[ammarfaizi2-block:dhowells/linux-fs/netfs-maple 24/40] include/linux/fscache.h:540: undefined reference to `__fscache_begin_write_operation'

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-maple
head:   674eea41fc70a740ff83ec590f9833f805852464
commit: d77af6a0e73b5e3c4bae01c64df536f2662e2dab [24/40] netfs: Dispatch write requests to process a writeback slice
config: x86_64-rhel-8.3-func (https://download.01.org/0day-ci/archive/20220405/202204052321.Q7Js0HBV-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/d77af6a0e73b5e3c4bae01c64df536f2662e2dab
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-maple
        git checkout d77af6a0e73b5e3c4bae01c64df536f2662e2dab
        # save the config file 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@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: fs/netfs/output.o: in function `fscache_begin_write_operation':
>> include/linux/fscache.h:540: undefined reference to `__fscache_begin_write_operation'


vim +540 include/linux/fscache.h

9af1c6c3089b29 David Howells 2021-10-20  516  
16f2f4e679cfda David Howells 2021-08-27  517  /**
16f2f4e679cfda David Howells 2021-08-27  518   * fscache_begin_write_operation - Begin a write operation for the netfs lib
16f2f4e679cfda David Howells 2021-08-27  519   * @cres: The cache resources for the write being performed
16f2f4e679cfda David Howells 2021-08-27  520   * @cookie: The cookie representing the cache object
16f2f4e679cfda David Howells 2021-08-27  521   *
16f2f4e679cfda David Howells 2021-08-27  522   * Begin a write operation on behalf of the netfs helper library.  @cres
16f2f4e679cfda David Howells 2021-08-27  523   * indicates the cache resources to which the operation state should be
16f2f4e679cfda David Howells 2021-08-27  524   * attached; @cookie indicates the cache object that will be accessed.
16f2f4e679cfda David Howells 2021-08-27  525   *
16f2f4e679cfda David Howells 2021-08-27  526   * @cres->inval_counter is set from @cookie->inval_counter for comparison at
16f2f4e679cfda David Howells 2021-08-27  527   * the end of the operation.  This allows invalidation during the operation to
16f2f4e679cfda David Howells 2021-08-27  528   * be detected by the caller.
16f2f4e679cfda David Howells 2021-08-27  529   *
16f2f4e679cfda David Howells 2021-08-27  530   * Returns:
16f2f4e679cfda David Howells 2021-08-27  531   * * 0		- Success
16f2f4e679cfda David Howells 2021-08-27  532   * * -ENOBUFS	- No caching available
16f2f4e679cfda David Howells 2021-08-27  533   * * Other error code from the cache, such as -ENOMEM.
16f2f4e679cfda David Howells 2021-08-27  534   */
16f2f4e679cfda David Howells 2021-08-27  535  static inline
16f2f4e679cfda David Howells 2021-08-27  536  int fscache_begin_write_operation(struct netfs_cache_resources *cres,
16f2f4e679cfda David Howells 2021-08-27  537  				  struct fscache_cookie *cookie)
16f2f4e679cfda David Howells 2021-08-27  538  {
16f2f4e679cfda David Howells 2021-08-27  539  	if (fscache_cookie_enabled(cookie))
16f2f4e679cfda David Howells 2021-08-27 @540  		return __fscache_begin_write_operation(cres, cookie);
16f2f4e679cfda David Howells 2021-08-27  541  	return -ENOBUFS;
16f2f4e679cfda David Howells 2021-08-27  542  }
16f2f4e679cfda David Howells 2021-08-27  543  

:::::: The code at line 540 was first introduced by commit
:::::: 16f2f4e679cfdaa9552574484f104014908a76c6 nfs: Implement cache I/O by accessing the cache directly

:::::: TO: David Howells <dhowells@xxxxxxxxxx>
:::::: CC: David Howells <dhowells@xxxxxxxxxx>

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