linux-kernel - Re: [PATCH 10/14] tty/serial: Add kgdb

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Message-ID: <20120910121105.724f982f@pyramind.ukuu.org.uk>
Date:	Mon, 10 Sep 2012 12:11:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Jason Wessel <jason.wessel@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Colin Cross <ccross@...roid.com>,
	Brian Swetland <swetland@...gle.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com, kgdb-bugreport@...ts.sourceforge.net,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 10/14] tty/serial: Add kgdb_nmi driver

On Sun, 9 Sep 2012 21:14:12 -0700
Anton Vorontsov <anton.vorontsov@...aro.org> wrote:

> This special driver makes it possible to temporary use NMI debugger port
> as a normal console by issuing 'nmi_console' command (assuming that the
> port is attached to KGDB).

No ref counting, no tty port, no compliance with the tty behaviour.
Concept looks fine but it needs porting to reflect a kernel newer than
about 2.6.18 8)

I would take a quick look at the tty_port helpers and also check v -next
which makes the tty_port mandatory. That'll pretty much cover your needs
for locking, semantics and the like.

Alan
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