace.h
kernel/time/namespace.c