1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * lib/bust_spinlocks.c 4 * 5 * Provides a minimal bust_spinlocks for architectures which don't 6 * have one of their own. 7 * 8 * bust_spinlocks() clears any spinlocks which would prevent oops, die(), BUG() 9 * and panic() information from reaching the user. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/printk.h> 14 #include <linux/spinlock.h> 15 #include <linux/tty.h> 16 #include <linux/wait.h> 17 #include <linux/vt_kern.h> 18 #include <linux/console.h> 19 20 void bust_spinlocks(int yes) 21 { 22 if (yes) { 23 ++oops_in_progress; 24 } else { 25 #ifdef CONFIG_VT 26 unblank_screen(); 27 #endif 28 console_unblank(); 29 if (--oops_in_progress == 0) 30 wake_up_klogd(); 31 } 32 } 33