linux-kernel - Re: [PATCH 06/10] io_uring: add support for futex wake and wait

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Date:   Fri, 21 Jul 2023 08:43:48 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        andres@...razel.de
Subject: Re: [PATCH 06/10] io_uring: add support for futex wake and wait

On 7/21/23 5:37?AM, Peter Zijlstra wrote:
> On Fri, Jul 21, 2023 at 01:30:31PM +0200, Peter Zijlstra wrote:
> 
> Sorry, I was too quick..
> 
> 	iof->uaddr = sqe->addr;
> 	iof->val   = sqe->futex_val;
> 	iof->mask  = sqe->futex_mask;
> 	flags      = sqe->futex_flags;
> 
> 	if (flags & ~FUTEX2_MASK)
> 		return -EINVAL;
> 
> 	iof->flags = futex2_to_flags(flags);
> 	if (!futex_flags_valid(iof->flags))
> 		return -EINVAL;
> 
> 	if (!futex_validate_input(iof->flags, iof->val) ||
> 	    !futex_validate_input(iof->flags, iof->mask))
> 		return -EINVAL

Something like that should work, with some variable names fixed up. I
just went with 'addr' for the futex address, addr2 for the value, and
addr3 for the mask.

Rebased on top of your first 4 updated patches, and added a single patch
that moves FUTEX2_MASK, will run some testing to validate it's all still
sane.

-- 
Jens Axboe