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
  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