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Message-ID: <253f2fcd-f62d-90e1-2963-c8e5cdda4726@iogearbox.net>
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!
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