Re: [PATCH 3/7] Compiler Attributes: remove unneeded tests

From: kbuild test robot
Date: Sat Sep 01 2018 - 04:20:45 EST

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Hi Miguel,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR 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: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

Note: the linux-review/Miguel-Ojeda/Compiler-Attributes-remove-unused-attributes/20180901-125644 HEAD 4327b9ceea1b6be41cbce2c51370a365fc6a52cc builds fine.
It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

In file included from include/uapi/linux/swab.h:7:0,
from include/linux/swab.h:5,
from include/uapi/linux/byteorder/little_endian.h:13,
from include/linux/byteorder/little_endian.h:5,
from arch/x86/include/uapi/asm/byteorder.h:5,
from include/asm-generic/bitops/le.h:6,
from arch/x86/include/asm/bitops.h:521,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
>> arch/x86/include/uapi/asm/swab.h:8:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/include/uapi/asm/swab.h:8:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__arch_swab32'
static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
^~~~~~~~~~~~~
arch/x86/include/uapi/asm/swab.h:15:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
^~~~~~~~~~~~~~~~~~~
>> arch/x86/include/uapi/asm/swab.h:15:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__arch_swab64'
static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
^~~~~~~~~~~~~
In file included from include/linux/swab.h:5:0,
from include/uapi/linux/byteorder/little_endian.h:13,
from include/linux/byteorder/little_endian.h:5,
from arch/x86/include/uapi/asm/byteorder.h:5,
from include/asm-generic/bitops/le.h:6,
from arch/x86/include/asm/bitops.h:521,
from include/linux/bitops.h:19,
from include/linux/kernel.h:11,
from include/asm-generic/bug.h:18,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
>> include/uapi/linux/swab.h:47:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u16 __fswab16(__u16 val)
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/swab.h:47:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__fswab16'
static inline __attribute_const__ __u16 __fswab16(__u16 val)
^~~~~~~~~
include/uapi/linux/swab.h:56:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u32 __fswab32(__u32 val)
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/swab.h:56:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__fswab32'
static inline __attribute_const__ __u32 __fswab32(__u32 val)
^~~~~~~~~
include/uapi/linux/swab.h:65:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u64 __fswab64(__u64 val)
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/swab.h:65:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__fswab64'
static inline __attribute_const__ __u64 __fswab64(__u64 val)
^~~~~~~~~
include/uapi/linux/swab.h:78:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u32 __fswahw32(__u32 val)
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/swab.h:78:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__fswahw32'
static inline __attribute_const__ __u32 __fswahw32(__u32 val)
^~~~~~~~~~
include/uapi/linux/swab.h:87:15: error: unknown type name '__attribute_const__'
static inline __attribute_const__ __u32 __fswahb32(__u32 val)
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/swab.h:87:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__fswahb32'
static inline __attribute_const__ __u32 __fswahb32(__u32 val)
^~~~~~~~~~
include/uapi/linux/swab.h: In function '__swahw32p':
>> include/uapi/linux/swab.h:144:2: error: implicit declaration of function '__fswahw32'; did you mean '__swahw32'? [-Werror=implicit-function-declaration]
__fswahw32(x))
^
>> include/uapi/linux/swab.h:207:9: note: in expansion of macro '__swahw32'
return __swahw32(*p);
^~~~~~~~~
include/uapi/linux/swab.h: In function '__swahb32p':
>> include/uapi/linux/swab.h:155:2: error: implicit declaration of function '__fswahb32'; did you mean '__swahb32'? [-Werror=implicit-function-declaration]
__fswahb32(x))
^
>> include/uapi/linux/swab.h:222:9: note: in expansion of macro '__swahb32'
return __swahb32(*p);
^~~~~~~~~
In file included from include/linux/kernel.h:12:0,
from include/asm-generic/bug.h:18,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/page-flags.h:10,
from kernel/bounds.c:10:
include/linux/log2.h: At top level:
>> include/linux/log2.h:202:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
int __order_base_2(unsigned long n)
^~~
cc1: some warnings being treated as errors
make[2]: *** [kernel/bounds.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [sub-make] Error 2

vim +/__attribute_const__ +8 arch/x86/include/uapi/asm/swab.h

5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 7
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 @8 static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 9 {
e5bb8ad8 arch/x86/include/asm/swab.h H. Peter Anvin 2012-11-28 10 asm("bswapl %0" : "=r" (val) : "0" (val));
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 11 return val;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 12 }
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 13 #define __arch_swab32 __arch_swab32
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 14
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 @15 static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 16 {
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 17 #ifdef __i386__
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 18 union {
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 19 struct {
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 20 __u32 a;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 21 __u32 b;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 22 } s;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 23 __u64 u;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 24 } v;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 25 v.u = val;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 26 asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 27 : "=r" (v.s.a), "=r" (v.s.b)
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 28 : "0" (v.s.a), "1" (v.s.b));
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 29 return v.u;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 30 #else /* __i386__ */
e5bb8ad8 arch/x86/include/asm/swab.h H. Peter Anvin 2012-11-28 31 asm("bswapq %0" : "=r" (val) : "0" (val));
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 32 return val;
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 33 #endif
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 34 }
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 35 #define __arch_swab64 __arch_swab64
5d30a683 arch/x86/include/asm/swab.h Harvey Harrison 2009-01-06 36

:::::: The code at line 8 was first introduced by commit
:::::: 5d30a683888c60b8f93bef3ddc139d1a91ca58f4 x86: introduce asm/swab.h

:::::: TO: Harvey Harrison <harvey.harrison@xxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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Next message: Christoph Hellwig: "Re: [PATCH v5 01/13] PCI/P2PDMA: Support peer-to-peer memory"
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Next in thread: kbuild test robot: "Re: [PATCH 3/7] Compiler Attributes: remove unneeded tests"
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