#define __user __attribute__((address_space(1)))

typedef unsigned long ulong;
typedef struct s obj_t;

static void expl(ulong u, void *v, obj_t *o, obj_t __user *p)
{
        (obj_t*)(u);
        (obj_t __user*)(u);

        (obj_t*)(v);
        (obj_t __user*)(v);

        (ulong)(o);
        (void *)(o);
        (obj_t*)(o);
        (obj_t __user*)(o);

        (ulong)(p);             // w!
        (void *)(p);            // w
        (obj_t*)(p);            // w
        (obj_t __user*)(p);     // ok
}

/*
 * check-name: Waddress-space-strict
 * check-command: sparse -Wcast-from-as -Wcast-to-as $file
 *
 * check-error-start
Waddress-space-strict.c:12:10: warning: cast adds address space '<asn:1>' to expression
Waddress-space-strict.c:17:10: warning: cast adds address space '<asn:1>' to expression
Waddress-space-strict.c:19:10: warning: cast removes address space '<asn:1>' of expression
Waddress-space-strict.c:20:10: warning: cast removes address space '<asn:1>' of expression
Waddress-space-strict.c:21:10: warning: cast removes address space '<asn:1>' of expression
 * check-error-end
 */