Re: [PATCH 7/7] Compiler Attributes: use feature checks instead of version checks

From: kbuild test robot
Date: Sat Sep 01 2018 - 05:27:53 EST

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Hi Miguel,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.19-rc1 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Miguel-Ojeda/Compiler-Attributes-remove-unused-attributes/20180901-125644
config: sh-titan_defconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=sh

All warnings (new ones prefixed by >>):

In file included from include/linux/byteorder/little_endian.h:5:0,
from arch/sh/include/uapi/asm/byteorder.h:6,
from arch/sh/include/asm/bitops.h:12,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/uapi/linux/byteorder/little_endian.h:84:1: warning: 'gnu_inline' attribute ignored [-Wattributes]
static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
^~~~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: 'no_instrument_function' attribute applies only to functions
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/uapi/linux/byteorder/little_endian.h:84:8: note: in expansion of macro '__always_inline'
static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
^~~~~~~~~~~~~~~
In file included from include/linux/byteorder/little_endian.h:5:0,
from arch/sh/include/uapi/asm/byteorder.h:6,
from arch/sh/include/asm/bitops.h:12,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/uapi/linux/byteorder/little_endian.h:84:1: warning: 'always_inline' attribute ignored [-Wattributes]
static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
^~~~~~
include/uapi/linux/byteorder/little_endian.h:84:24: error: expected ',' or ';' before '__be16'
static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
^~~~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: type defaults to 'int' in declaration of '__always_inline' [-Werror=implicit-int]
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/uapi/linux/byteorder/little_endian.h:88:8: note: in expansion of macro '__always_inline'
static __always_inline __u16 __be16_to_cpup(const __be16 *p)
^~~~~~~~~~~~~~~
In file included from include/linux/byteorder/little_endian.h:5:0,
from arch/sh/include/uapi/asm/byteorder.h:6,
from arch/sh/include/asm/bitops.h:12,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/uapi/linux/byteorder/little_endian.h:88:1: warning: 'gnu_inline' attribute ignored [-Wattributes]
static __always_inline __u16 __be16_to_cpup(const __be16 *p)
^~~~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: 'no_instrument_function' attribute applies only to functions
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/uapi/linux/byteorder/little_endian.h:88:8: note: in expansion of macro '__always_inline'
static __always_inline __u16 __be16_to_cpup(const __be16 *p)
^~~~~~~~~~~~~~~
In file included from include/linux/byteorder/little_endian.h:5:0,
from arch/sh/include/uapi/asm/byteorder.h:6,
from arch/sh/include/asm/bitops.h:12,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/uapi/linux/byteorder/little_endian.h:88:1: warning: 'always_inline' attribute ignored [-Wattributes]
static __always_inline __u16 __be16_to_cpup(const __be16 *p)
^~~~~~
include/uapi/linux/byteorder/little_endian.h:88:24: error: expected ',' or ';' before '__u16'
static __always_inline __u16 __be16_to_cpup(const __be16 *p)
^~~~~
In file included from include/asm-generic/bug.h:5:0,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/linux/atomic.h: In function 'atomic_fetch_add_unless':
include/linux/compiler.h:252:3: error: implicit declaration of function '__read_once_size' [-Werror=implicit-function-declaration]
__read_once_size(&(x), __u.__c, sizeof(x)); \
^
include/linux/compiler.h:258:22: note: in expansion of macro '__READ_ONCE'
#define READ_ONCE(x) __READ_ONCE(x, 1)
^~~~~~~~~~~
>> arch/sh/include/asm/atomic.h:24:25: note: in expansion of macro 'READ_ONCE'
#define atomic_read(v) READ_ONCE((v)->counter)
^~~~~~~~~
include/linux/atomic.h:575:10: note: in expansion of macro 'atomic_read'
int c = atomic_read(v);
^~~~~~~~~~~
include/linux/compiler.h:254:3: error: implicit declaration of function '__read_once_size_nocheck' [-Werror=implicit-function-declaration]
__read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \
^
include/linux/compiler.h:258:22: note: in expansion of macro '__READ_ONCE'
#define READ_ONCE(x) __READ_ONCE(x, 1)
^~~~~~~~~~~
>> arch/sh/include/asm/atomic.h:24:25: note: in expansion of macro 'READ_ONCE'
#define atomic_read(v) READ_ONCE((v)->counter)
^~~~~~~~~
include/linux/atomic.h:575:10: note: in expansion of macro 'atomic_read'
int c = atomic_read(v);
^~~~~~~~~~~
