[koverstreet-bcachefs:bcachefs-testing 259/260] arch/m68k/include/asm/string.h:49:25: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters

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

tree:   https://github.com/koverstreet/bcachefs bcachefs-testing
head:   6a62e6f0f866f2175751cdec81ae87ab573c8185
commit: e9d60153964008eaaa01f3bf287438dcff4c0d07 [259/260] fs: dcache exlusion between overlayfs, casefolding
config: m68k-allnoconfig (https://download.01.org/0day-ci/archive/20250522/202505221059.VB4PoKbz-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250522/202505221059.VB4PoKbz-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/202505221059.VB4PoKbz-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/string.h:65,
                    from include/linux/bitmap.h:13,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/sched.h:2213,
                    from include/linux/ratelimit.h:6,
                    from fs/dcache.c:18:
   fs/dcache.c: In function 'd_casefold_enable':
>> arch/m68k/include/asm/string.h:49:25: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
      49 | #define memset(d, c, n) __builtin_memset(d, c, n)
         |                         ^~~~~~~~~~~~~~~~
   fs/dcache.c:3307:9: note: in expansion of macro 'memset'
    3307 |         memset(e, sizeof(*e), 0);
         |         ^~~~~~
   fs/dcache.c: In function 'vfs_caches_init':
   fs/dcache.c:3454:65: warning: '%s' directive argument is null [-Wformat-overflow=]
    3454 |                 panic("error initializing no_casefold_dentries: %s\n", errname(ret));
         |                                                                 ^~


vim +/memset +49 arch/m68k/include/asm/string.h

ea61bc461d09e8 Greg Ungerer 2010-09-07  46  
ea61bc461d09e8 Greg Ungerer 2010-09-07  47  #define __HAVE_ARCH_MEMSET
ea61bc461d09e8 Greg Ungerer 2010-09-07  48  extern void *memset(void *, int, __kernel_size_t);
ea61bc461d09e8 Greg Ungerer 2010-09-07 @49  #define memset(d, c, n) __builtin_memset(d, c, n)
ea61bc461d09e8 Greg Ungerer 2010-09-07  50  

:::::: The code at line 49 was first introduced by commit
:::::: ea61bc461d09e8d331a307916530aaae808c72a2 m68k/m68knommu: merge MMU and non-MMU string.h

:::::: TO: Greg Ungerer <gerg@snapgear.com>
:::::: CC: Geert Uytterhoeven <geert@linux-m68k.org>

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