linux-kernel - Re: [PATCH] iio: Convert to use timespec64 variables to get a time stamp

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Date:   Mon, 4 Jun 2018 11:17:54 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Mark Brown <broonie@...nel.org>, linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] iio: Convert to use timespec64 variables to get a time stamp

On Mon, Jun 4, 2018 at 11:07 AM, Baolin Wang <baolin.wang@...aro.org> wrote:
> The struct timespec is not y2038 safe on 32bit machines, thus this patch
> converts to use timespec64 variables and related APIs to get a time stamp
> for events etc.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>

Hi Baolin,

I was waiting with this for the new header file cleanup to land. Thomas
merged that one recently, so now we should be able to do this more nicely:


diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 19bdf3d2962a..fcbe92c34a3d 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -207,35 +207,27 @@ static int iio_device_set_clock(struct iio_dev
*indio_dev, clockid_t clock_id)
  */
 s64 iio_get_time_ns(const struct iio_dev *indio_dev)
 {
-       struct timespec tp;
+       struct timespec64 tp;

        switch (iio_device_get_clock(indio_dev)) {
        case CLOCK_REALTIME:
-               ktime_get_real_ts(&tp);
-               break;
+               return ktime_get_real_ns();
        case CLOCK_MONOTONIC:
-               ktime_get_ts(&tp);
-               break;
+               return ktime_get_ns();
        case CLOCK_MONOTONIC_RAW:
-               getrawmonotonic(&tp);
-               break;
+               return ktime_get_raw_ns();
        case CLOCK_REALTIME_COARSE:
-               tp = current_kernel_time();
-               break;
+               return ktime_to_ns(ktime_get_coarse_real());
        case CLOCK_MONOTONIC_COARSE:
-               tp = get_monotonic_coarse();
-               break;
+               ktime_get_coarse_ts64(&tp);
+               return timespec64_to_ns(&tp);
        case CLOCK_BOOTTIME:
-               get_monotonic_boottime(&tp);
-               break;
+               return ktime_get_boot_ns();
        case CLOCK_TAI:
-               timekeeping_clocktai(&tp);
-               break;
+               return ktime_get_tai_ns();
        default:
                BUG();
        }
-
-       return timespec_to_ns(&tp);
 }
 EXPORT_SYMBOL(iio_get_time_ns);