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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-11 05:01:52 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-13 23:49:36 +0100
commitaffe3e85ae78507cc953f3f700e0644e50844cff (patch)
tree7f29d6565dc433a42492187537d7473b192652f1 /kernel
parent3810631332465d967ba5e27ea2c7dff2c9afac6c (diff)
timekeeping: Pass readout base to update_fast_timekeeper()
Modify update_fast_timekeeper() to take a struct tk_read_base pointer as its argument (instead of a struct timekeeper pointer) and update its kerneldoc comment to reflect that. That will allow a struct tk_read_base that is not part of a struct timekeeper to be passed to it in the next patch. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/timekeeping.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index b124af259800..abf08f4366c1 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -230,9 +230,7 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
/**
* update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper.
- * @tk: The timekeeper from which we take the update
- * @tkf: The fast timekeeper to update
- * @tbase: The time base for the fast timekeeper (mono/raw)
+ * @tkr: Timekeeping readout base from which we take the update
*
* We want to use this from any context including NMI and tracing /
* instrumenting the timekeeping code itself.
@@ -244,11 +242,11 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
* smp_wmb(); <- Ensure that the last base[1] update is visible
* tkf->seq++;
* smp_wmb(); <- Ensure that the seqcount update is visible
- * update(tkf->base[0], tk);
+ * update(tkf->base[0], tkr);
* smp_wmb(); <- Ensure that the base[0] update is visible
* tkf->seq++;
* smp_wmb(); <- Ensure that the seqcount update is visible
- * update(tkf->base[1], tk);
+ * update(tkf->base[1], tkr);
*
* The reader side does:
*
@@ -269,7 +267,7 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
* slightly wrong timestamp (a few nanoseconds). See
* @ktime_get_mono_fast_ns.
*/
-static void update_fast_timekeeper(struct timekeeper *tk)
+static void update_fast_timekeeper(struct tk_read_base *tkr)
{
struct tk_read_base *base = tk_fast_mono.base;
@@ -277,7 +275,7 @@ static void update_fast_timekeeper(struct timekeeper *tk)
raw_write_seqcount_latch(&tk_fast_mono.seq);
/* Update base[0] */
- memcpy(base, &tk->tkr, sizeof(*base));
+ memcpy(base, tkr, sizeof(*base));
/* Force readers back to base[0] */
raw_write_seqcount_latch(&tk_fast_mono.seq);
@@ -462,7 +460,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
memcpy(&shadow_timekeeper, &tk_core.timekeeper,
sizeof(tk_core.timekeeper));
- update_fast_timekeeper(tk);
+ update_fast_timekeeper(&tk->tkr);
}
/**