Re: [RFC][PATCH -mm 1/2] i386: Detect clock skew during suspend

[john stultz <johnstul@us.ibm.com>]

On Sun, 2006-08-13 at 23:06 +0200, Rafael J. Wysocki wrote:
> Detect the situations in which the time after a resume from disk would
> be earlier than the time before the suspend and prevent them from
> happening on i386.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

One minor comment, but otherwise looks good.
 
> @@ -302,16 +305,25 @@ static int timer_resume(struct sys_devic
>  {
>  	unsigned long flags;
>  	unsigned long sec;
> -	unsigned long sleep_length;
> +	unsigned long ctime = get_cmos_time();
> +	long sleep_length = (ctime - sleep_start) * HZ;
>  	struct timespec ts;
> +
> +	if (sleep_length < 0) {
> +		printk(KERN_WARNING "Time skew detected in timer resume!\n");

Please make sure the warning describes the CMOS clock going backwards,
rather then just the vague "time skew detected" comment.

> +		/* The time after the resume must not be earlier than the time

s/time/CMOS clock/



Acked-by: John Stultz <johnstul@us.ibm.com>

thanks
-john