return unlikely((unsigned long)ptr > (unsigned long)-1000L); 
return IS_ERR_VALUE((unsigned long)ptr); 
static inline long IS_ERR(const void *ptr){	return unlikely((unsigned long)ptr > (unsigned long)-1000L);}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/07ab67c8d0d7c1021343b7d5c045033d6bf7be69/err.h/clean/include/linux/err.h