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[PATCH] vt: rework the console spawning variables

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This is such a rare path it took me a while to figure out how to test
this after soring out the locking.

This patch does several things.
- The variables used are moved into a structure and declared in vt_kern.h
- A spinlock is added so we don't have SMP races updating the values.
- Instead of raw pid_t value a struct_pid is used to guard against
  pid wrap around issues, if the daemon to spawn a new console dies.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman
2006-10-02 02:17:13 -07:00
committed by Linus Torvalds
parent 5feb8f5f84
commit 81af8d67d4
3 changed files with 25 additions and 7 deletions
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7
include/linux/vt_kern.h
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@@ -84,4 +84,11 @@ void reset_vc(struct vc_data *vc);
extern char con_buf[CON_BUF_SIZE];
extern struct semaphore con_buf_sem;
struct vt_spawn_console {
spinlock_t lock;
struct pid *pid;
int sig;
};
extern struct vt_spawn_console vt_spawn_con;
#endif /* _VT_KERN_H */