Hi Konstantin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   cd9fd78f5c11b5e165d9317ef11e613f4aef4dd1
commit: a3a956c78efaa202b1d75190136671cf6e87bfbe [10975/12895] fs/ntfs3: Add option "nocase"
config: i386-randconfig-a004-20221010
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a3a956c78efaa202b1d75190136671cf6e87bfbe
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout a3a956c78efaa202b1d75190136671cf6e87bfbe
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/ntfs3/

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

All warnings (new ones prefixed by >>):

>> fs/ntfs3/namei.c:445:7: warning: variable 'uni1' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
                   if (toupper(c1) != toupper(c2)) {
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/ctype.h:64:20: note: expanded from macro 'toupper'
   #define toupper(c) __toupper(c)
                      ^
   fs/ntfs3/namei.c:487:12: note: uninitialized use occurs here
           __putname(uni1);
                     ^~~~
   include/linux/fs.h:2789:65: note: expanded from macro '__putname'
   #define __putname(name)         kmem_cache_free(names_cachep, (void *)(name))
                                                                          ^~~~
   fs/ntfs3/namei.c:445:3: note: remove the 'if' if its condition is always false
                   if (toupper(c1) != toupper(c2)) {
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/ntfs3/namei.c:434:7: warning: variable 'uni1' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
                   if (!lm--) {
                       ^~~~~
   fs/ntfs3/namei.c:487:12: note: uninitialized use occurs here
           __putname(uni1);
                     ^~~~
   include/linux/fs.h:2789:65: note: expanded from macro '__putname'
   #define __putname(name)         kmem_cache_free(names_cachep, (void *)(name))
                                                                          ^~~~
   fs/ntfs3/namei.c:434:3: note: remove the 'if' if its condition is always false
                   if (!lm--) {
                   ^~~~~~~~~~~~
   fs/ntfs3/namei.c:430:22: note: initialize the variable 'uni1' to silence this warning
           struct cpu_str *uni1, *uni2;
                               ^
                                = NULL
   2 warnings generated.


vim +445 fs/ntfs3/namei.c

   416	
   417	/*
   418	 * dentry_operations::d_compare
   419	 */
   420	static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
   421				  const char *str, const struct qstr *name)
   422	{
   423		struct ntfs_sb_info *sbi;
   424		int ret;
   425		const char *n1 = str;
   426		const char *n2 = name->name;
   427		unsigned int len2 = name->len;
   428		unsigned int lm = min(len1, len2);
   429		unsigned char c1, c2;
   430		struct cpu_str *uni1, *uni2;
   431	
   432		/* First try fast implementation. */
   433		for (;;) {
   434			if (!lm--) {
   435				ret = len1 == len2 ? 0 : 1;
   436				goto out;
   437			}
   438	
   439			if ((c1 = *n1++) == (c2 = *n2++))
   440				continue;
   441	
   442			if (c1 >= 0x80 || c2 >= 0x80)
   443				break;
   444	
 > 445			if (toupper(c1) != toupper(c2)) {
   446				ret = 1;
   447				goto out;
   448			}
   449		}
   450	
   451		/*
   452		 * Try slow way with current upcase table
   453		 */
   454		sbi = dentry->d_sb->s_fs_info;
   455		uni1 = __getname();
   456		if (!uni1)
   457			return -ENOMEM;
   458	
   459		ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
   460					UTF16_HOST_ENDIAN);
   461		if (ret < 0)
   462			goto out;
   463	
   464		if (!ret) {
   465			ret = -EINVAL;
   466			goto out;
   467		}
   468	
   469		uni2 = Add2Ptr(uni1, 2048);
   470	
   471		ret = ntfs_nls_to_utf16(sbi, name->name, name->len, uni2, NTFS_NAME_LEN,
   472					UTF16_HOST_ENDIAN);
   473		if (ret < 0)
   474			goto out;
   475	
   476		if (!ret) {
   477			ret = -EINVAL;
   478			goto out;
   479		}
   480	
   481		ret = !ntfs_cmp_names(uni1->name, uni1->len, uni2->name, uni2->len,
   482				      sbi->upcase, false)
   483			      ? 0
   484			      : 1;
   485	
   486	out:
   487		__putname(uni1);
   488		return ret;
   489	}
   490	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp