arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true

From: kernel test robot
Date: Sun Aug 16 2020 - 16:54:58 EST

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Hi Nathan,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 2cc3c4b3c2e9c99e90aaf19cd801ff2c160f283c
commit: afe956c577b2d5a3d9834e4424587c1ebcf90c4c kbuild: Enable -Wtautological-compare
date: 4 months ago
config: mips-randconfig-r001-20200817 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ab9fc8bae805c785066779e76e7846aabad5609e)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
git checkout afe956c577b2d5a3d9834e4424587c1ebcf90c4c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

clang-12: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]
clang-12: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_OPS(atomic, int)
^
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS'
return xchg(&v->counter, n); \
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_OPS(atomic64, s64)
^
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS'
return xchg(&v->counter, n); \
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:258:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
In file included from include/linux/debug_locks.h:6:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:262:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from kernel/bounds.c:14:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
>> include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
9 warnings generated.
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_OPS(atomic, int)
^
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
>> arch/mips/include/asm/atomic.h:49:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS'
return xchg(&v->counter, n); \
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_OPS(atomic64, s64)
^
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:40:9: note: expanded from macro 'ATOMIC_OPS'
return cmpxchg(&v->counter, o, n); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:53:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/atomic.h:45:9: note: expanded from macro 'ATOMIC_OPS'
return xchg(&v->counter, n); \
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:258:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:262:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:252:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:6:
In file included from include/linux/seqlock.h:36:
In file included from include/linux/spinlock.h:83:
In file included from include/linux/spinlock_types.h:18:
In file included from include/linux/lockdep.h:44:
>> include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:10:
In file included from include/linux/time.h:74:
In file included from include/linux/time32.h:13:
In file included from include/linux/timex.h:65:
In file included from arch/mips/include/asm/timex.h:19:
In file included from arch/mips/include/asm/cpu-type.h:12:
In file included from include/linux/smp.h:15:
>> include/linux/llist.h:222:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&head->first, NULL);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:19:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:9:
include/linux/topology.h:119:9: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration]
return cpu_to_node(raw_smp_processor_id());
^
arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node'
#define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:19:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:9:
include/linux/topology.h:176:9: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration]
return cpu_to_node(cpu);
^
arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node'
#define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2)
^
In file included from arch/mips/kernel/asm-offsets.c:12:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:19:
In file included from include/linux/slab.h:15:
In file included from include/linux/gfp.h:9:
include/linux/topology.h:210:25: error: implicit declaration of function 'cpu_logical_map' [-Werror,-Wimplicit-function-declaration]
return cpumask_of_node(cpu_to_node(cpu));
^
arch/mips/include/asm/mach-loongson64/topology.h:7:27: note: expanded from macro 'cpu_to_node'
#define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2)
^
In file included from arch/mips/kernel/asm-offsets.c:15:
In file included from include/linux/mm.h:95:
>> arch/mips/include/asm/pgtable.h:210:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
^
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:15:
In file included from include/linux/mm.h:95:
>> arch/mips/include/asm/pgtable.h:210:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:24:
>> include/linux/kvm_host.h:332:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/asm-offsets.c:24:
>> include/linux/kvm_host.h:332:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for function 'output_ptreg_defines' [-Wmissing-prototypes]
void output_ptreg_defines(void)
^
arch/mips/kernel/asm-offsets.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_ptreg_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for function 'output_task_defines' [-Wmissing-prototypes]
void output_task_defines(void)
^
arch/mips/kernel/asm-offsets.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_task_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for function 'output_thread_info_defines' [-Wmissing-prototypes]
void output_thread_info_defines(void)
^
arch/mips/kernel/asm-offsets.c:93:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_thread_info_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:110:6: warning: no previous prototype for function 'output_thread_defines' [-Wmissing-prototypes]
void output_thread_defines(void)
^
arch/mips/kernel/asm-offsets.c:110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_thread_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:181:6: warning: no previous prototype for function 'output_mm_defines' [-Wmissing-prototypes]
void output_mm_defines(void)
^
arch/mips/kernel/asm-offsets.c:181:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_mm_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:242:6: warning: no previous prototype for function 'output_sc_defines' [-Wmissing-prototypes]
void output_sc_defines(void)
^
arch/mips/kernel/asm-offsets.c:242:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_sc_defines(void)
^
static
arch/mips/kernel/asm-offsets.c:255:6: warning: no previous prototype for function 'output_signal_defined' [-Wmissing-prototypes]
void output_signal_defined(void)
^
arch/mips/kernel/asm-offsets.c:255:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_signal_defined(void)
^
static
arch/mips/kernel/asm-offsets.c:322:6: warning: no previous prototype for function 'output_pbe_defines' [-Wmissing-prototypes]
void output_pbe_defines(void)
^
arch/mips/kernel/asm-offsets.c:322:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void output_pbe_defines(void)
^
static
22 warnings and 3 errors generated.
make[2]: *** [scripts/Makefile.build:101: arch/mips/kernel/asm-offsets.s] Error 1
make[2]: Target 'missing-syscalls' not remade because of errors.
make[1]: *** [arch/mips/Makefile:414: archprepare] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:180: sub-make] Error 2
make: Target 'prepare' not remade because of errors.

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=afe956c577b2d5a3d9834e4424587c1ebcf90c4c
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout afe956c577b2d5a3d9834e4424587c1ebcf90c4c
vim +49 arch/mips/include/asm/atomic.h

^1da177e4c3f41 include/asm-mips/atomic.h Linus Torvalds 2005-04-16 47
1da7bce8591d58 arch/mips/include/asm/atomic.h Paul Burton 2019-10-01 48 #define ATOMIC_INIT(i) { (i) }
1da7bce8591d58 arch/mips/include/asm/atomic.h Paul Burton 2019-10-01 @49 ATOMIC_OPS(atomic, int)
^1da177e4c3f41 include/asm-mips/atomic.h Linus Torvalds 2005-04-16 50

:::::: The code at line 49 was first introduced by commit
:::::: 1da7bce8591d58bf2a442b0324659af7390401c2 MIPS: atomic: Deduplicate 32b & 64b read, set, xchg, cmpxchg

:::::: TO: Paul Burton <paul.burton@xxxxxxxx>
:::::: CC: Paul Burton <paul.burton@xxxxxxxx>

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

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