[linux.git] / lib / bust_spinlocks.c

/*
 * lib/bust_spinlocks.c
 *
 * Provides a minimal bust_spinlocks for architectures which don't have one of their own.
 *
 * bust_spinlocks() clears any spinlocks which would prevent oops, die(), BUG()
 * and panic() information from reaching the user.
 */

#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/tty.h>
#include <linux/wait.h>
#include <linux/vt_kern.h>


void bust_spinlocks(int yes)
{
	if (yes) {
		oops_in_progress = 1;
	} else {
		int loglevel_save = console_loglevel;
#ifdef CONFIG_VT
		unblank_screen();
#endif
		oops_in_progress = 0;
		/*
		 * OK, the message is on the console.  Now we call printk()
		 * without oops_in_progress set so that printk() will give klogd
		 * and the blanked console a poke.  Hold onto your hats...
		 */
		console_loglevel = 15;		/* NMI oopser may have shut the console up */
		printk(" ");
		console_loglevel = loglevel_save;
	}
}
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	10	#include <linux/kernel.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/tty.h>
	13	#include <linux/wait.h>
	14	#include <linux/vt_kern.h>
	15
	16
	17	void bust_spinlocks(int yes)
	18	{
	19	if (yes) {
	20	oops_in_progress = 1;
	21	} else {
	22	int loglevel_save = console_loglevel;
	23	#ifdef CONFIG_VT
	24	unblank_screen();
	25	#endif
	26	oops_in_progress = 0;
	27	/*
	28	* OK, the message is on the console. Now we call printk()
	29	* without oops_in_progress set so that printk() will give klogd
	30	* and the blanked console a poke. Hold onto your hats...
	31	*/
	32	console_loglevel = 15; /* NMI oopser may have shut the console up */
	33	printk(" ");
	34	console_loglevel = loglevel_save;
	35	}
	36	}
	37
	38