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| author | Xunlei Pang <pang.xunlei@linaro.org> | 2015-04-02 06:34:25 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-03 09:18:22 +0300 |
| commit | a0c2998f918e7e597d3c686c5f3d5a30d0382dd6 (patch) | |
| tree | 3463441c1ca89e84d63ccf89caad4156a05cce1a /drivers/clocksource | |
| parent | a451570c008b9e19592e29f15cfd295bdf818c7a (diff) | |
| download | linux-a0c2998f918e7e597d3c686c5f3d5a30d0382dd6.tar.xz | |
clocksource/drivers/tegra: Provide y2038-safe tegra_read_persistent_clock() replacement
As part of addressing "y2038 problem" for in-kernel uses, this
patch adds the y2038-safe tegra_read_persistent_clock64() using
timespec64.
Because we rely on some subsequent changes to convert arm
multiarch support, tegra_read_persistent_clock() will be removed
then.
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1427945681-29972-6-git-send-email-john.stultz@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/tegra20_timer.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c index d8a3a4eb9f97..4a0a603edecc 100644 --- a/drivers/clocksource/tegra20_timer.c +++ b/drivers/clocksource/tegra20_timer.c @@ -51,7 +51,7 @@ static void __iomem *timer_reg_base; static void __iomem *rtc_base; -static struct timespec persistent_ts; +static struct timespec64 persistent_ts; static u64 persistent_ms, last_persistent_ms; static struct delay_timer tegra_delay_timer; @@ -120,26 +120,33 @@ static u64 tegra_rtc_read_ms(void) } /* - * tegra_read_persistent_clock - Return time from a persistent clock. + * tegra_read_persistent_clock64 - Return time from a persistent clock. * * Reads the time from a source which isn't disabled during PM, the * 32k sync timer. Convert the cycles elapsed since last read into - * nsecs and adds to a monotonically increasing timespec. + * nsecs and adds to a monotonically increasing timespec64. * Care must be taken that this funciton is not called while the * tegra_rtc driver could be executing to avoid race conditions * on the RTC shadow register */ -static void tegra_read_persistent_clock(struct timespec *ts) +static void tegra_read_persistent_clock64(struct timespec64 *ts) { u64 delta; - struct timespec *tsp = &persistent_ts; last_persistent_ms = persistent_ms; persistent_ms = tegra_rtc_read_ms(); delta = persistent_ms - last_persistent_ms; - timespec_add_ns(tsp, delta * NSEC_PER_MSEC); - *ts = *tsp; + timespec64_add_ns(&persistent_ts, delta * NSEC_PER_MSEC); + *ts = persistent_ts; +} + +static void tegra_read_persistent_clock(struct timespec *ts) +{ + struct timespec ts64; + + tegra_read_persistent_clock64(&ts64); + *ts = timespec64_to_timespec(ts64); } static unsigned long tegra_delay_timer_read_counter_long(void) |