lib/bust_spinlocks.c

   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 #include <linux/console.h>
  16
  17
  18 void __attribute__((weak)) bust_spinlocks(int yes)
  19 {
  20         if (yes) {
  21                 ++oops_in_progress;
  22         } else {
  23 #ifdef CONFIG_VT
  24                 unblank_screen();
  25 #endif
  26                 console_unblank();
  27                 if (--oops_in_progress == 0)
  28                         wake_up_klogd();
  29         }
  30 }
  31
  32