linux-kernel - Re: [PATCH] watchdog: xen: use time64

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Date:   Thu, 19 Oct 2017 08:51:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Wim Van Sebroeck <wim@...ana.be>, y2038@...ts.linaro.org,
        xen-devel@...ts.xenproject.org, Jan Beulich <JBeulich@...e.com>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: xen: use time64_t for timeouts

On Thu, Oct 19, 2017 at 05:05:48PM +0200, Arnd Bergmann wrote:
> The Xen watchdog driver uses __kernel_time_t and ktime_to_timespec()
> internally for managing its timeouts. Both are deprecated because of
> y2038 problems. The driver itself is fine, since it only uses monotonic
> times, but converting it to use ktime_get_seconds() avoids the deprecated
> interfaces and is slightly simpler.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/xen_wdt.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/watchdog/xen_wdt.c b/drivers/watchdog/xen_wdt.c
> index cf0e650c2015..5dd5c3494d55 100644
> --- a/drivers/watchdog/xen_wdt.c
> +++ b/drivers/watchdog/xen_wdt.c
> @@ -35,7 +35,7 @@
>  static struct platform_device *platform_device;
>  static DEFINE_SPINLOCK(wdt_lock);
>  static struct sched_watchdog wdt;
> -static __kernel_time_t wdt_expires;
> +static time64_t wdt_expires;
>  static bool is_active, expect_release;
>  
>  #define WATCHDOG_TIMEOUT 60 /* in seconds */
> @@ -49,15 +49,15 @@ module_param(nowayout, bool, S_IRUGO);
>  MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
>  	"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
>  
> -static inline __kernel_time_t set_timeout(void)
> +static inline time64_t set_timeout(void)
>  {
>  	wdt.timeout = timeout;
> -	return ktime_to_timespec(ktime_get()).tv_sec + timeout;
> +	return ktime_get_seconds() + timeout;
>  }
>  
>  static int xen_wdt_start(void)
>  {
> -	__kernel_time_t expires;
> +	time64_t expires;
>  	int err;
>  
>  	spin_lock(&wdt_lock);
> @@ -98,7 +98,7 @@ static int xen_wdt_stop(void)
>  
>  static int xen_wdt_kick(void)
>  {
> -	__kernel_time_t expires;
> +	time64_t expires;
>  	int err;
>  
>  	spin_lock(&wdt_lock);
> @@ -222,7 +222,7 @@ static long xen_wdt_ioctl(struct file *file, unsigned int cmd,
>  		return put_user(timeout, argp);
>  
>  	case WDIOC_GETTIMELEFT:
> -		retval = wdt_expires - ktime_to_timespec(ktime_get()).tv_sec;
> +		retval = wdt_expires - ktime_get_seconds();
>  		return put_user(retval, argp);
>  	}
>  
> -- 
> 2.9.0
>