linux-kernel - Re: [PATCH] pkt_sched: QFQ Plus: fair-queueing service at DRR cost

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Message-ID: <50ABC19E.9030209@unimore.it>
Date:	Tue, 20 Nov 2012 18:45:02 +0100
From:	Paolo Valente <paolo.valente@...more.it>
To:	David Miller <davem@...emloft.net>
CC:	jhs@...atatu.com, shemminger@...tta.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	rizzo@....unipi.it, fchecconi@...il.com
Subject: Re: [PATCH] pkt_sched: QFQ Plus: fair-queueing service at DRR cost

Il 20/11/2012 00:48, David Miller ha scritto:
> From: Paolo Valente <paolo.valente@...more.it>
> Date: Mon, 12 Nov 2012 17:48:33 +0100
>
>> [This patch received positive feedback from Stephen Hemminger ("put in
>> net-next"), but no further feedback or decision. So I am (re)sending
>> an updated version of it. The only differences with respect to the
>> previous version are the support for TSO/GSO (taken from QFQ), and a
>> hopefully improved description.]
>
> Can you rearrange the logic so that the compiler doesn't emit this
> warning?
>
> In file included from net/sched/sch_qfq.c:18:0:
> net/sched/sch_qfq.c: In function ‘qfq_dequeue’:
> include/net/sch_generic.h:480:15: warning: ‘skb’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> net/sched/sch_qfq.c:1007:18: note: ‘skb’ was declared here
>
> You and I both know that SKB will be initialized at this point, but
> the compiler can't see it clearly enough.
>
Unfortunately I could not reproduce the warning (with
gcc-4.7 -Wmaybe-uninitialized). I am however about to send a new version 
with skb initialized to NULL. I hope that this fix properly addresses 
this issue.
> Thanks.
>


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