[koverstreet-bcachefs:bcachefs-testing 259/259] arch/x86/include/asm/string_32.h:195:29: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters

[koverstreet-bcachefs:bcachefs-testing 259/259] arch/x86/include/asm/string_32.h:195:29: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters

[kernel test robot]

tree:   https://github.com/koverstreet/bcachefs bcachefs-testing
head:   931ffb231a45d53ede3ea0e28f28de35c7817a55
commit: 931ffb231a45d53ede3ea0e28f28de35c7817a55 [259/259] fs: dcache exlusion between overlayfs, casefolding
config: i386-buildonly-randconfig-003-20250522 (https://download.01.org/0day-ci/archive/20250522/202505220250.LTGElWSM-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250522/202505220250.LTGElWSM-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/202505220250.LTGElWSM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/string.h:3,
                    from arch/x86/include/asm/cpuid/api.h:10,
                    from arch/x86/include/asm/cpuid.h:6,
                    from arch/x86/include/asm/processor.h:19,
                    from include/linux/sched.h:13,
                    from include/linux/ratelimit.h:6,
                    from fs/dcache.c:18:
   fs/dcache.c: In function 'd_casefold_enable':
>> arch/x86/include/asm/string_32.h:195:29: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
     195 | #define memset(s, c, count) __builtin_memset(s, c, count)
         |                             ^~~~~~~~~~~~~~~~
   fs/dcache.c:3307:9: note: in expansion of macro 'memset'
    3307 |         memset(e, sizeof(*e), 0);
         |         ^~~~~~


vim +/memset +195 arch/x86/include/asm/string_32.h

^1da177e4c3f41 include/asm-i386/string.h        Linus Torvalds   2005-04-16  186  
^1da177e4c3f41 include/asm-i386/string.h        Linus Torvalds   2005-04-16  187  #define __memset(s, c, count)				\
78d64fc21d2aa4 include/asm-x86/string_32.h      Joe Perches      2008-05-12  188  	(__builtin_constant_p(count)			\
78d64fc21d2aa4 include/asm-x86/string_32.h      Joe Perches      2008-05-12  189  	 ? __constant_count_memset((s), (c), (count))	\
78d64fc21d2aa4 include/asm-x86/string_32.h      Joe Perches      2008-05-12  190  	 : __memset_generic((s), (c), (count)))
^1da177e4c3f41 include/asm-i386/string.h        Linus Torvalds   2005-04-16  191  
^1da177e4c3f41 include/asm-i386/string.h        Linus Torvalds   2005-04-16  192  #define __HAVE_ARCH_MEMSET
6974f0c4555e28 arch/x86/include/asm/string_32.h Daniel Micay     2017-07-12  193  extern void *memset(void *, int, size_t);
6974f0c4555e28 arch/x86/include/asm/string_32.h Daniel Micay     2017-07-12  194  #ifndef CONFIG_FORTIFY_SOURCE
ff60fab71bb3b4 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 @195  #define memset(s, c, count) __builtin_memset(s, c, count)
6974f0c4555e28 arch/x86/include/asm/string_32.h Daniel Micay     2017-07-12  196  #endif /* !CONFIG_FORTIFY_SOURCE */
^1da177e4c3f41 include/asm-i386/string.h        Linus Torvalds   2005-04-16  197  

:::::: The code at line 195 was first introduced by commit
:::::: ff60fab71bb3b4fdbf8caf57ff3739ffd0887396 x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy

:::::: TO: Arjan van de Ven <arjan@infradead.org>
:::::: CC: H. Peter Anvin <hpa@zytor.com>

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