From: Stephen Hemminger <shemminger@vyatta.com>
To: David Miller <davem@davemloft.net>
Cc: paolo.valente@unimore.it, jhs@mojatatu.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
rizzo@iet.unipi.it, fchecconi@gmail.com
Subject: Re: [PATCH] pkt_sched: QFQ Plus: fair-queueing service at DRR cost
Date: Tue, 20 Nov 2012 10:09:58 -0800 [thread overview]
Message-ID: <20121120100958.010e7605@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <20121120.130202.1918742054229219388.davem@davemloft.net>
On Tue, 20 Nov 2012 13:02:02 -0500 (EST)
David Miller <davem@davemloft.net> wrote:
> From: Stephen Hemminger <shemminger@vyatta.com>
> Date: Tue, 20 Nov 2012 09:53:04 -0800
>
> > There are actually lots of bogus warnings than seem to only occur
> > because gcc 4.4 does a bad job of checking. Later versions are fixed
> > and don't generate warnings.
> >
> > My preference is to not add the unnecessary initialization because
> > if you get in the habit of doing it. The whole purpose of the uninitialized
> > check is lost.
>
> Try again, this was with gcc-4.7.2-2 on Fedora.
>
> There are too many preconditions, across multiple basic block, which
> together ensure the skb is in fact initialized at the point in
> question and the compiler simply isn't sophisticated enough to see
> that.
Weird, it compiles clean on x86-84 on Debian.
gcc-4.7.real (Debian 4.7.2-4) 4.7.2
next prev parent reply other threads:[~2012-11-20 18:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 16:48 [PATCH] pkt_sched: QFQ Plus: fair-queueing service at DRR cost Paolo Valente
2012-11-19 23:48 ` David Miller
2012-11-19 23:48 ` David Miller
2012-11-20 17:45 ` Paolo Valente
2012-11-20 17:53 ` Stephen Hemminger
2012-11-20 18:02 ` David Miller
2012-11-20 18:09 ` Stephen Hemminger [this message]
2012-11-20 18:15 ` David Miller
2012-11-20 18:44 ` Stephen Hemminger
2012-11-20 18:00 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2012-11-20 17:45 Paolo Valente
2012-11-20 18:54 ` David Miller
2012-11-21 9:45 ` Paolo Valente
2012-11-21 17:04 ` David Miller
2012-11-22 16:56 Paolo Valente
2012-11-23 19:28 ` David Miller
2012-11-23 21:02 ` Paolo Valente
2012-11-23 21:03 Paolo Valente
2012-11-28 16:20 ` David Miller
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