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 | |
| 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')
| -rw-r--r-- | include/linux/console_struct.h | 3 | ||||
| -rw-r--r-- | include/linux/tty.h | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h index ed6c0fee1ac..a86162b26c0 100644 --- a/include/linux/console_struct.h +++ b/include/linux/console_struct.h @@ -11,6 +11,7 @@ #include <linux/wait.h> #include <linux/vt.h> +#include <linux/workqueue.h> struct vt_struct; @@ -103,6 +104,7 @@ struct vc_data { struct vc { struct vc_data *d; + struct work_struct SAK_work; /* might add scrmem, vt_struct, kbd at some time, to have everything in one place - the disadvantage @@ -110,6 +112,7 @@ struct vc { }; extern struct vc vc_cons [MAX_NR_CONSOLES]; +extern void vc_SAK(struct work_struct *work); #define CUR_DEF 0 #define CUR_NONE 1 diff --git a/include/linux/tty.h b/include/linux/tty.h index 65cbcf22c31..0161a8c6dbf 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); |