linux-kernel - Re: [PATCH] xsk: Properly terminate assignment in xskq_produce_flush

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Date:   Wed, 26 Jun 2019 16:30:34 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        xdp-newbies@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Huckleberry <nhuck@...gle.com>
Subject: Re: [PATCH] xsk: Properly terminate assignment in
 xskq_produce_flush_desc

On 06/25/2019 08:23 PM, Nathan Chancellor wrote:
> Clang warns:
> 
> In file included from net/xdp/xsk_queue.c:10:
> net/xdp/xsk_queue.h:292:2: warning: expression result unused
> [-Wunused-value]
>         WRITE_ONCE(q->ring->producer, q->prod_tail);
>         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> include/linux/compiler.h:284:6: note: expanded from macro 'WRITE_ONCE'
>         __u.__val;                                      \
>         ~~~ ^~~~~
> 1 warning generated.
> 
> The q->prod_tail assignment has a comma at the end, not a semi-colon.
> Fix that so clang no longer warns and everything works as expected.
> 
> Fixes: c497176cb2e4 ("xsk: add Rx receive functions and poll support")
> Link: https://github.com/ClangBuiltLinux/linux/issues/544
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Applied, thanks!