root/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/config.h>
#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;
        }
}