[paulmckrcu:cmpxchg2.2026.09.22a 25/28] arch/arc/include/asm/cmpxchg.h:46:58: error: pointer type mismatch in conditional expression

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

tree:   https://github.com/paulmckrcu/linux cmpxchg2.2026.09.22a
head:   54c282c15475ebfae4712fe3ab637c9d19c723d6
commit: b6d4f6af38f85e7948fd64f9bf09cbb858b4dade [25/28] ARC: Emulate two-byte cmpxchg
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20260924/202609241517.SSV1Goz3-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260924/202609241517.SSV1Goz3-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/202609241517.SSV1Goz3-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/arc/include/asm/atomic.h:13,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/lock.h:5,
                    from arch/arc/include/asm/bitops.h:190,
                    from include/linux/bitops.h:67,
                    from include/linux/log2.h:12,
                    from include/asm-generic/div64.h:55,
                    from ./arch/arc/include/generated/asm/div64.h:1,
                    from include/linux/math.h:6,
                    from include/linux/math64.h:6,
                    from include/linux/time.h:6,
                    from include/linux/stat.h:19,
                    from include/linux/fs_dirent.h:5,
                    from include/linux/fs/super_types.h:5,
                    from include/linux/fs/super.h:5,
                    from include/linux/fs.h:5,
                    from include/linux/fscrypt.h:16,
                    from fs/crypto/fscrypt_private.h:15,
                    from fs/crypto/hooks.c:10:
   fs/crypto/hooks.c: In function 'fscrypt_get_symlink':
>> arch/arc/include/asm/cmpxchg.h:46:58: error: pointer type mismatch in conditional expression [-Wincompatible-pointer-types]
      46 |         unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new));              \
         |                                                          ^
   include/linux/atomic.h:68:9: note: in expansion of macro 'arch_cmpxchg_relaxed'
      68 |         op##_relaxed(args);                                             \
         |         ^~
   include/linux/atomic/atomic-arch-fallback.h:80:9: note: in expansion of macro '__atomic_op_release'
      80 |         __atomic_op_release(arch_cmpxchg, __VA_ARGS__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:4803:9: note: in expansion of macro 'raw_cmpxchg_release'
    4803 |         raw_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
         |         ^~~~~~~~~~~~~~~~~~~
   fs/crypto/hooks.c:420:13: note: in expansion of macro 'cmpxchg_release'
     420 |             cmpxchg_release(&inode->i_link, NULL, pstr.name) != NULL)
         |             ^~~~~~~~~~~~~~~
   arch/arc/include/asm/cmpxchg.h:46:51: note: first expression has type 'char *'
      46 |         unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new));              \
         |                                                   ^~~~~~
   include/linux/atomic.h:68:9: note: in expansion of macro 'arch_cmpxchg_relaxed'
      68 |         op##_relaxed(args);                                             \
         |         ^~
   include/linux/atomic/atomic-arch-fallback.h:80:9: note: in expansion of macro '__atomic_op_release'
      80 |         __atomic_op_release(arch_cmpxchg, __VA_ARGS__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:4803:9: note: in expansion of macro 'raw_cmpxchg_release'
    4803 |         raw_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
         |         ^~~~~~~~~~~~~~~~~~~
   fs/crypto/hooks.c:420:13: note: in expansion of macro 'cmpxchg_release'
     420 |             cmpxchg_release(&inode->i_link, NULL, pstr.name) != NULL)
         |             ^~~~~~~~~~~~~~~
   arch/arc/include/asm/cmpxchg.h:46:60: note: second expression has type 'unsigned char *'
      46 |         unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new));              \
         |                                                            ^~~~~
   include/linux/atomic.h:68:9: note: in expansion of macro 'arch_cmpxchg_relaxed'
      68 |         op##_relaxed(args);                                             \
         |         ^~
   include/linux/atomic/atomic-arch-fallback.h:80:9: note: in expansion of macro '__atomic_op_release'
      80 |         __atomic_op_release(arch_cmpxchg, __VA_ARGS__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/atomic/atomic-instrumented.h:4803:9: note: in expansion of macro 'raw_cmpxchg_release'
    4803 |         raw_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
         |         ^~~~~~~~~~~~~~~~~~~
   fs/crypto/hooks.c:420:13: note: in expansion of macro 'cmpxchg_release'
     420 |             cmpxchg_release(&inode->i_link, NULL, pstr.name) != NULL)
         |             ^~~~~~~~~~~~~~~


vim +46 arch/arc/include/asm/cmpxchg.h

    41	
    42	#define arch_cmpxchg_relaxed(ptr, old, new)				\
    43	({									\
    44		__typeof__(ptr) _p_ = (ptr);					\
    45		unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old));		\
  > 46		unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new));		\
    47		__typeof__(*(ptr)) _prev_;					\
    48										\
    49		switch (sizeof(*(_p_))) {						\
    50		case 1:								\
    51			_prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *__force)_p_, _old_, _new_);	\
    52			break;							\
    53		case 2:								\
    54			_prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u16((volatile u16 *__force)_p_, _old_, _new_);	\
    55			break;							\
    56		case 4:								\
    57			_prev_ = (__typeof__(*(ptr)))__cmpxchg(_p_, _old_, _new_);			\
    58			break;							\
    59		default:							\
    60			BUILD_BUG();						\
    61		}								\
    62		_prev_;								\
    63	})
    64	

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