Subject: Re: tty_flip_buffer
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: linux-kernel@vger.kernel.org, mansarov@us.ibm.com
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Date: Fri, 18 Nov 2005 01:08:42 +0000
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On Maw, 2005-11-15 at 15:38 -0600, V. Ananda Krishnan wrote:
> tty_insert_flip_string_flags() API?  When I looked into the 
> implementation of the tty_insert_flip_string_flags API in tty_io.c, I 
> was little confused.

The flags buffer is used to hold the state of each character. Its
usually TTY_NORMAL and is set to TTY_NORMAL by the functions not taking
a flag value. It serves the same task as the flag buffer in the old
tty_flip.

> Also, can any one explain me the function of the free queue head in the 
> struct tty_bufhead?

Private to the tty layer pointer to allow small buffers as used with
byte at a time uarts to be recycled not freed/allocated

Alan

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