linux-kernel - Re: [PATCH] TTY:vt: convert remain take_over_console's users to do_take_over

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Message-ID: <519BB29D.9010104@hurleysoftware.com>
Date:	Tue, 21 May 2013 13:45:01 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Wang YanQing <udknight@...il.com>
CC:	gregkh@...uxfoundation.org, sfr@...b.auug.org.au,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] TTY:vt: convert remain take_over_console's users to do_take_over_console

On 05/21/2013 12:29 PM, Wang YanQing wrote:
> On Wed, May 22, 2013 at 12:18:49AM +0800, Wang YanQing wrote:
>>> Except now you're spreading the brokenness that is console_lock()
>>> over many more source files than the single-use case of
>>> do_take_over_console().
>>
>>> The actual interface is take_over_console(); the _workaround_ is
>>> exposing do_take_over_console() for fbcon to wrap.
>>
>> This _workaround_ willn't work, take_over_console will hold console_lock internal,
>> but do_take_over_console need caller hold console_lock, then we can't rewrite
>> do_take_over_console as a wrap base on take_over_console.

The workaround I'm referring to is commit 50e244cc793 which
exposed do_take_over_console() as an interface to band aid the lock
problems.

I'm ok with take_over_console() being a lock wrapper around
do_take_over_console(), if you are trying to preserve your
other changes.

Regards,
Peter Hurley



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