time: Parametrize all tk_fast_mono users

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>

1 files changed, 15 insertions, 10 deletions

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index cbb612ee813f..278373edb472 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -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);
 }
 
 /**