Date: Fri, 23 Jan 2004 16:18:07 +1300
From: Nigel Cunningham <ncunningham@users.sourceforge.net>
Subject: Re: PATCH: Export console functions for use	by	Software	Suspend	nice
 display
In-reply-to: <1074827229.12773.198.camel@laptop-linux>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Daniel Jacobowitz <dan@debian.org>, viro@parcelfarce.linux.theplanet.co.uk,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Reply-to: ncunningham@users.sourceforge.net
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Sorry to reply to myself.

I don't think I worded that last message right... I didn't mean that
locking isn't an issue at all, just that we don't have to worry about
another process writing to the console while we are.

Nigel

On Sat, 2004-01-24 at 05:07, Nigel Cunningham wrote:
> Hi.
>=20
> On Fri, 2004-01-23 at 15:49, Benjamin Herrenschmidt wrote:
> > Also, by using write instead of blasting the low level code,
> > you will not have to worry about locking issues. (The way
> > you tap the low level stuff should require at least the console
> > semaphore held, write to /dev/console don't)
> >=20
> > Ben
>=20
> Locking is not an issue. This is suspend-to-disk. Everything else is
> stopped while we're working.
>=20
> By the way, am I understanding the suggestion correctly? Do you
> (collective) mean getting a fd for /dev/console from within kernel code
> and using that? I've been looking at the way printk works and wondering
> if con->write is equivalent (once I find the right console to write to)?
>=20
> Regards,
>=20
> Nigel
--=20
My work on Software Suspend is graciously brought to you by
LinuxFund.org.

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