linux-kernel - Re: [PATCH 1/1] eventfd: implementation of EFD

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Date:	Fri, 08 Feb 2013 06:26:43 +0100
From:	Martin Sustrik <sustrik@...bpm.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sha Zhengju <handai.szj@...bao.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] eventfd: implementation of EFD_MASK flag

Hi Andy,

On 08/02/13 02:03, Andy Lutomirski wrote:
> There may be some
> advantage to adding (later on, if needed) an option to change the
> flags set in:
>
> +		if (waitqueue_active(&ctx->wqh))
> +			wake_up_locked_poll(&ctx->wqh,
> +				(unsigned long)ctx->mask.events);
>
> (i.e. to allow the second parameter to omit some bits that were
> already signaled.)  Allowing write to write a bigger struct in the
> future won't break anything.

I think I don't follow. Either the second parameter is supposed to be 
*newly* signaled events, in which case the events that were already 
signaled in the past should be ommitted, or it is meant to be *all* 
signaled events, in which case the current implementation is OK.

Martin
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