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/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 39