[paulmckrcu:cmpxchg2.2026.09.22a 25/28] arch/arc/include/asm/cmpxchg.h:71:23: warning: unused variable '_new_'
kernel test robot
lkp at intel.com
Wed Sep 23 14:12:09 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-randconfig-1001-20260924 (https://download.01.org/0day-ci/archive/20260924/202609240539.AkulvjVe-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260924/202609240539.AkulvjVe-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/202609240539.AkulvjVe-lkp@intel.com/
All warnings (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 kernel/bounds.c:14:
include/linux/atomic/atomic-arch-fallback.h: In function 'raw_atomic_cmpxchg':
arch/arc/include/asm/cmpxchg.h:80:23: error: '_o_' undeclared (first use in this function); did you mean '_p_'?
80 | if (_prev_ == _o_) \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2026:16: note: in expansion of macro 'raw_cmpxchg'
2026 | return raw_cmpxchg(&v->counter, old, new);
| ^~~~~~~~~~~
arch/arc/include/asm/cmpxchg.h:80:23: note: each undeclared identifier is reported only once for each function it appears in
80 | if (_prev_ == _o_) \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2026:16: note: in expansion of macro 'raw_cmpxchg'
2026 | return raw_cmpxchg(&v->counter, old, new);
| ^~~~~~~~~~~
arch/arc/include/asm/cmpxchg.h:81:24: error: '_n_' undeclared (first use in this function); did you mean '_p_'?
81 | *_p_ = _n_; \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2026:16: note: in expansion of macro 'raw_cmpxchg'
2026 | return raw_cmpxchg(&v->counter, old, new);
| ^~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:71:23: warning: unused variable '_new_' [-Wunused-variable]
71 | unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2026:16: note: in expansion of macro 'raw_cmpxchg'
2026 | return raw_cmpxchg(&v->counter, old, new);
| ^~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:70:23: warning: unused variable '_old_' [-Wunused-variable]
70 | unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2026:16: note: in expansion of macro 'raw_cmpxchg'
2026 | return raw_cmpxchg(&v->counter, old, new);
| ^~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h: In function 'raw_atomic_cmpxchg_acquire':
arch/arc/include/asm/cmpxchg.h:80:23: error: '_o_' undeclared (first use in this function); did you mean '_p_'?
80 | if (_prev_ == _o_) \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:70:29: note: in expansion of macro 'arch_cmpxchg'
70 | #define raw_cmpxchg_acquire arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2055:16: note: in expansion of macro 'raw_cmpxchg_acquire'
2055 | return raw_cmpxchg_acquire(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
arch/arc/include/asm/cmpxchg.h:81:24: error: '_n_' undeclared (first use in this function); did you mean '_p_'?
81 | *_p_ = _n_; \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:70:29: note: in expansion of macro 'arch_cmpxchg'
70 | #define raw_cmpxchg_acquire arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2055:16: note: in expansion of macro 'raw_cmpxchg_acquire'
2055 | return raw_cmpxchg_acquire(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:71:23: warning: unused variable '_new_' [-Wunused-variable]
71 | unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:70:29: note: in expansion of macro 'arch_cmpxchg'
70 | #define raw_cmpxchg_acquire arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2055:16: note: in expansion of macro 'raw_cmpxchg_acquire'
2055 | return raw_cmpxchg_acquire(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:70:23: warning: unused variable '_old_' [-Wunused-variable]
70 | unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:70:29: note: in expansion of macro 'arch_cmpxchg'
70 | #define raw_cmpxchg_acquire arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2055:16: note: in expansion of macro 'raw_cmpxchg_acquire'
2055 | return raw_cmpxchg_acquire(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h: In function 'raw_atomic_cmpxchg_release':
arch/arc/include/asm/cmpxchg.h:80:23: error: '_o_' undeclared (first use in this function); did you mean '_p_'?
