linux-kernel - Re: [PATCH] io_uring: fix a GCC warning in wq_list_for

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Date:   Wed, 27 Oct 2021 11:11:56 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>
CC:     <io-uring@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] io_uring: fix a GCC warning in wq_list_for_each()



On 10/27/21 5:56 AM, Pavel Begunkov wrote:
> On 10/25/21 15:59, Qian Cai wrote:
>> fs/io_uring.c: In function '__io_submit_flush_completions':
>> fs/io_uring.c:2367:33: warning: variable 'prev' set but not used
>> [-Wunused-but-set-variable]
>>   2367 |  struct io_wq_work_node *node, *prev;
>>        |                                 ^~~~
>>
>> Fixed it by open-coded the wq_list_for_each() without an unused previous
>> node pointer.
> 
> That's intentional, the var is optimised out and it's better to
> not hand code it (if possible).

Yes, this is pretty minor. Not going to insist if people don't like for
some reasons.