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

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Date:	Mon, 19 Nov 2012 18:48:28 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	paolo.valente@...more.it
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

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.

Thanks.