[ammarfaizi2-block:dhowells/linux-fs/netfs-linked-list 57/57] fs/netfs/buffered_write.c:934:2: warning: TRIGGER NEW FLUSH GROUP FOR TESTING

[ammarfaizi2-block:dhowells/linux-fs/netfs-linked-list 57/57] fs/netfs/buffered_write.c:934:2: warning: TRIGGER NEW FLUSH GROUP FOR TESTING

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-linked-list
head:   c19d336b7f0c53bd31e73f6d7d6c1524f0df55b8
commit: c19d336b7f0c53bd31e73f6d7d6c1524f0df55b8 [57/57] netfs: Add a struct to group modifications together and flushed in order
config: arm-randconfig-r034-20220610 (https://download.01.org/0day-ci/archive/20220611/202206111840.22bAafuo-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ff4abe755279a3a47cc416ef80dbc900d9a98a19)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/c19d336b7f0c53bd31e73f6d7d6c1524f0df55b8
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-linked-list
        git checkout c19d336b7f0c53bd31e73f6d7d6c1524f0df55b8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash fs/netfs/ lib/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/netfs/buffered_write.c:934:2: warning: TRIGGER NEW FLUSH GROUP FOR TESTING [-W#warnings]
   #warning TRIGGER NEW FLUSH GROUP FOR TESTING
    ^
   fs/netfs/buffered_write.c:22:20: warning: unused function 'netfs_pgoff_before_touch' [-Wunused-function]
   static inline bool netfs_pgoff_before_touch(pgoff_t a, pgoff_t b)
                      ^
   2 warnings generated.


vim +934 fs/netfs/buffered_write.c

   893	
   894	/**
   895	 * netfs_file_write_iter - write data to a file
   896	 * @iocb:	IO state structure
   897	 * @from:	iov_iter with data to write
   898	 *
   899	 * This is a wrapper around __generic_file_write_iter() to be used by most
   900	 * filesystems. It takes care of syncing the file in case of O_SYNC file and
   901	 * acquires i_mutex as needed.
   902	 * Return:
   903	 * * negative error code if no data has been written at all of
   904	 *   vfs_fsync_range() failed for a synchronous write
   905	 * * number of bytes written, even for truncated writes
   906	 */
   907	ssize_t netfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
   908	{
   909		struct file *file = iocb->ki_filp;
   910		struct inode *inode = file->f_mapping->host;
   911		struct netfs_inode *ctx = netfs_inode(inode);
   912		ssize_t ret;
   913	
   914		_enter("%llx,%zx,%llx", iocb->ki_pos, iov_iter_count(from), i_size_read(inode));
   915	
   916		inode_lock(inode);
   917		ret = generic_write_checks(iocb, from);
   918		if (ret <= 0)
   919			goto error_unlock;
   920	
   921		trace_netfs_write_iter(iocb, from);
   922	
   923		/* We can write back this queue in page reclaim */
   924		current->backing_dev_info = inode_to_bdi(inode);
   925		ret = file_remove_privs(file);
   926		if (ret)
   927			goto error;
   928	
   929		ret = file_update_time(file);
   930		if (ret)
   931			goto error;
   932	
   933		{
 > 934	#warning TRIGGER NEW FLUSH GROUP FOR TESTING
   935			static atomic_t jump;
   936			ret = netfs_require_flush_group(inode, (atomic_inc_return(&jump) & 3) == 3);
   937			if (ret < 0)
   938				goto error;
   939		}
   940	
   941		ret = netfs_flush_conflicting_writes(ctx, file, iocb->ki_pos,
   942						     iov_iter_count(from), NULL);
   943		if (ret < 0 && ret != -EAGAIN)
   944			goto error;
   945	
   946		if (iocb->ki_flags & IOCB_DIRECT)
   947			ret = netfs_direct_write_iter(iocb, from);
   948		else
   949			ret = netfs_perform_write(iocb, from);
   950	
   951	error:
   952		inode_unlock(inode);
   953		/* TODO: Wait for DSYNC region here. */
   954		current->backing_dev_info = NULL;
   955		return ret;
   956	error_unlock:
   957		inode_unlock(inode);
   958		return ret;
   959	}
   960	EXPORT_SYMBOL(netfs_file_write_iter);
   961	

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