linux-kernel - Re: [PATCH v3 2/3] aio: make aio

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Message-ID: <x49oakclws8.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 18 Jun 2015 14:02:47 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin LaHaise <bcrl@...ck.org>, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] aio: make aio_ring->dead boolean

Oleg Nesterov <oleg@...hat.com> writes:

> "atomic_t dead" makes no sense. atomic_read() is the plain LOAD,
> it doesn't have some "additional" synchronization with xchg().
>
> And now that kill_ioctx() sets "dead" under mm->ioctx_lock we do
> not even need xchg().
>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> Reviewed-by: Jeff Moyer <jmoyer@...hat.com>

> @@ -765,7 +765,7 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
>  err_cleanup:
>  	aio_nr_sub(ctx->max_reqs);
>  err_ctx:
> -	atomic_set(&ctx->dead, 1);
> +	ctx->dead = true; /* unneeded */

I was hoping you'd remove this line entirely.

-Jeff
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