time: Introduce tk_fast_raw

Add the NMI safe CLOCK_MONOTONIC_RAW accessor..

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/20150319093400.562746929@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 3eaae47..f36b1ed 100644 (file)
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -220,6 +220,7 @@ static inline u64 ktime_get_raw_ns(void)
 }
 
 extern u64 ktime_get_mono_fast_ns(void);
+extern u64 ktime_get_raw_fast_ns(void);
 
 /*
  * Timespec interfaces utilizing the ktime based ones

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 278373e..c3fcff0 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -59,6 +59,7 @@ struct tk_fast {
 };
 
 static struct tk_fast tk_fast_mono ____cacheline_aligned;
+static struct tk_fast tk_fast_raw  ____cacheline_aligned;
 
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
@@ -434,6 +435,12 @@ u64 ktime_get_mono_fast_ns(void)
 }
 EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
 
+u64 ktime_get_raw_fast_ns(void)
+{
+       return __ktime_get_fast_ns(&tk_fast_raw);
+}
+EXPORT_SYMBOL_GPL(ktime_get_raw_fast_ns);
+
 /* Suspend-time cycles value for halted fast timekeeper. */
 static cycle_t cycles_at_suspend;
 
@@ -461,6 +468,11 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
        cycles_at_suspend = tkr->read(tkr->clock);
        tkr_dummy.read = dummy_clock_read;
        update_fast_timekeeper(&tkr_dummy, &tk_fast_mono);
+
+       tkr = &tk->tkr_raw;
+       memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
+       tkr_dummy.read = dummy_clock_read;
+       update_fast_timekeeper(&tkr_dummy, &tk_fast_raw);
 }
 
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
@@ -592,6 +604,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
                       sizeof(tk_core.timekeeper));
 
        update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
+       update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
 }
 
 /**