netdev - Re: [PATCH] net: Reorder initialization in ip_route

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Message-ID: <CAG4TOxNpw0BAWPK3Zde_mThTvY-ho+Ce_aau3DoLc-0TRFq3PQ@mail.gmail.com>
Date:	Mon, 11 Jun 2012 00:00:51 -0700
From:	Roland Dreier <roland@...nel.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: Reorder initialization in ip_route_output to fix gcc warning

> I can't figure out what it is actually warning about, can you?

I think gcc thinks it already initialized the __fl_common struct
once when it hits the .flowi4_oif initializer (which expands to
__fl_common.flowic_oif), and then having the .daddr / .saddr
initializers makes it thinks its done with that structure.

So it thinks it's initializing __fl_common.flowic_tos to 0, and
then the .flowi4_tos initializer comes along as a surprise.

Hmm, looks like http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52880
which is fixed after gcc 4.7.0.  I think it's probably worth working
around this gcc issue, since this makes W=1 way noisier in
my build.

 - R.
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