Re: [PATCH] io_uring/io-wq: Use set_bit() and test_bit() at worker->flags

[Jens Axboe]

On 5/7/24 5:02 AM, Breno Leitao wrote:
> On Tue, May 07, 2024 at 03:44:54AM -0700, Breno Leitao wrote:
>> Since we are now using WRITE_ONCE() in io_wq_worker, I am wondering if
>> this is what we want to do?
>>
>> 	WRITE_ONCE(worker->flags, (IO_WORKER_F_UP| IO_WORKER_F_RUNNING) << 1);
> 
> In fact, we can't clear flags here, so, more correct approach will be:
> 
> 	WRITE_ONCE(worker->flags, READ_ONCE(worker->flags) | (IO_WORKER_F_UP | IO_WORKER_F_RUNNING) << 1);
> 
> Does it sound reasonable?

Either that, or since we aren't just assigning the startup bits, maybe
just use set_mask_bits() like Christophe suggested and not worry about
it?

-- 
Jens Axboe