Re: [PATCH v7 02/28] mm: Introduce struct folio

From: kernel test robot
Date: Fri Apr 09 2021 - 22:52:43 EST

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Hi "Matthew,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20210409]
[also build test ERROR on v5.12-rc6]
[cannot apply to linux/master linus/master hnaz-linux-mm/master v5.12-rc6 v5.12-rc5 v5.12-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Matthew-Wilcox-Oracle/Memory-Folios/20210410-031353
base: e99d8a8495175df8cb8b739f8cf9b0fc9d0cd3b5
config: mips-gpr_defconfig (attached as .config)
compiler: mipsel-linux-gcc (GCC) 9.3.0
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://github.com/0day-ci/linux/commit/5658a201516d2ed74a34c328e3b55f552d4861d8
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Memory-Folios/20210410-031353
git checkout 5658a201516d2ed74a34c328e3b55f552d4861d8
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips

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

All errors (new ones prefixed by >>):

In file included from include/linux/bits.h:22,
from include/linux/bitops.h:6,
from include/linux/log2.h:12,
from include/asm-generic/div64.h:53,
from arch/mips/include/asm/div64.h:12,
from include/linux/math64.h:7,
from include/linux/time.h:6,
from include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, lru) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:274:1: note: in expansion of macro 'FOLIO_MATCH'
274 | FOLIO_MATCH(lru, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, compound_head) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:275:1: note: in expansion of macro 'FOLIO_MATCH'
275 | FOLIO_MATCH(compound_head, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, index) == offsetof(struct folio, index)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:276:1: note: in expansion of macro 'FOLIO_MATCH'
276 | FOLIO_MATCH(index, index);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, private) == offsetof(struct folio, private)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:277:1: note: in expansion of macro 'FOLIO_MATCH'
277 | FOLIO_MATCH(private, private);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _mapcount) == offsetof(struct folio, _mapcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:278:1: note: in expansion of macro 'FOLIO_MATCH'
278 | FOLIO_MATCH(_mapcount, _mapcount);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _refcount) == offsetof(struct folio, _refcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:279:1: note: in expansion of macro 'FOLIO_MATCH'
279 | FOLIO_MATCH(_refcount, _refcount);
| ^~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for 'output_ptreg_defines' [-Wmissing-prototypes]
26 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for 'output_task_defines' [-Wmissing-prototypes]
78 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for 'output_thread_info_defines' [-Wmissing-prototypes]
93 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:109:6: warning: no previous prototype for 'output_thread_defines' [-Wmissing-prototypes]
109 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:137:6: warning: no previous prototype for 'output_thread_fpu_defines' [-Wmissing-prototypes]
137 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:180:6: warning: no previous prototype for 'output_mm_defines' [-Wmissing-prototypes]
180 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:219:6: warning: no previous prototype for 'output_sc_defines' [-Wmissing-prototypes]
219 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:254:6: warning: no previous prototype for 'output_signal_defined' [-Wmissing-prototypes]
254 | void output_signal_defined(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:347:6: warning: no previous prototype for 'output_kvm_defines' [-Wmissing-prototypes]
347 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
--
In file included from include/linux/bits.h:22,
from include/linux/bitops.h:6,
from include/linux/log2.h:12,
from include/asm-generic/div64.h:53,
from arch/mips/include/asm/div64.h:12,
from include/linux/math64.h:7,
from include/linux/time.h:6,
from include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, lru) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:274:1: note: in expansion of macro 'FOLIO_MATCH'
274 | FOLIO_MATCH(lru, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, compound_head) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:275:1: note: in expansion of macro 'FOLIO_MATCH'
275 | FOLIO_MATCH(compound_head, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, index) == offsetof(struct folio, index)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:276:1: note: in expansion of macro 'FOLIO_MATCH'
276 | FOLIO_MATCH(index, index);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, private) == offsetof(struct folio, private)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:277:1: note: in expansion of macro 'FOLIO_MATCH'
277 | FOLIO_MATCH(private, private);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _mapcount) == offsetof(struct folio, _mapcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:278:1: note: in expansion of macro 'FOLIO_MATCH'
278 | FOLIO_MATCH(_mapcount, _mapcount);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _refcount) == offsetof(struct folio, _refcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:279:1: note: in expansion of macro 'FOLIO_MATCH'
279 | FOLIO_MATCH(_refcount, _refcount);
| ^~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for 'output_ptreg_defines' [-Wmissing-prototypes]
26 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for 'output_task_defines' [-Wmissing-prototypes]
78 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for 'output_thread_info_defines' [-Wmissing-prototypes]
93 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:109:6: warning: no previous prototype for 'output_thread_defines' [-Wmissing-prototypes]
109 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:137:6: warning: no previous prototype for 'output_thread_fpu_defines' [-Wmissing-prototypes]
137 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:180:6: warning: no previous prototype for 'output_mm_defines' [-Wmissing-prototypes]
180 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:219:6: warning: no previous prototype for 'output_sc_defines' [-Wmissing-prototypes]
219 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:254:6: warning: no previous prototype for 'output_signal_defined' [-Wmissing-prototypes]
254 | void output_signal_defined(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:347:6: warning: no previous prototype for 'output_kvm_defines' [-Wmissing-prototypes]
347 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:118: arch/mips/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1304: prepare0] Error 2
make[1]: Target 'modules_prepare' not remade because of errors.
make: *** [Makefile:222: __sub-make] Error 2
make: Target 'modules_prepare' not remade because of errors.
--
error: no override and no default toolchain set
init/Kconfig:70:warning: 'RUSTC_VERSION': number is invalid
In file included from include/linux/bits.h:22,
from include/linux/bitops.h:6,
from include/linux/log2.h:12,
from include/asm-generic/div64.h:53,
from arch/mips/include/asm/div64.h:12,
from include/linux/math64.h:7,
from include/linux/time.h:6,
from include/linux/compat.h:10,
from arch/mips/kernel/asm-offsets.c:12:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, lru) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:274:1: note: in expansion of macro 'FOLIO_MATCH'
274 | FOLIO_MATCH(lru, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, compound_head) == offsetof(struct folio, lru)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:275:1: note: in expansion of macro 'FOLIO_MATCH'
275 | FOLIO_MATCH(compound_head, lru);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, index) == offsetof(struct folio, index)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:276:1: note: in expansion of macro 'FOLIO_MATCH'
276 | FOLIO_MATCH(index, index);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, private) == offsetof(struct folio, private)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:277:1: note: in expansion of macro 'FOLIO_MATCH'
277 | FOLIO_MATCH(private, private);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _mapcount) == offsetof(struct folio, _mapcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:278:1: note: in expansion of macro 'FOLIO_MATCH'
278 | FOLIO_MATCH(_mapcount, _mapcount);
| ^~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, _refcount) == offsetof(struct folio, _refcount)"
78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
| ^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
| ^~~~~~~~~~~~~~~
include/linux/mm_types.h:272:2: note: in expansion of macro 'static_assert'
272 | static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
| ^~~~~~~~~~~~~
include/linux/mm_types.h:279:1: note: in expansion of macro 'FOLIO_MATCH'
279 | FOLIO_MATCH(_refcount, _refcount);
| ^~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:26:6: warning: no previous prototype for 'output_ptreg_defines' [-Wmissing-prototypes]
26 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:78:6: warning: no previous prototype for 'output_task_defines' [-Wmissing-prototypes]
78 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:93:6: warning: no previous prototype for 'output_thread_info_defines' [-Wmissing-prototypes]
93 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:109:6: warning: no previous prototype for 'output_thread_defines' [-Wmissing-prototypes]
109 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:137:6: warning: no previous prototype for 'output_thread_fpu_defines' [-Wmissing-prototypes]
137 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:180:6: warning: no previous prototype for 'output_mm_defines' [-Wmissing-prototypes]
180 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:219:6: warning: no previous prototype for 'output_sc_defines' [-Wmissing-prototypes]
219 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:254:6: warning: no previous prototype for 'output_signal_defined' [-Wmissing-prototypes]
254 | void output_signal_defined(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/mips/kernel/asm-offsets.c:347:6: warning: no previous prototype for 'output_kvm_defines' [-Wmissing-prototypes]
347 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:118: arch/mips/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1304: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:222: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.

