linux-kernel - [dhowells-fs:fscache-iter-2 66/67] include/linux/fscache.h:632: undefined reference to `__fscache_fallback_read

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Date:   Fri, 17 Sep 2021 23:09:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [dhowells-fs:fscache-iter-2 66/67] include/linux/fscache.h:632:
 undefined reference to `__fscache_fallback_read_page'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter-2
head:   23676c28d1a9add6ea09f19ca89b71be994a4b79
commit: be401b99396d9299b6e66ff061f722c275441d60 [66/67] nfs: Convert to new fscache volume/cookie API
config: x86_64-rhel-8.3-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=be401b99396d9299b6e66ff061f722c275441d60
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs fscache-iter-2
        git checkout be401b99396d9299b6e66ff061f722c275441d60
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   ld: fs/nfs/inode.o: in function `fscache_invalidate':
   include/linux/fscache.h:445: undefined reference to `__fscache_invalidate'
   ld: include/linux/fscache.h:445: undefined reference to `__fscache_invalidate'
   ld: fs/nfs/direct.o: in function `fscache_invalidate':
   include/linux/fscache.h:445: undefined reference to `__fscache_invalidate'
   ld: fs/nfs/write.o: in function `fscache_invalidate':
   include/linux/fscache.h:445: undefined reference to `__fscache_invalidate'
   ld: fs/nfs/fscache.o: in function `fscache_unuse_cookie':
   include/linux/fscache.h:287: undefined reference to `__fscache_unuse_cookie'
   ld: fs/nfs/fscache.o: in function `fscache_use_cookie':
   include/linux/fscache.h:270: undefined reference to `__fscache_use_cookie'
   ld: fs/nfs/fscache.o: in function `fscache_acquire_volume':
   include/linux/fscache.h:203: undefined reference to `__fscache_acquire_volume'
   ld: fs/nfs/fscache.o: in function `fscache_relinquish_volume':
   include/linux/fscache.h:222: undefined reference to `__fscache_relinquish_volume'
   ld: fs/nfs/fscache.o: in function `fscache_acquire_cookie':
   include/linux/fscache.h:251: undefined reference to `__fscache_acquire_cookie'
   ld: fs/nfs/fscache.o: in function `fscache_relinquish_cookie':
   include/linux/fscache.h:306: undefined reference to `__fscache_relinquish_cookie'
   ld: fs/nfs/fscache.o: in function `fscache_unuse_cookie':
   include/linux/fscache.h:287: undefined reference to `__fscache_unuse_cookie'
   ld: fs/nfs/fscache.o: in function `fscache_fallback_read_page':
>> include/linux/fscache.h:632: undefined reference to `__fscache_fallback_read_page'
   ld: fs/nfs/fscache.o: in function `fscache_fallback_write_page':
>> include/linux/fscache.h:652: undefined reference to `__fscache_fallback_write_page'
>> pahole: .tmp_vmlinux.btf: No such file or directory
   .btf.vmlinux.bin.o: file not recognized: file format not recognized


vim +632 include/linux/fscache.h

b5cd0254309847 David Howells 2021-09-14  615  
b5cd0254309847 David Howells 2021-09-14  616  /**
b5cd0254309847 David Howells 2021-09-14  617   * fscache_fallback_read_page - Read a page from a cache object (DANGEROUS)
b5cd0254309847 David Howells 2021-09-14  618   * @cookie: The cookie representing the cache object
b5cd0254309847 David Howells 2021-09-14  619   * @page: The page to be read to
b5cd0254309847 David Howells 2021-09-14  620   *
b5cd0254309847 David Howells 2021-09-14  621   * Synchronously read a page from the cache.  The page's offset is used to
b5cd0254309847 David Howells 2021-09-14  622   * indicate where to read.
b5cd0254309847 David Howells 2021-09-14  623   *
b5cd0254309847 David Howells 2021-09-14  624   * This is dangerous and should be moved away from as it relies on the
b5cd0254309847 David Howells 2021-09-14  625   * assumption that the backing filesystem will exactly record the blocks we
b5cd0254309847 David Howells 2021-09-14  626   * have stored there.
b5cd0254309847 David Howells 2021-09-14  627   */
b5cd0254309847 David Howells 2021-09-14  628  static inline
b5cd0254309847 David Howells 2021-09-14  629  int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
b5cd0254309847 David Howells 2021-09-14  630  {
e26619dc7e61b1 Jeff Layton   2020-07-30  631  	if (fscache_cookie_enabled(cookie))
b5cd0254309847 David Howells 2021-09-14 @632  		return __fscache_fallback_read_page(cookie, page);
b5cd0254309847 David Howells 2021-09-14  633  	return -ENOBUFS;
b5cd0254309847 David Howells 2021-09-14  634  }
b5cd0254309847 David Howells 2021-09-14  635  
b5cd0254309847 David Howells 2021-09-14  636  /**
b5cd0254309847 David Howells 2021-09-14  637   * fscache_fallback_write_page - Write a page to a cache object (DANGEROUS)
b5cd0254309847 David Howells 2021-09-14  638   * @cookie: The cookie representing the cache object
b5cd0254309847 David Howells 2021-09-14  639   * @page: The page to be written from
b5cd0254309847 David Howells 2021-09-14  640   *
b5cd0254309847 David Howells 2021-09-14  641   * Synchronously write a page to the cache.  The page's offset is used to
b5cd0254309847 David Howells 2021-09-14  642   * indicate where to write.
b5cd0254309847 David Howells 2021-09-14  643   *
b5cd0254309847 David Howells 2021-09-14  644   * This is dangerous and should be moved away from as it relies on the
b5cd0254309847 David Howells 2021-09-14  645   * assumption that the backing filesystem will exactly record the blocks we
b5cd0254309847 David Howells 2021-09-14  646   * have stored there.
b5cd0254309847 David Howells 2021-09-14  647   */
b5cd0254309847 David Howells 2021-09-14  648  static inline
b5cd0254309847 David Howells 2021-09-14  649  int fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
b5cd0254309847 David Howells 2021-09-14  650  {
e26619dc7e61b1 Jeff Layton   2020-07-30  651  	if (fscache_cookie_enabled(cookie))
b5cd0254309847 David Howells 2021-09-14 @652  		return __fscache_fallback_write_page(cookie, page);
b5cd0254309847 David Howells 2021-09-14  653  	return -ENOBUFS;
b5cd0254309847 David Howells 2021-09-14  654  }
b5cd0254309847 David Howells 2021-09-14  655  

:::::: The code at line 632 was first introduced by commit
:::::: b5cd0254309847abfb2eebfbcbd4415d61c5af1b fscache: Implement a fallback I/O interface to replace the old API

:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>

---
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