80 | if (_prev_ == _o_) \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:82:29: note: in expansion of macro 'arch_cmpxchg'
82 | #define raw_cmpxchg_release arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2083:16: note: in expansion of macro 'raw_cmpxchg_release'
2083 | return raw_cmpxchg_release(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
arch/arc/include/asm/cmpxchg.h:81:24: error: '_n_' undeclared (first use in this function); did you mean '_p_'?
81 | *_p_ = _n_; \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:82:29: note: in expansion of macro 'arch_cmpxchg'
82 | #define raw_cmpxchg_release arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2083:16: note: in expansion of macro 'raw_cmpxchg_release'
2083 | return raw_cmpxchg_release(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:71:23: warning: unused variable '_new_' [-Wunused-variable]
71 | unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:82:29: note: in expansion of macro 'arch_cmpxchg'
82 | #define raw_cmpxchg_release arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2083:16: note: in expansion of macro 'raw_cmpxchg_release'
2083 | return raw_cmpxchg_release(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:70:23: warning: unused variable '_old_' [-Wunused-variable]
70 | unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:82:29: note: in expansion of macro 'arch_cmpxchg'
82 | #define raw_cmpxchg_release arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2083:16: note: in expansion of macro 'raw_cmpxchg_release'
2083 | return raw_cmpxchg_release(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h: In function 'raw_atomic_cmpxchg_relaxed':
arch/arc/include/asm/cmpxchg.h:80:23: error: '_o_' undeclared (first use in this function); did you mean '_p_'?
80 | if (_prev_ == _o_) \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:91:29: note: in expansion of macro 'arch_cmpxchg'
91 | #define raw_cmpxchg_relaxed arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
arch/arc/include/asm/cmpxchg.h:81:24: error: '_n_' undeclared (first use in this function); did you mean '_p_'?
81 | *_p_ = _n_; \
| ^~~
include/linux/atomic/atomic-arch-fallback.h:91:29: note: in expansion of macro 'arch_cmpxchg'
91 | #define raw_cmpxchg_relaxed arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:71:23: warning: unused variable '_new_' [-Wunused-variable]
71 | unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:91:29: note: in expansion of macro 'arch_cmpxchg'
91 | #define raw_cmpxchg_relaxed arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
>> arch/arc/include/asm/cmpxchg.h:70:23: warning: unused variable '_old_' [-Wunused-variable]
70 | unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old)); \
| ^~~~~
include/linux/atomic/atomic-arch-fallback.h:91:29: note: in expansion of macro 'arch_cmpxchg'
91 | #define raw_cmpxchg_relaxed arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:2108:16: note: in expansion of macro 'raw_cmpxchg_relaxed'
2108 | return raw_cmpxchg_relaxed(&v->counter, old, new);
| ^~~~~~~~~~~~~~~~~~~
make[3]: *** [scripts/Makefile.build:185: kernel/bounds.s] Error 1 shuffle=1050985161
make[3]: Target 'prepare' not remade because of errors.
make[2]: *** [Makefile:1425: prepare0] Error 2 shuffle=1050985161
make[2]: Target 'prepare' not remade because of errors.
make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=1050985161
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:248: __sub-make] Error 2 shuffle=1050985161
make: Target 'prepare' not remade because of errors.
vim +/_new_ +71 arch/arc/include/asm/cmpxchg.h
66
67 #define arch_cmpxchg(ptr, old, new) \
68 ({ \
69 volatile __typeof__(ptr) _p_ = (ptr); \
> 70 unsigned long _old_ = (unsigned long)(0 ? *(_p_) : (old)); \
> 71 unsigned long _new_ = (unsigned long)(0 ? *(_p_) : (new)); \
72 __typeof__(*(ptr)) _prev_; \
73 unsigned long __flags; \
74 \
75 /* \
76 * spin lock/unlock provide the needed smp_mb() before/after \
77 */ \
78 atomic_ops_lock(__flags); \
79 _prev_ = *_p_; \
80 if (_prev_ == _o_) \
81 *_p_ = _n_; \
82 atomic_ops_unlock(__flags); \
83 _prev_; \
84 })
85
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