[linux-next:master 10056/11507] security/apparmor/apparmorfs.c:1602:17: error: implicit declaration of function 'decompress_zstd'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   415606a7be939835db9b0d6b711887586646346d
commit: 1c5f27e845e84f58ed6bbe3e6bc12d6a013e74b5 [10056/11507] apparmor: Fix build failure when ZSTD_DECOMPRESS is not enabled
config: sparc-randconfig-002-20260801 (https://download.01.org/0day-ci/archive/20260801/202608010834.9yIVzhG2-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260801/202608010834.9yIVzhG2-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608010834.9yIVzhG2-lkp@intel.com/

All errors (new ones prefixed by >>):

   security/apparmor/apparmorfs.c: In function 'rawdata_open':
>> security/apparmor/apparmorfs.c:1602:17: error: implicit declaration of function 'decompress_zstd' [-Werror=implicit-function-declaration]
    1602 |         error = decompress_zstd(loaddata->data, loaddata->compressed_size,
         |                 ^~~~~~~~~~~~~~~
   At top level:
   security/apparmor/apparmorfs.c:1391:37: warning: 'seq_ns_compress_max_fops' defined but not used [-Wunused-const-variable=]
    1391 | static const struct file_operations seq_ns_ ##NAME ##_fops = {        \
         |                                     ^~~~~~~
   security/apparmor/apparmorfs.c:1470:1: note: in expansion of macro 'SEQ_NS_FOPS'
    1470 | SEQ_NS_FOPS(compress_max);
         | ^~~~~~~~~~~
   security/apparmor/apparmorfs.c:1391:37: warning: 'seq_ns_compress_min_fops' defined but not used [-Wunused-const-variable=]
    1391 | static const struct file_operations seq_ns_ ##NAME ##_fops = {        \
         |                                     ^~~~~~~
   security/apparmor/apparmorfs.c:1469:1: note: in expansion of macro 'SEQ_NS_FOPS'
    1469 | SEQ_NS_FOPS(compress_min);
         | ^~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/decompress_zstd +1602 security/apparmor/apparmorfs.c

5d5182cae40115 John Johansen 2017-05-09  1580  
5d5182cae40115 John Johansen 2017-05-09  1581  static int rawdata_open(struct inode *inode, struct file *file)
5d5182cae40115 John Johansen 2017-05-09  1582  {
63c16c3a760855 Chris Coulson 2019-01-23  1583  	int error;
63c16c3a760855 Chris Coulson 2019-01-23  1584  	struct aa_loaddata *loaddata;
63c16c3a760855 Chris Coulson 2019-01-23  1585  	struct rawdata_f_data *private;
63c16c3a760855 Chris Coulson 2019-01-23  1586  
92de220a7f3363 John Johansen 2020-06-30  1587  	if (!aa_current_policy_view_capable(NULL))
5ac8c355ae0013 John Johansen 2017-01-16  1588  		return -EACCES;
63c16c3a760855 Chris Coulson 2019-01-23  1589  
8e135b8aee5a06 John Johansen 2026-03-01  1590  	loaddata = get_loaddata_common_ref(inode->i_private);
63c16c3a760855 Chris Coulson 2019-01-23  1591  	if (!loaddata)
5d5182cae40115 John Johansen 2017-05-09  1592  		return -ENOENT;
5ac8c355ae0013 John Johansen 2017-01-16  1593  
63c16c3a760855 Chris Coulson 2019-01-23  1594  	private = rawdata_f_data_alloc(loaddata->size);
63c16c3a760855 Chris Coulson 2019-01-23  1595  	if (IS_ERR(private)) {
63c16c3a760855 Chris Coulson 2019-01-23  1596  		error = PTR_ERR(private);
63c16c3a760855 Chris Coulson 2019-01-23  1597  		goto fail_private_alloc;
63c16c3a760855 Chris Coulson 2019-01-23  1598  	}
63c16c3a760855 Chris Coulson 2019-01-23  1599  
63c16c3a760855 Chris Coulson 2019-01-23  1600  	private->loaddata = loaddata;
63c16c3a760855 Chris Coulson 2019-01-23  1601  
f4d6b94b40c966 Jon Tourville 2022-07-11 @1602  	error = decompress_zstd(loaddata->data, loaddata->compressed_size,
ad213bbbc0e3e2 John Johansen 2026-03-01  1603  				private->data, loaddata->size);
63c16c3a760855 Chris Coulson 2019-01-23  1604  	if (error)
63c16c3a760855 Chris Coulson 2019-01-23  1605  		goto fail_decompress;
63c16c3a760855 Chris Coulson 2019-01-23  1606  
63c16c3a760855 Chris Coulson 2019-01-23  1607  	file->private_data = private;
5ac8c355ae0013 John Johansen 2017-01-16  1608  	return 0;
63c16c3a760855 Chris Coulson 2019-01-23  1609  
63c16c3a760855 Chris Coulson 2019-01-23  1610  fail_decompress:
63c16c3a760855 Chris Coulson 2019-01-23  1611  	rawdata_f_data_free(private);
63c16c3a760855 Chris Coulson 2019-01-23  1612  	return error;
63c16c3a760855 Chris Coulson 2019-01-23  1613  
63c16c3a760855 Chris Coulson 2019-01-23  1614  fail_private_alloc:
a0b7091c4de45a John Johansen 2026-02-24  1615  	aa_put_i_loaddata(loaddata);
63c16c3a760855 Chris Coulson 2019-01-23  1616  	return error;
5ac8c355ae0013 John Johansen 2017-01-16  1617  }
5ac8c355ae0013 John Johansen 2017-01-16  1618  

:::::: The code at line 1602 was first introduced by commit
:::::: f4d6b94b40c966ddd9eeb0d451e8a02c595ec7e3 apparmor: use zstd compression for profile data

:::::: TO: Jon Tourville <jon.tourville@canonical.com>
:::::: CC: John Johansen <john.johansen@canonical.com>

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