linux-kernel - RE: [PATCH] net/sched/sch

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Date:	Mon, 16 Dec 2013 13:34:57 +0000
From:	Qais Yousef <Qais.Yousef@...tec.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
CC:	Eric Dumazet <edumazet@...gle.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>
Subject: RE: [PATCH] net/sched/sch_tbf.c: fix linking error

Sorry for the noise. I'm not sure how this got sent out again. I definitely didn't type any git send-email commands at all today :-/

Qais

> -----Original Message-----
> From: Qais Yousef [mailto:qais.yousef@...tec.com]
> Sent: 12 December 2013 12:29
> To: Yang Yingliang
> Cc: Qais Yousef; Eric Dumazet; Jamal Hadi Salim; David S. Miller;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> next@...r.kernel.org
> Subject: [PATCH] net/sched/sch_tbf.c: fix linking error
> 
> ERROR: "__udivdi3" [net/sched/sch_tbf.ko] undefined!
> 
> introduced by: cc106e441a63 (net: sched: tbf: fix the calculation of max_size)
> 
> which adds a 64 by 32 bit division without using do_div().
> Fix it by using do_div(len/ 53) instead of len/53.
> 
> Signed-off-by: Qais Yousef <qais.yousef@...tec.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-next@...r.kernel.org
> ---
> We caught this error on linux-next today. This is my quick attemp of a fix.
> If it's not appropriate or doesn't make sense my apologies and feel free to resend
> a better fix :)
> 
>  net/sched/sch_tbf.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c index a44928c..771cbec
> 100644
> --- a/net/sched/sch_tbf.c
> +++ b/net/sched/sch_tbf.c
> @@ -131,8 +131,10 @@ static u64 psched_ns_t2l(const struct psched_ratecfg *r,
> 
>  	do_div(len, NSEC_PER_SEC);
> 
> -	if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
> -		len = (len / 53) * 48;
> +	if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) {
> +		do_div(len, 53);
> +		len *= 48;
> +	}
> 
>  	if (len > r->overhead)
>  		len -= r->overhead;
> --
> 1.7.1


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