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authorEric W. Biederman <ebiederm@xmission.com>2007-02-10 01:44:34 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:24 -0800
commit8b6312f4dcc1efe7975731b6c47dd134282bd9ac (patch)
tree71c94b01bda940c5610d448d0f4a2aa3c7665b4c /include
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')
-rw-r--r--include/linux/console_struct.h3
-rw-r--r--include/linux/tty.h1
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);