diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2007-02-10 01:44:34 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-11 10:51:24 -0800 |
commit | 8b6312f4dcc1efe7975731b6c47dd134282bd9ac (patch) | |
tree | 71c94b01bda940c5610d448d0f4a2aa3c7665b4c /include/linux/tty.h | |
parent | 0a7b35cb18c52d651f6ed9cd59edc979200ab880 (diff) |
[PATCH] vt: refactor console SAK processing
This does several things.
- It moves looking up of the current foreground console into process
context where we can safely take the semaphore that protects this
operation.
- It uses the new flavor of work queue processing.
- This generates a factor of do_SAK, __do_SAK that runs immediately.
- This calls __do_SAK with the console semaphore held ensuring nothing
else happens to the console while we process the SAK operation.
- With the console SAK processing moved into process context this
patch removes the xchg operations that I used to attempt to attomically
update struct pid, because of the strange locking used in the SAK processing.
With SAK using the normal console semaphore nothing special is needed.
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/tty.h')
-rw-r--r-- | include/linux/tty.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index 65cbcf22c31e..0161a8c6dbf6 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -291,6 +291,7 @@ extern void tty_vhangup(struct tty_struct * tty); extern void tty_unhangup(struct file *filp); extern int tty_hung_up_p(struct file * filp); extern void do_SAK(struct tty_struct *tty); +extern void __do_SAK(struct tty_struct *tty); extern void disassociate_ctty(int priv); extern void tty_flip_buffer_push(struct tty_struct *tty); extern speed_t tty_get_baud_rate(struct tty_struct *tty); |