[tip:sched/core] timers/posix-timers: Use TICK_NSEC instead of a dynamically ad-hoc calculated version

[tip-bot for Frederic Weisbecker]

Commit-ID:  715eb7a9243a058a0722aa2f6ba703ede9113e76
Gitweb:     http://git.kernel.org/tip/715eb7a9243a058a0722aa2f6ba703ede9113e76
Author:     Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Tue, 31 Jan 2017 04:09:33 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 1 Feb 2017 09:13:54 +0100

timers/posix-timers: Use TICK_NSEC instead of a dynamically ad-hoc calculated version

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1485832191-26889-18-git-send-email-fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/time/posix-cpu-timers.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index d53ff71..8349e02 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -890,8 +890,6 @@ static inline void stop_process_timers(struct signal_struct *sig)
 	tick_dep_clear_signal(sig, TICK_DEP_BIT_POSIX_TIMER);
 }
 
-static u32 onecputick;
-
 static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
 			     unsigned long long *expires,
 			     unsigned long long cur_time, int signo)
@@ -903,9 +901,9 @@ static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
 		if (it->incr) {
 			it->expires += it->incr;
 			it->error += it->incr_error;
-			if (it->error >= onecputick) {
+			if (it->error >= TICK_NSEC) {
 				it->expires -= cputime_one_jiffy;
-				it->error -= onecputick;
+				it->error -= TICK_NSEC;
 			}
 		} else {
 			it->expires = 0;
@@ -1476,15 +1474,10 @@ static __init int init_posix_cpu_timers(void)
 		.clock_get	= thread_cpu_clock_get,
 		.timer_create	= thread_cpu_timer_create,
 	};
-	struct timespec ts;
 
 	posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process);
 	posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread);
 
-	cputime_to_timespec(cputime_one_jiffy, &ts);
-	onecputick = ts.tv_nsec;
-	WARN_ON(ts.tv_sec != 0);
-
 	return 0;
 }
 __initcall(init_posix_cpu_timers);