netdev - Re: Compiler warnings in kernel 4.14.51

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Message-ID: <2cdf9843-0014-dc89-bede-a4d38c9bf264@gmail.com>
Date:   Mon, 2 Jul 2018 09:18:47 -0600
From:   David Ahern <dsahern@...il.com>
To:     Enrico Mioso <mrkiko.rs@...il.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: Compiler warnings in kernel 4.14.51

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.