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

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Message-ID: <20130521162958.GA1927@udknight>
Date:	Wed, 22 May 2013 00:29:58 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>,
	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 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. 
> 
> But the reverse is ok. So if we have to do it, then the actual interface 
> is do_take_over_console, and the "_workaround_" is exposing take_over_console 
> as a wrap base on do_take_over_console.

But if we do this, then we have two version functions do the same thing except
caller/callee hold lock, I can't see much sense to have them at the same time.

Thanks.
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