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[PATCH] vt: refactor console SAK processing

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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>
This commit is contained in:
Eric W. Biederman 2007-02-10 01:44:34 -08:00 • committed by Linus Torvalds
parent 0a7b35cb18
commit 8b6312f4dc
6 changed files with 45 additions and 18 deletions
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3
include/linux/console_struct.h
View file

@ -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