Re: [PATCH v2 1/1] io_uring: allocate memory for overflowed CQEs

[Jens Axboe <axboe@xxxxxxxxx>]

On 2/23/21 5:40 AM, Pavel Begunkov wrote:
> +	if (!ctx->cq_overflow_flushed &&
> +	    !atomic_read(&req->task->io_uring->in_idle)) {
> +		struct io_overflow_cqe *ocqe = kmalloc(sizeof(*ocqe), GFP_KERNEL);

This needs to be GFP_ATOMIC. And we should probably make it GFP_ATOMIC |
__GFP_ACCOUNT to ensure it gets accounted, since the list could grow
pretty big potentially.

-- 
Jens Axboe