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| author | Ingo Molnar <mingo@elte.hu> | 2006-02-14 13:53:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-14 16:09:35 -0800 |
| commit | 06027bdd278a32a84b273e41db68a5db8ffd2bb6 (patch) | |
| tree | d22c98848c3964104fc5c617da60c14af5b4a1f0 /kernel | |
| parent | e35a6619e7be59aa38249346327c89207663bb37 (diff) | |
| download | lwn-06027bdd278a32a84b273e41db68a5db8ffd2bb6.tar.gz lwn-06027bdd278a32a84b273e41db68a5db8ffd2bb6.zip | |
[PATCH] hrtimer: round up relative start time on low-res arches
CONFIG_TIME_LOW_RES is a temporary way for architectures to signal that
they simply return xtime in do_gettimeoffset(). In this corner-case we
want to round up by resolution when starting a relative timer, to avoid
short timeouts. This will go away with the GTOD framework.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/hrtimer.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 2b6e1757aedd..5ae51f1bc7c8 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -418,8 +418,19 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) /* Switch the timer base, if necessary: */ new_base = switch_hrtimer_base(timer, base); - if (mode == HRTIMER_REL) + if (mode == HRTIMER_REL) { tim = ktime_add(tim, new_base->get_time()); + /* + * CONFIG_TIME_LOW_RES is a temporary way for architectures + * to signal that they simply return xtime in + * do_gettimeoffset(). In this case we want to round up by + * resolution when starting a relative timer, to avoid short + * timeouts. This will go away with the GTOD framework. + */ +#ifdef CONFIG_TIME_LOW_RES + tim = ktime_add(tim, base->resolution); +#endif + } timer->expires = tim; enqueue_hrtimer(timer, new_base); |