[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 at intel.com
Thu Sep 24 00:51:13 PDT 2026
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 at 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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