From 33b37a33c242542fac2980b8ccd90977388b7a8d Mon Sep 17 00:00:00 2001 From: Paul Fulghum Date: Wed, 28 Jun 2006 04:26:49 -0700 Subject: [PATCH] remove active field from tty buffer structure 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 Cc: Alan Cox Cc: Theodore Ts'o Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/kbd_kern.h | 4 +--- include/linux/tty.h | 1 - include/linux/tty_flip.h | 2 +- 3 files changed, 2 insertions(+), 5 deletions(-) (limited to 'include') diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h index 4eb851ece080..efe0ee4cc80b 100644 --- a/include/linux/kbd_kern.h +++ b/include/linux/kbd_kern.h @@ -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); } diff --git a/include/linux/tty.h b/include/linux/tty.h index 341cc4552c00..b3b807e4b050 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -57,7 +57,6 @@ struct tty_buffer { unsigned char *flag_buf_ptr; int used; int size; - int active; int commit; int read; /* Data points here */ diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h index 31548303ee37..eb677cf56106 100644 --- a/include/linux/tty_flip.h +++ b/include/linux/tty_flip.h @@ -12,7 +12,7 @@ static inline int tty_insert_flip_char(struct tty_struct *tty, unsigned char ch, char flag) { struct tty_buffer *tb = tty->buf.tail; - if (tb && tb->active && tb->used < tb->size) { + if (tb && tb->used < tb->size) { tb->flag_buf_ptr[tb->used] = flag; tb->char_buf_ptr[tb->used++] = ch; return 1; -- cgit v1.2.2