* Xunlei Pang <xlpang@xxxxxxx> [150310 20:18]:
> From: Xunlei Pang <pang.xunlei@xxxxxxxxxx>
>
> As part of addressing "y2038 problem" for in-kernel uses, this
> patch adds the y2038-safe omap_read_persistent_clock64() using
> timespec64.
>
> Because we rely on some subsequent changes to convert arm multiarch
> support, omap_read_persistent_clock() will be removed then.
>
> Also remove the needless spinlock, because read_persistent_clock()
> doesn't run simultaneously.
>
> Signed-off-by: Xunlei Pang <pang.xunlei@xxxxxxxxxx>
Looks OK to me:
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/plat-omap/counter_32k.c | 22 ++++++++++++----------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
> index 61b4d70..d422e36 100644
> --- a/arch/arm/plat-omap/counter_32k.c
> +++ b/arch/arm/plat-omap/counter_32k.c
> @@ -44,24 +44,20 @@ static u64 notrace omap_32k_read_sched_clock(void)
> }
>
> /**
> - * omap_read_persistent_clock - Return time from a persistent clock.
> + * omap_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.
> */
> -static struct timespec persistent_ts;
> +static struct timespec64 persistent_ts;
> static cycles_t cycles;
> static unsigned int persistent_mult, persistent_shift;
> -static DEFINE_SPINLOCK(read_persistent_clock_lock);
>
> -static void omap_read_persistent_clock(struct timespec *ts)
> +static void omap_read_persistent_clock64(struct timespec64 *ts)
> {
> unsigned long long nsecs;
> cycles_t last_cycles;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&read_persistent_clock_lock, flags);
>
> last_cycles = cycles;
> cycles = sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0;
> @@ -69,11 +65,17 @@ static void omap_read_persistent_clock(struct timespec *ts)
> nsecs = clocksource_cyc2ns(cycles - last_cycles,
> persistent_mult, persistent_shift);
>
> - timespec_add_ns(&persistent_ts, nsecs);
> + timespec64_add_ns(&persistent_ts, nsecs);
>
> *ts = persistent_ts;
> +}
> +
> +static void omap_read_persistent_clock(struct timespec *ts)
> +{
> + struct timespec64 ts64;
>
> - spin_unlock_irqrestore(&read_persistent_clock_lock, flags);
> + omap_read_persistent_clock64(&ts64);
> + *ts = timespec64_to_timespec(ts64);
> }
>
> /**
> --
> 1.9.1
>
>
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