linux-kernel - fs/cramfs/inode.c:698: undefined reference to `mount

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Date:   Tue, 21 Nov 2017 23:46:45 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>
Subject: fs/cramfs/inode.c:698: undefined reference to `mount_mtd'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e1d1ea549b57790a3d8cf6300e6ef86118d692a3
commit: 99c18ce580c6cc6763e694b4ce320d7b226ab59b cramfs: direct memory access support
date:   5 weeks ago
config: i386-randconfig-i1-201747 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 99c18ce580c6cc6763e694b4ce320d7b226ab59b
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/cramfs/inode.o: In function `cramfs_mount':
>> fs/cramfs/inode.c:698: undefined reference to `mount_mtd'
   fs/cramfs/inode.o: In function `cramfs_mtd_fill_super':
>> fs/cramfs/inode.c:432: undefined reference to `mtd_point'
>> fs/cramfs/inode.c:449: undefined reference to `mtd_unpoint'
   fs/cramfs/inode.c:450: undefined reference to `mtd_point'

vim +698 fs/cramfs/inode.c

   691	
   692	static struct dentry *cramfs_mount(struct file_system_type *fs_type, int flags,
   693					   const char *dev_name, void *data)
   694	{
   695		struct dentry *ret = ERR_PTR(-ENOPROTOOPT);
   696	
   697		if (IS_ENABLED(CONFIG_CRAMFS_MTD)) {
 > 698			ret = mount_mtd(fs_type, flags, dev_name, data,
   699					cramfs_mtd_fill_super);
   700			if (!IS_ERR(ret))
   701				return ret;
   702		}
   703		if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV)) {
   704			ret = mount_bdev(fs_type, flags, dev_name, data,
   705					 cramfs_blkdev_fill_super);
   706		}
   707		return ret;
   708	}
   709	

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