include/asm-generic/atomic-long.h: In function 'atomic_long_set':
include/linux/compiler.h:277:2: error: implicit declaration of function '__write_once_size'; did you mean '__builtin_object_size'? [-Werror=implicit-function-declaration]
__write_once_size(&(x), __u.__c, sizeof(x)); \
^
>> arch/sh/include/asm/atomic.h:25:26: note: in expansion of macro 'WRITE_ONCE'
#define atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
^~~~~~~~~~
include/asm-generic/atomic-long.h:35:28: note: in expansion of macro 'atomic_set'
#define ATOMIC_LONG_PFX(x) atomic ## x
^~~~~~
include/asm-generic/atomic-long.h:57:2: note: in expansion of macro 'ATOMIC_LONG_PFX'
ATOMIC_LONG_PFX(_set##mo)(v, i); \
^~~~~~~~~~~~~~~
include/asm-generic/atomic-long.h:59:1: note: in expansion of macro 'ATOMIC_LONG_SET_OP'
ATOMIC_LONG_SET_OP()
^~~~~~~~~~~~~~~~~~
In file included from <command-line>:0:0:
include/asm-generic/atomic-long.h: At top level:
include/linux/compiler_types.h:187:16: error: type defaults to 'int' in declaration of '__always_inline' [-Werror=implicit-int]
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/asm-generic/atomic-long.h:119:8: note: in expansion of macro '__always_inline'
static __always_inline void atomic_long_inc(atomic_long_t *l)
^~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:1315:0,
from include/asm-generic/bitops/atomic.h:5,
from arch/sh/include/asm/bitops.h:25,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/asm-generic/atomic-long.h:119:1: warning: 'gnu_inline' attribute ignored [-Wattributes]
static __always_inline void atomic_long_inc(atomic_long_t *l)
^~~~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: 'no_instrument_function' attribute applies only to functions
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/asm-generic/atomic-long.h:119:8: note: in expansion of macro '__always_inline'
static __always_inline void atomic_long_inc(atomic_long_t *l)
^~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:1315:0,
from include/asm-generic/bitops/atomic.h:5,
from arch/sh/include/asm/bitops.h:25,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/asm-generic/atomic-long.h:119:1: warning: 'always_inline' attribute ignored [-Wattributes]
static __always_inline void atomic_long_inc(atomic_long_t *l)
^~~~~~
include/asm-generic/atomic-long.h:119:24: error: expected ',' or ';' before 'void'
static __always_inline void atomic_long_inc(atomic_long_t *l)
^~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: type defaults to 'int' in declaration of '__always_inline' [-Werror=implicit-int]
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/asm-generic/atomic-long.h:126:8: note: in expansion of macro '__always_inline'
static __always_inline void atomic_long_dec(atomic_long_t *l)
^~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:1315:0,
from include/asm-generic/bitops/atomic.h:5,
from arch/sh/include/asm/bitops.h:25,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/sh/include/asm/bug.h:112,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/asm-generic/atomic-long.h:126:1: warning: 'gnu_inline' attribute ignored [-Wattributes]
static __always_inline void atomic_long_dec(atomic_long_t *l)
^~~~~~
In file included from <command-line>:0:0:
include/linux/compiler_types.h:187:16: error: 'no_instrument_function' attribute applies only to functions
#define inline __always_inline __gnu_inline __maybe_unused notrace
^
include/linux/compiler_attributes.h:48:33: note: in expansion of macro 'inline'
#define __always_inline inline __attribute__((always_inline))
^~~~~~
include/asm-generic/atomic-long.h:126:8: note: in expansion of macro '__always_inline'
static __always_inline void atomic_long_dec(atomic_long_t *l)
^~~~~~~~~~~~~~~
In file included from include/linux/atomic.h:1315:0,
from include/asm-generic/bitops/atomic.h:5,
from arch/sh/include/asm/bitops.h:25,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,

vim +/READ_ONCE +24 arch/sh/include/asm/atomic.h

^1da177e include/asm-sh/atomic.h Linus Torvalds 2005-04-16 23
62e8a325 arch/sh/include/asm/atomic.h Peter Zijlstra 2015-09-18 @24 #define atomic_read(v) READ_ONCE((v)->counter)
62e8a325 arch/sh/include/asm/atomic.h Peter Zijlstra 2015-09-18 @25 #define atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
^1da177e include/asm-sh/atomic.h Linus Torvalds 2005-04-16 26

:::::: The code at line 24 was first introduced by commit
:::::: 62e8a3258bda118f24ff462fe04cfbe75b8189b5 atomic, arch: Audit atomic_{read,set}()

:::::: TO: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
:::::: CC: Ingo Molnar <mingo@xxxxxxxxxx>

---
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