[PATCH] watchdog: xen: use time64_t for timeouts

[PATCH] watchdog: xen: use time64_t for timeouts

[Arnd Bergmann]

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@arndb.de>
---
 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

Re: [PATCH] watchdog: xen: use time64_t for timeouts

[Guenter Roeck]

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@arndb.de>

Reviewed-by: Guenter Roeck <linux@roeck-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
>