Line data    Source code

       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           0 : void bust_spinlocks(int yes)
      21             : {
      22           0 :         if (yes) {
      23           0 :                 ++oops_in_progress;
      24             :         } else {
      25             : #ifdef CONFIG_VT
      26           0 :                 unblank_screen();
      27             : #endif
      28           0 :                 console_unblank();
      29           0 :                 if (--oops_in_progress == 0)
      30           0 :                         wake_up_klogd();
      31             :         }
      32           0 : }