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Subjectlib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_and_return'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: debe436e77c72fcee804fb867f275e6d31aa999c
commit: 1bdadf46eff6804ace5fa46b6856da4799f12b5c locking/atomic: atomic64: support ARCH_ATOMIC
date: 6 months ago
config: arc-randconfig-r032-20211109 (attached as .config)
compiler: arc-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1bdadf46eff6804ace5fa46b6856da4799f12b5c
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 1bdadf46eff6804ace5fa46b6856da4799f12b5c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_and_return' [-Wmissing-prototypes]
82 | s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
| ^~~~~~~~~~~~~~~~~
lib/atomic64.c:121:9: note: in expansion of macro 'ATOMIC64_OP_RETURN'
121 | ATOMIC64_OP_RETURN(op, c_op) \
| ^~~~~~~~~~~~~~~~~~
lib/atomic64.c:124:1: note: in expansion of macro 'ATOMIC64_OPS'
124 | ATOMIC64_OPS(and, &=)
| ^~~~~~~~~~~~
>> lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_or_return' [-Wmissing-prototypes]
82 | s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
| ^~~~~~~~~~~~~~~~~
lib/atomic64.c:121:9: note: in expansion of macro 'ATOMIC64_OP_RETURN'
121 | ATOMIC64_OP_RETURN(op, c_op) \
| ^~~~~~~~~~~~~~~~~~
lib/atomic64.c:125:1: note: in expansion of macro 'ATOMIC64_OPS'
125 | ATOMIC64_OPS(or, |=)
| ^~~~~~~~~~~~
>> lib/atomic64.c:82:5: warning: no previous prototype for 'generic_atomic64_xor_return' [-Wmissing-prototypes]
82 | s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
| ^~~~~~~~~~~~~~~~~
lib/atomic64.c:121:9: note: in expansion of macro 'ATOMIC64_OP_RETURN'
121 | ATOMIC64_OP_RETURN(op, c_op) \
| ^~~~~~~~~~~~~~~~~~
lib/atomic64.c:126:1: note: in expansion of macro 'ATOMIC64_OPS'
126 | ATOMIC64_OPS(xor, ^=)
| ^~~~~~~~~~~~


vim +/generic_atomic64_and_return +82 lib/atomic64.c

80
81 #define ATOMIC64_OP_RETURN(op, c_op) \
> 82 s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v) \
83 { \
84 unsigned long flags; \
85 raw_spinlock_t *lock = lock_addr(v); \
86 s64 val; \
87 \
88 raw_spin_lock_irqsave(lock, flags); \
89 val = (v->counter c_op a); \
90 raw_spin_unlock_irqrestore(lock, flags); \
91 return val; \
92 } \
93 EXPORT_SYMBOL(generic_atomic64_##op##_return);
94

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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