Re: [PATCH net-next] time: jiffies_delta_to_clock_t() helper tothe rescue

[David Miller]

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Thu, 09 Aug 2012 09:13:53 +0200

> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> 
> Various /proc/net files sometimes report crazy timer values, expressed
> in clock_t units.
> 
> This happens when an expired timer delta (expires - jiffies) is passed
> to jiffies_to_clock_t().
> 
> This function has an overflow in :
> 
> return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
> 
> commit cbbc719fccdb8cb (time: Change jiffies_to_clock_t() argument type
> to unsigned long) only got around the problem.
> 
> As we cant output negative values in /proc/net/tcp without breaking
> various tools, I suggest adding a jiffies_delta_to_clock_t() wrapper
> that caps the negative delta to a 0 value.
> 
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Reported-by: Maciej Żenczykowski <maze@xxxxxxxxxx>

Applied, thanks Eric.
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