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authorPeter Zijlstra <peterz@infradead.org>2015-03-19 09:39:08 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-27 09:45:09 +0100
commitf09cb9a1808e35ad7502ea39b6bfb443c7fa0f19 (patch)
tree1a172f02117de052a2de202b8db41e32e76b1d15 /kernel
parent4498e7467e9e441c18ca12f1ca08460356e0508a (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/timekeeping.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 278373edb472..c3fcff06d30a 100644
--- 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);
}
/**