1 /*
2  * lib/bust_spinlocks.c
3  *
4  * Provides a minimal bust_spinlocks for architectures which don't have one of their own.
5  *
6  * bust_spinlocks() clears any spinlocks which would prevent oops, die(), BUG()
7  * and panic() information from reaching the user.
8  */
9 
10 #include <linux/config.h>
11 #include <linux/kernel.h>
12 #include <linux/spinlock.h>
13 #include <linux/tty.h>
14 #include <linux/wait.h>
15 #include <linux/vt_kern.h>
16 
17 extern spinlock_t timerlist_lock;
18 
bust_spinlocks(int yes)19 void bust_spinlocks(int yes)
20 {
21 	spin_lock_init(&timerlist_lock);
22 	if (yes) {
23 		oops_in_progress = 1;
24 	} else {
25 		int loglevel_save = console_loglevel;
26 #ifdef CONFIG_VT
27 		unblank_screen();
28 #endif
29 		oops_in_progress = 0;
30 		/*
31 		 * OK, the message is on the console.  Now we call printk()
32 		 * without oops_in_progress set so that printk() will give klogd
33 		 * and the blanked console a poke.  Hold onto your hats...
34 		 */
35 		console_loglevel = 15;		/* NMI oopser may have shut the console up */
36 		printk(" ");
37 		console_loglevel = loglevel_save;
38 	}
39 }
40 
41 
42