tree:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git ioctl
head:   935e0ffbdaadacdfe519c891d36125f7e7d3d69a
commit: 57e59890e141c3cb14482736c0fbb26229c129a9 [3/5] NFS: Allow users to return the delegation
config: i386-randconfig-a3-201835 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 57e59890e141c3cb14482736c0fbb26229c129a9
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/nfs/ioctl.c: In function 'nfs_ioctl_return_delegation':
>> fs/nfs/ioctl.c:112:25: error: 'const struct nfs_rpc_ops' has no member named 'return_delegation'
     return NFS_PROTO(inode)->return_delegation(inode);
                            ^
   fs/nfs/ioctl.c:113:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +112 fs/nfs/ioctl.c

   107	
   108	static long nfs_ioctl_return_delegation(struct file *filp)
   109	{
   110		struct inode *inode = filp->f_path.dentry->d_inode;
   111	
 > 112		return NFS_PROTO(inode)->return_delegation(inode);
   113	}
   114	

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