linux-kernel - Re: [PATCH v3 0/2] AF_VSOCK: Shrink the area influenced by prepare_to

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Date:	Tue, 22 Mar 2016 16:19:16 -0400 (EDT)
From:	David Miller <davem@...hat.com>
To:	imbrenda@...ux.vnet.ibm.com
Cc:	labbott@...oraproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] AF_VSOCK: Shrink the area influenced by
 prepare_to_wait

From: Claudio Imbrenda <imbrenda@...ux.vnet.ibm.com>
Date: Tue, 22 Mar 2016 17:05:50 +0100

> This patchset applies on net-next.
> 
> I think I found a problem with the patch submitted by Laura Abbott
> ( https://lkml.org/lkml/2016/2/4/711 ): we might miss wakeups.
> Since the condition is not checked between the prepare_to_wait and the
> schedule(), if a wakeup happens after the condition is checked but before
> the sleep happens, and we miss it. ( A description of the problem can be
> found here: http://www.makelinux.net/ldd3/chp-6-sect-2 ).
> 
> The first patch reverts the previous broken patch, while the second patch
> properly fixes the sleep-while-waiting issue.

Series applied, thanks for following up on this.