linux-kernel - Re: [PATCH] io_uring/io-wq: Use set_bit() and test

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Message-ID: <75ae8634-72ad-4c6f-92af-76eaa1d3b1d9@wanadoo.fr>
Date: Fri, 3 May 2024 21:24:27 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Jens Axboe <axboe@...nel.dk>, Breno Leitao <leitao@...ian.org>,
 Pavel Begunkov <asml.silence@...il.com>
Cc: leit@...a.com, "open list:IO_URING" <io-uring@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] io_uring/io-wq: Use set_bit() and test_bit() at
 worker->flags

Le 03/05/2024 à 20:41, Jens Axboe a écrit :
> On 5/3/24 11:37 AM, Breno Leitao wrote:
>> @@ -631,7 +631,8 @@ static int io_wq_worker(void *data)
>>   	bool exit_mask = false, last_timeout = false;
>>   	char buf[TASK_COMM_LEN];
>>   
>> -	worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
>> +	set_bit(IO_WORKER_F_UP, &worker->flags);
>> +	set_bit(IO_WORKER_F_RUNNING, &worker->flags);
> 
> You could probably just use WRITE_ONCE() here with the mask, as it's
> setup side.
> 

Or simply:
    set_mask_bits(&worker->flags, 0, IO_WORKER_F_UP | IO_WORKER_F_RUNNING);

CJ