[cel:nfsd-testing 214/240] fs/nfsd/vfs.c:286:52: sparse: sparse: incorrect type in initializer (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux nfsd-testing
head:   e2407463212ffde400eb33dbee5098af3f02f346
commit: f0212435e29b1624ee539b04611cd4658497a5be [214/240] nfsd: move check_nfsd_access() call into nfsd_cross_mnt()
config: i386-randconfig-r112-20260722 (https://download.01.org/0day-ci/archive/20260723/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260723/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
>> fs/nfsd/vfs.c:286:52: sparse: sparse: incorrect type in initializer (different base types) @@     expected int nfserr @@     got restricted __be32 @@
   fs/nfsd/vfs.c:286:52: sparse:     expected int nfserr
   fs/nfsd/vfs.c:286:52: sparse:     got restricted __be32
>> fs/nfsd/vfs.c:291:40: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __be32 @@     got int nfserr @@
   fs/nfsd/vfs.c:291:40: sparse:     expected restricted __be32
   fs/nfsd/vfs.c:291:40: sparse:     got int nfserr
   fs/nfsd/vfs.c:2435:27: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/nfsd/vfs.c:2435:27: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'
   fs/nfsd/vfs.c:2435:27: sparse: sparse: undefined identifier '__builtin_infer_alloc_token'

vim +286 fs/nfsd/vfs.c

   249	
   250	__be32
   251	nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
   252			   const char *name, unsigned int len,
   253			   struct svc_export **exp_ret, struct dentry **dentry_ret)
   254	{
   255		struct svc_export	*exp;
   256		struct dentry		*dparent;
   257		struct dentry		*dentry;
   258		int			host_err;
   259	
   260		trace_nfsd_vfs_lookup(rqstp, fhp, name, len);
   261	
   262		dparent = fhp->fh_dentry;
   263		exp = exp_get(fhp->fh_export);
   264	
   265		/* Lookup the name, but don't follow links */
   266		if (name_is_dot_dotdot(name, len)) {
   267			if (len==1)
   268				dentry = dget(dparent);
   269			else if (dparent != exp->ex_path.dentry)
   270				dentry = dget_parent(dparent);
   271			else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp))
   272				dentry = dget(dparent); /* .. == . just like at / */
   273			else {
   274				/* checking mountpoint crossing is very different when stepping up */
   275				host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry);
   276				if (host_err)
   277					goto out_nfserr;
   278			}
   279		} else {
   280			dentry = lookup_one_unlocked(&nop_mnt_idmap,
   281						     &QSTR_LEN(name, len), dparent);
   282			host_err = PTR_ERR(dentry);
   283			if (IS_ERR(dentry))
   284				goto out_nfserr;
   285			if (nfsd_mountpoint(dentry, exp)) {
 > 286				int nfserr = nfsd_cross_mnt(rqstp, &dentry, &exp);
   287	
   288				if (nfserr) {
   289					dput(dentry);
   290					exp_put(exp);
 > 291					return nfserr;
   292				}
   293			}
   294		}
   295		*dentry_ret = dentry;
   296		*exp_ret = exp;
   297		return 0;
   298	
   299	out_nfserr:
   300		exp_put(exp);
   301		return nfserrno(host_err);
   302	}
   303	

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