lib/bust_spinlocks.c

   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 have one of their own.
   6  *
   7  * bust_spinlocks() clears any spinlocks which would prevent oops, die(), BUG()
   8  * and panic() information from reaching the user.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/printk.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/tty.h>
  15 #include <linux/wait.h>
  16 #include <linux/vt_kern.h>
  17 #include <linux/console.h>
  18
  19
  20 void __attribute__((weak)) 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 }