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[PATCH] remove active field from tty buffer structure

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Remove 'active' field from tty buffer structure.  This was added in 2.6.16
as part of a patch to make the new tty buffering SMP safe.  This field is
unnecessary with the more intelligently written flush_to_ldisc that adds
receive_room handling.

Removing this field reverts to simpler logic where the tail buffer is
always the 'active' buffer, which should not be freed by flush_to_ldisc.
(active == buffer being filled with new data)

The result is simpler, smaller, and faster tty buffer code.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Fulghum 2006-06-28 04:26:49 -07:00 • committed by Linus Torvalds
parent 2c3bb20f46
commit 33b37a33c2
4 changed files with 6 additions and 17 deletions
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4
include/linux/kbd_kern.h
View file

@ -155,10 +155,8 @@ static inline void con_schedule_flip(struct tty_struct *t)
{
unsigned long flags;
spin_lock_irqsave(&t->buf.lock, flags);
if (t->buf.tail != NULL) {
t->buf.tail->active = 0;
if (t->buf.tail != NULL)
t->buf.tail->commit = t->buf.tail->used;
}
spin_unlock_irqrestore(&t->buf.lock, flags);
schedule_work(&t->buf.work);
}