1 #define __user __attribute__((address_space(1)))
   2 
   3 typedef unsigned long ulong;
   4 typedef struct s obj_t;
   5 
   6 static void expl(ulong u, void *v, obj_t *o, obj_t __user *p)
   7 {
   8         (obj_t*)(u);
   9         (obj_t __user*)(u);
  10 
  11         (obj_t*)(v);
  12         (obj_t __user*)(v);
  13 
  14         (ulong)(o);
  15         (void *)(o);
  16         (obj_t*)(o);
  17         (obj_t __user*)(o);
  18 
  19         (ulong)(p);             // w!
  20         (void *)(p);            // w
  21         (obj_t*)(p);            // w
  22         (obj_t __user*)(p);     // ok
  23 }
  24 
  25 /*
  26  * check-name: Waddress-space-strict
  27  * check-command: sparse -Wcast-from-as -Wcast-to-as $file
  28  *
  29  * check-error-start
  30 Waddress-space-strict.c:12:10: warning: cast adds address space '<asn:1>' to expression
  31 Waddress-space-strict.c:17:10: warning: cast adds address space '<asn:1>' to expression
  32 Waddress-space-strict.c:19:10: warning: cast removes address space '<asn:1>' of expression
  33 Waddress-space-strict.c:20:10: warning: cast removes address space '<asn:1>' of expression
  34 Waddress-space-strict.c:21:10: warning: cast removes address space '<asn:1>' of expression
  35  * check-error-end
  36  */