From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: Compiler warnings in kernel 4.14.51
Date: Mon, 2 Jul 2018 09:18:47 -0600
Message-ID: <2cdf9843-0014-dc89-bede-a4d38c9bf264@gmail.com>
References: <20180701203507.GA15211@mStation.localdomain>
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Cc: "David S. Miller" <davem@davemloft.net>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Kirill Tkhai <ktkhai@virtuozzo.com>,
        Jakub Kicinski <jakub.kicinski@netronome.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        John Fastabend <john.fastabend@gmail.com>,
        Jesper Dangaard Brouer <brouer@redhat.com>
To: Enrico Mioso <mrkiko.rs@gmail.com>, netdev@vger.kernel.org
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On 7/1/18 2:35 PM, Enrico Mioso wrote:
> Hello!
> 
> While compiling kernel 4.14.51 I got the following warnings:
> CC      net/core/dev.o
> net/core/dev.c: In function 'validate_xmit_skb_list':
> net/core/dev.c:3121:15: warning: 'tail' may be used uninitialized in this function [-Wmaybe-uninitialized]
> ...
> 
> CC      net/ipv4/fib_trie.o
> net/ipv4/fib_trie.c: In function 'fib_trie_unmerge':
> net/ipv4/fib_trie.c:1749:8: warning: 'local_tp' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> The kernel has been compiled for the MIPS architecture, little-endian 32-bit.

Not seen with x86-64, Debian stretch. In both cases the compiler should
be able to see they are set before use.