On Tue, Sep 03, 2019 at 12:30:19PM +0900, Austin Kim wrote: > gcc throws warning message as below: What version of gcc reports that? 9.2.1 does not. > ‘clone_src_i_size’ may be used uninitialized in this function > [-Wmaybe-uninitialized] > #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) > ^ > fs/btrfs/send.c:5088:6: note: ‘clone_src_i_size’ was declared here > u64 clone_src_i_size; > ^ > The clone_src_i_size is only used as call-by-reference > in a call to get_inode_info(). The reference is passed to a static function, so the compiler has enough information to determine if it's unused. By inspection I don't see a problem with the uninitalized variable: if __get_inode_info succeeds, there's a valid value, in error case it's not used at all.