vim +78 include/linux/build_bug.h

bc6245e5efd70c Ian Abbott 2017-07-10 60
6bab69c65013be Rasmus Villemoes 2019-03-07 61 /**
6bab69c65013be Rasmus Villemoes 2019-03-07 62 * static_assert - check integer constant expression at build time
6bab69c65013be Rasmus Villemoes 2019-03-07 63 *
6bab69c65013be Rasmus Villemoes 2019-03-07 64 * static_assert() is a wrapper for the C11 _Static_assert, with a
6bab69c65013be Rasmus Villemoes 2019-03-07 65 * little macro magic to make the message optional (defaulting to the
6bab69c65013be Rasmus Villemoes 2019-03-07 66 * stringification of the tested expression).
6bab69c65013be Rasmus Villemoes 2019-03-07 67 *
6bab69c65013be Rasmus Villemoes 2019-03-07 68 * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
6bab69c65013be Rasmus Villemoes 2019-03-07 69 * scope, but requires the expression to be an integer constant
6bab69c65013be Rasmus Villemoes 2019-03-07 70 * expression (i.e., it is not enough that __builtin_constant_p() is
6bab69c65013be Rasmus Villemoes 2019-03-07 71 * true for expr).
6bab69c65013be Rasmus Villemoes 2019-03-07 72 *
6bab69c65013be Rasmus Villemoes 2019-03-07 73 * Also note that BUILD_BUG_ON() fails the build if the condition is
6bab69c65013be Rasmus Villemoes 2019-03-07 74 * true, while static_assert() fails the build if the expression is
6bab69c65013be Rasmus Villemoes 2019-03-07 75 * false.
6bab69c65013be Rasmus Villemoes 2019-03-07 76 */
6bab69c65013be Rasmus Villemoes 2019-03-07 @77 #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
6bab69c65013be Rasmus Villemoes 2019-03-07 @78 #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
6bab69c65013be Rasmus Villemoes 2019-03-07 79

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