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authorEric W. Biederman <ebiederm@xmission.com>2006-10-02 02:17:13 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-02 07:57:13 -0700
commit81af8d67d4fc35b1ee6e0feb1f1b34b3a33eeb44 (patch)
tree0217dde7d28427e9b6ac587fd4edb9fb1f8f11b4 /include/linux/vt_kern.h
parent5feb8f5f8403d8874a04aac443692dfe83bd63d2 (diff)
downloadop-kernel-dev-81af8d67d4fc35b1ee6e0feb1f1b34b3a33eeb44.zip
op-kernel-dev-81af8d67d4fc35b1ee6e0feb1f1b34b3a33eeb44.tar.gz
[PATCH] vt: rework the console spawning variables
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>
Diffstat (limited to 'include/linux/vt_kern.h')
-rw-r--r--include/linux/vt_kern.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 1009d3f..37a1a41 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -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 */
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