[jarkko-tpmdd:sgx-cgroups-v9 3/21] kernel/cgroup/misc.c:446:25: warning: variable 'parent_cg' set but not used

[jarkko-tpmdd:sgx-cgroups-v9 3/21] kernel/cgroup/misc.c:446:25: warning: variable 'parent_cg' set but not used

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git sgx-cgroups-v9
head:   c9feec6d07a914300bfbb5eab86ad3222945f631
commit: e9af4921b9f22706e997afcc7a371a7bbeb69da6 [3/21] cgroup/misc: Add per resource callbacks for CSS events
config: openrisc-allmodconfig (https://download.01.org/0day-ci/archive/20240329/202403290053.FqcY10bG-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403290053.FqcY10bG-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/202403290053.FqcY10bG-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/cgroup/misc.c: In function 'misc_cg_alloc':
>> kernel/cgroup/misc.c:446:25: warning: variable 'parent_cg' set but not used [-Wunused-but-set-variable]
     446 |         struct misc_cg *parent_cg, *cg;
         |                         ^~~~~~~~~


vim +/parent_cg +446 kernel/cgroup/misc.c

   433	
   434	/**
   435	 * misc_cg_alloc() - Allocate misc cgroup.
   436	 * @parent_css: Parent cgroup.
   437	 *
   438	 * Context: Process context.
   439	 * Return:
   440	 * * struct cgroup_subsys_state* - css of the allocated cgroup.
   441	 * * ERR_PTR(-ENOMEM) - No memory available to allocate.
   442	 */
   443	static struct cgroup_subsys_state *
   444	misc_cg_alloc(struct cgroup_subsys_state *parent_css)
   445	{
 > 446		struct misc_cg *parent_cg, *cg;
   447		int ret;
   448	
   449		if (unlikely(!parent_css)) {
   450			parent_cg = cg = &root_cg;
   451		} else {
   452			cg = kzalloc(sizeof(*cg), GFP_KERNEL);
   453			if (!cg)
   454				return ERR_PTR(-ENOMEM);
   455			parent_cg = css_misc(parent_css);
   456		}
   457	
   458		ret = _misc_cg_res_alloc(cg);
   459		if (ret) {
   460			_misc_cg_res_free(cg);
   461			if (likely(parent_css))
   462				kfree(cg);
   463	
   464			return ERR_PTR(ret);
   465		}
   466	
   467		return &cg->css;
   468	}
   469	

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