On Fri, Mar 20, 2015 at 09:36:44AM +0000, Build bot for Mark Brown wrote:
arm-allmodconfig ../fs/btrfs/inode.c:8050:2: error: implicit declaration of function 'iov_iter_alignment' [-Werror=implicit-function-declaration] ../fs/btrfs/inode.c:8061:26: error: dereferencing pointer to incomplete type ../fs/btrfs/inode.c:8062:29: error: dereferencing pointer to incomplete type ../fs/btrfs/inode.c:8063:12: error: dereferencing pointer to incomplete type ../fs/btrfs/inode.c:8063:39: error: dereferencing pointer to incomplete type ../fs/btrfs/inode.c:8095:2: error: implicit declaration of function 'iov_iter_count' [-Werror=implicit-function-declaration]
For a few days now btrfs has been breaking the ARM allmodconfig build due to the above errors. It is relying on the implicit inclusion of linux/uio.h which isn't getting pulled in on ARM (and possibly some other architectures too) for the definition of both struct iov_iter and iov_iter_alignment.