IS_ERR             34 include/linux/err.h static inline bool __must_check IS_ERR(__force const void *ptr)
IS_ERR             45 tools/include/linux/err.h static inline bool __must_check IS_ERR(__force const void *ptr)
IS_ERR             18 tools/virtio/linux/err.h static inline long __must_check IS_ERR(const void *ptr)