mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-11-04 10:40:15 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

time: Parametrize all tk_fast_mono users

Browse source 
In preparation for more tk_fast instances, remove all hard-coded
tk_fast_mono references.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150319093400.484279927@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-03-19 09:36:19 +01:00 committed by Ingo Molnar
parent 4a4ad80d32
commit 4498e7467e
1 changed files with 15 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

25
kernel/time/timekeeping.c
View file

@ -364,18 +364,18 @@ static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
* slightly wrong timestamp (a few nanoseconds). See
* @ktime_get_mono_fast_ns.
*/
static void update_fast_timekeeper(struct tk_read_base *tkr)
static void update_fast_timekeeper(struct tk_read_base *tkr, struct tk_fast *tkf)
{
struct tk_read_base *base = tk_fast_mono.base;
struct tk_read_base *base = tkf->base;
/* Force readers off to base[1] */
raw_write_seqcount_latch(&tk_fast_mono.seq);
raw_write_seqcount_latch(&tkf->seq);
/* Update base[0] */
memcpy(base, tkr, sizeof(*base));
/* Force readers back to base[0] */
raw_write_seqcount_latch(&tk_fast_mono.seq);
raw_write_seqcount_latch(&tkf->seq);
/* Update base[1] */
memcpy(base + 1, base, sizeof(*base));
@ -413,20 +413,25 @@ static void update_fast_timekeeper(struct tk_read_base *tkr)
* of the following timestamps. Callers need to be aware of that and
* deal with it.
*/
u64 notrace ktime_get_mono_fast_ns(void)
static __always_inline u64 __ktime_get_fast_ns(struct tk_fast *tkf)
{
struct tk_read_base *tkr;
unsigned int seq;
u64 now;
do {
seq = raw_read_seqcount(&tk_fast_mono.seq);
tkr = tk_fast_mono.base + (seq & 0x01);
seq = raw_read_seqcount(&tkf->seq);
tkr = tkf->base + (seq & 0x01);
now = ktime_to_ns(tkr->base) + timekeeping_get_ns(tkr);
} while (read_seqcount_retry(&tkf->seq, seq));
} while (read_seqcount_retry(&tk_fast_mono.seq, seq));
return now;
}
u64 ktime_get_mono_fast_ns(void)
{
return __ktime_get_fast_ns(&tk_fast_mono);
}
EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
/* Suspend-time cycles value for halted fast timekeeper. */
@ -455,7 +460,7 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
cycles_at_suspend = tkr->read(tkr->clock);
tkr_dummy.read = dummy_clock_read;
update_fast_timekeeper(&tkr_dummy);
update_fast_timekeeper(&tkr_dummy, &tk_fast_mono);
}
#ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
@ -586,7 +591,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
memcpy(&shadow_timekeeper, &tk_core.timekeeper,
sizeof(tk_core.timekeeper));
update_fast_timekeeper(&tk->tkr_mono);
update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
}
/**