linux-kernel - Re: [PATCH 1/3] power, vfs: move away from PF_KTHREAD freezing in favor of fs freezing

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Message-ID: <1446281756.21651.7.camel@suse.com>
Date:	Sat, 31 Oct 2015 09:55:56 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Christoph Hellwig <hch@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>, Tejun Heo <tj@...nel.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/3] power, vfs: move away from PF_KTHREAD freezing in
 favor of fs freezing

On Fri, 2015-10-30 at 14:47 +0100, Jiri Kosina wrote:
> Basically the main argument why kthread freezer is not needed boils
> down to
> this: the only facility that is needed during suspend: "no persistent
> fs
> changes are allowed from now on".

Is that true? Drivers of character devices also may assume
that IO and suspend() wouldn't race (except in fairly clear exceptions)

	Regards
		Oliver


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