[dhowells-fs:fscache-iter 26/33] fs/afs/file.c:493:7: error: implicit declaration of function 'try_cmpxchg'; did you mean 'xa_cmpxchg'?

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-iter
head:   f62d2e3b55357b54ea4a541e85200ecdccfce7b4
commit: 3a3a05f119f1a5ff8fef8d8dcdd41c5f60e96467 [26/33] afs: Use new fscache I/O API
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3a3a05f119f1a5ff8fef8d8dcdd41c5f60e96467
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   fs/afs/file.c: In function 'afs_open_cache':
>> fs/afs/file.c:493:7: error: implicit declaration of function 'try_cmpxchg'; did you mean 'xa_cmpxchg'? [-Werror=implicit-function-declaration]
     if (!try_cmpxchg(&af->cache_io, &old, handle)) {
          ^~~~~~~~~~~
          xa_cmpxchg
   cc1: some warnings being treated as errors

vim +493 fs/afs/file.c

   474	
   475	/*
   476	 * Open the cache I/O handle.
   477	 */
   478	static struct fscache_io_handle *afs_open_cache(struct file *file,
   479							struct afs_vnode *vnode)
   480	{
   481		struct fscache_io_handle *handle, *old;
   482		struct afs_file *af = file->private_data;
   483	
   484		handle = af->cache_io;
   485		if (handle)
   486			return handle;
   487	
   488		handle = fscache_open_io_handle(vnode->cache);
   489		if (!handle)
   490			return handle;
   491	
   492		old = NULL;
 > 493		if (!try_cmpxchg(&af->cache_io, &old, handle)) {
   494			ASSERTCMP(old, ==, handle);
   495			fscache_put_io_handle(handle);
   496		}
   497	
   498		return handle;
   499	}
   500	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org Intel Corporation

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