PTR_ERR            29 include/linux/err.h static inline long __must_check PTR_ERR(__force const void *ptr)
PTR_ERR            40 tools/include/linux/err.h static inline long __must_check PTR_ERR(__force const void *ptr)
PTR_ERR            13 tools/virtio/linux/err.h static inline long __must_check PTR_ERR(const void *ptr)