From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] tcp: shrink tcp6_timewait_sock by one cache
 line
Date: Thu, 03 Oct 2013 15:31:58 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 02 Oct 2013 04:00:04 -0700

> +	tmo = tw->tw_ttd - (u32)jiffies;
 ...
> +		tw->tw_ttd = (u32)(jiffies + timeo);
 ...
> +		tw->tw_ttd = (u32)(jiffies + (slot << INET_TWDR_RECYCLE_TICK));
 ...
> +	s32 delta = tw->tw_ttd - (u32)jiffies;
 ...
> +	s32 delta = tw->tw_ttd - (u32)jiffies;

Eric just use tcp_time_stamp in all of these locations, then you can
lose the casts and still achieve your stated objective.

Thanks.