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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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 <[email protected]>

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 <[email protected]>

thanks
-john

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux