linux-kernel - Re: [PATCH][for-linus] io_uring: Fix mm_fault with READ/WRITE

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Message-ID: <e70202d3-53c1-db48-f95b-0334f11178d1@kernel.dk>
Date:   Sun, 27 Oct 2019 21:28:36 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][for-linus] io_uring: Fix mm_fault with READ/WRITE_FIXED

On 10/27/19 2:15 PM, Pavel Begunkov wrote:
> Commit fb5ccc98782f ("io_uring: Fix broken links with offloading")
> itroduced a regression with unconditionally taking mm even for
> READ/WRITE_FIXED operations.
> 
> Return the logic handling it back. mm-faulted requests will go through
> the generic submission path, so honoring links and drains, but will
> fail further on req->has_user check.

I thought about this a bit, and I think we should just defer this to
the next release and mark it stable for 5.4. I'll do that, thanks.

-- 
Jens Axboe