validation/sm_implied4.c

   1 void _spin_lock(int name);
   2 void _spin_unlock(int name);
   3
   4 void frob(void){}
   5 int a;
   6 int b;
   7 int c;
   8 int func (void)
   9 {
  10         int mylock = 1;
  11         int mylock2 = 2;
  12
  13         if (a == 3)
  14                 _spin_lock(mylock);
  15         if (b)
  16                 frob();
  17         if (a == 3)
  18                 _spin_unlock(mylock);
  19         if (a)
  20                 _spin_lock(mylock);
  21         if (c)
  22                 return 0;
  23         if (!!a)
  24                 _spin_unlock(mylock);
  25         return 0;
  26 }
  27
  28 /*
  29  * check-name: Smatch implied #4
  30  * check-command: smatch --project=kernel sm_implied4.c
  31  *
  32  * check-output-start
  33 sm_implied4.c +22 func(14) warn: 'spin_lock:mylock' is sometimes locked here and sometimes unlocked.
  34  * check-output-end
  35  */