Hi,

[auto build test ERROR on v4.6-rc4]
[also build test ERROR on next-20160420]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Dirk-Gouders/kconfig-symbol-c-handle-choice_values-that-depend-on-m-symbols/20160420-182514
config: x86_64-randconfig-s0-04201943 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> fs/romfs/storage.c:18:2: error: #error no ROMFS backing store interface configured
    #error no ROMFS backing store interface configured
     ^

vim +18 fs/romfs/storage.c

da4458bd David Howells    2009-02-12   2   *
da4458bd David Howells    2009-02-12   3   * Copyright © 2007 Red Hat, Inc. All Rights Reserved.
da4458bd David Howells    2009-02-12   4   * Written by David Howells (dhowells@redhat.com)
da4458bd David Howells    2009-02-12   5   *
da4458bd David Howells    2009-02-12   6   * This program is free software; you can redistribute it and/or
da4458bd David Howells    2009-02-12   7   * modify it under the terms of the GNU General Public License
da4458bd David Howells    2009-02-12   8   * as published by the Free Software Foundation; either version
da4458bd David Howells    2009-02-12   9   * 2 of the License, or (at your option) any later version.
da4458bd David Howells    2009-02-12  10   */
da4458bd David Howells    2009-02-12  11  
da4458bd David Howells    2009-02-12  12  #include <linux/fs.h>
da4458bd David Howells    2009-02-12  13  #include <linux/mtd/super.h>
da4458bd David Howells    2009-02-12  14  #include <linux/buffer_head.h>
da4458bd David Howells    2009-02-12  15  #include "internal.h"
da4458bd David Howells    2009-02-12  16  
da4458bd David Howells    2009-02-12  17  #if !defined(CONFIG_ROMFS_ON_MTD) && !defined(CONFIG_ROMFS_ON_BLOCK)
da4458bd David Howells    2009-02-12 @18  #error no ROMFS backing store interface configured
da4458bd David Howells    2009-02-12  19  #endif
da4458bd David Howells    2009-02-12  20  
da4458bd David Howells    2009-02-12  21  #ifdef CONFIG_ROMFS_ON_MTD
c382fb43 Artem Bityutskiy 2012-01-30  22  #define ROMFS_MTD_READ(sb, ...) mtd_read((sb)->s_mtd, ##__VA_ARGS__)
da4458bd David Howells    2009-02-12  23  
da4458bd David Howells    2009-02-12  24  /*
da4458bd David Howells    2009-02-12  25   * read data from an romfs image on an MTD device
da4458bd David Howells    2009-02-12  26   */

:::::: The code at line 18 was first introduced by commit
:::::: da4458bda237aa0cb1688f6c359477f203788f6a NOMMU: Make it possible for RomFS to use MTD devices directly

:::::: TO: David Howells <dhowells@redhat.com>
:::::: CC: David Woodhouse <David.Woodhouse@intel.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation