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authorEric W. Biederman <ebiederm@xmission.com>2007-02-10 04:44:34 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 13:51:24 -0500
commit8b6312f4dcc1efe7975731b6c47dd134282bd9ac (patch)
tree71c94b01bda940c5610d448d0f4a2aa3c7665b4c /include/linux/tty.h
parent0a7b35cb18c52d651f6ed9cd59edc979200ab880 (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.h1
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);
291extern void tty_unhangup(struct file *filp); 291extern void tty_unhangup(struct file *filp);
292extern int tty_hung_up_p(struct file * filp); 292extern int tty_hung_up_p(struct file * filp);
293extern void do_SAK(struct tty_struct *tty); 293extern void do_SAK(struct tty_struct *tty);
294extern void __do_SAK(struct tty_struct *tty);
294extern void disassociate_ctty(int priv); 295extern void disassociate_ctty(int priv);
295extern void tty_flip_buffer_push(struct tty_struct *tty); 296extern void tty_flip_buffer_push(struct tty_struct *tty);
296extern speed_t tty_get_baud_rate(struct tty_struct *tty); 297extern speed_t tty_get_baud_rate(struct tty_struct *tty);