linux-ext4 - Re: [PATCH 1/2] Add a new helper for sleepable BTM acquirements which is used by tty_write

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Date:	Sat, 30 Jun 2012 13:35:49 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	jeff.liu@...cle.com
Cc:	linux-serial@...r.kernel.org,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	gregkh@...uxfoundation.org, Jan Kara <jack@...e.cz>,
	"Ted Ts'o" <tytso@....edu>
Subject: Re: [PATCH 1/2] Add a new helper for sleepable BTM acquirements
 which is used by tty_write_message()

On Sat, 30 Jun 2012 17:39:58 +0800
Jeff Liu <jeff.liu@...cle.com> wrote:

> This helper only used by tty_write_message(), it will sleep until BTM lock acquired.

This makes no sense at all. mutexes already sleep. Your code is also
wrong for real time processes.

So NAK.
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