linux-kernel - Re: [RFC PATCH] poll(): add poll_wait_set

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Message-ID: <AANLkTik3MWtEpi=mzf2-_x4_kdrwv-EOjeVHNzbmfian@mail.gmail.com>
Date:	Wed, 6 Oct 2010 11:08:32 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@....de>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH] poll(): add poll_wait_set_exclusive()

On Wed, Oct 6, 2010 at 10:56 AM, Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
> Executive summary:
>
> Addition of the new internal API:

Executive summary: no.

You need to explain first how you could _ever_ use this without
breaking select/poll semantics totally.

IOW, you need to explain the user space interface first. Before you do
that, this patch is total and utter crap that is expressly designed to
used only in a manner that is a pure bug.

                       Linus
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