linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

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Date:	Thu, 13 May 2010 11:25:57 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Brian Swetland <swetland@...gle.com>
Cc:	Matthew Garrett <mjg@...hat.com>, Paul Walmsley <paul@...an.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Alan Stern <stern@...land.harvard.edu>, magnus.damm@...il.com,
	Theodore Ts'o <tytso@....edu>,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Benoît Cousson <b-cousson@...com>,
	linux-omap@...r.kernel.org, Vitaly Wool <vitalywool@...il.com>,
	Linus Walleij <linus.walleij@...csson.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

On Thu, 2010-05-13 at 11:17 -0700, Brian Swetland wrote:

> 
> I'm not sure this necessitates using only debugfs for the userspace
> interface.  A userspace interface is necessary to accomplish what
> we're trying to do here, otherwise we have only half a solution, and
> our hope is that it'd be a stable interface (as userspace interfaces
> are supposed to be) for as long as its needed.  I could totally
> imagine the userspace interface eventually becoming a no-op or
> punching through to some other facility, depending on how this problem
> is solved long-term in the ideal post-suspend-block future.

The problem is that once this userspace interface is exposed, it's
nearly permanent and has to be support for a long long time .. It might
seen trivial to just remove something your not using, but we never know
who is using what once the kernel is released.

Daniel

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