Re: [PATCH 1/5] kexec_core: move kdump related codes from crash_core.c to kexec_core.c

From: kernel test robot
Date: Sat Jan 06 2024 - 06:00:55 EST

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In reply to: Baoquan He: "[PATCH 1/5] kexec_core: move kdump related codes from crash_core.c to kexec_core.c"
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Hi Baoquan,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.7-rc8]
[cannot apply to powerpc/next powerpc/fixes tip/x86/core arm64/for-next/core next-20240105]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/kexec_core-move-kdump-related-codes-from-crash_core-c-to-kexec_core-c/20240105-223735
base: linus/master
patch link: https://lore.kernel.org/r/20240105103305.557273-2-bhe%40redhat.com
patch subject: [PATCH 1/5] kexec_core: move kdump related codes from crash_core.c to kexec_core.c
config: x86_64-randconfig-104-20240106 (https://download.01.org/0day-ci/archive/20240106/202401061800.3XPSaPsa-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240106/202401061800.3XPSaPsa-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401061800.3XPSaPsa-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

In file included from include/linux/string.h:11,
from include/linux/bitmap.h:12,
from include/linux/cpumask.h:12,
from include/linux/smp.h:13,
from arch/x86/kernel/crash.c:18:
arch/x86/kernel/crash.c: In function 'fill_up_crash_elf_data':
>> include/linux/overflow.h:293:23: error: invalid application of 'sizeof' to incomplete type 'struct crash_mem'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
>> include/linux/overflow.h:277:38: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
In file included from include/linux/container_of.h:5,
from include/linux/kernel.h:22,
from arch/x86/kernel/crash.c:17:
include/linux/overflow.h:277:69: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:277:69: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:44: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:75: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:75: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:293:32: note: in expansion of macro 'flex_array_size'
293 | sizeof(*(p)) + flex_array_size(p, member, count), \
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:294:32: error: invalid application of 'sizeof' to incomplete type 'struct crash_mem'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
>> include/linux/overflow.h:277:38: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:277:69: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:277:69: error: invalid use of undefined type 'struct crash_mem'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/overflow.h:277:50: note: in expansion of macro '__must_be_array'
277 | (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:44: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:75: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/overflow.h:278:75: error: invalid use of undefined type 'struct crash_mem'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:51: note: in expansion of macro '__same_type'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:228:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
228 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/overflow.h:278:56: note: in expansion of macro '__must_be_array'
278 | size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
| ^~~~~~~~~~~~~~~
include/linux/overflow.h:294:40: note: in expansion of macro 'flex_array_size'
294 | size_add(sizeof(*(p)), flex_array_size(p, member, count)))
| ^~~~~~~~~~~~~~~
arch/x86/kernel/crash.c:154:24: note: in expansion of macro 'struct_size'
154 | cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
| ^~~~~~~~~~~
>> arch/x86/kernel/crash.c:158:13: error: invalid use of undefined type 'struct crash_mem'
158 | cmem->max_nr_ranges = nr_ranges;
| ^~
arch/x86/kernel/crash.c:159:13: error: invalid use of undefined type 'struct crash_mem'
159 | cmem->nr_ranges = 0;
| ^~
arch/x86/kernel/crash.c: In function 'elf_header_exclude_ranges':
>> arch/x86/kernel/crash.c:173:15: error: implicit declaration of function 'crash_exclude_mem_range' [-Werror=implicit-function-declaration]
173 | ret = crash_exclude_mem_range(cmem, 0, (1<<20)-1);
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/crash.c: In function 'prepare_elf64_ram_headers_callback':
arch/x86/kernel/crash.c:193:13: error: invalid use of undefined type 'struct crash_mem'
193 | cmem->ranges[cmem->nr_ranges].start = res->start;
| ^~
arch/x86/kernel/crash.c:193:26: error: invalid use of undefined type 'struct crash_mem'
193 | cmem->ranges[cmem->nr_ranges].start = res->start;
| ^~
arch/x86/kernel/crash.c:194:13: error: invalid use of undefined type 'struct crash_mem'
194 | cmem->ranges[cmem->nr_ranges].end = res->end;
| ^~
arch/x86/kernel/crash.c:194:26: error: invalid use of undefined type 'struct crash_mem'
194 | cmem->ranges[cmem->nr_ranges].end = res->end;
| ^~
arch/x86/kernel/crash.c:195:13: error: invalid use of undefined type 'struct crash_mem'
195 | cmem->nr_ranges++;
| ^~
arch/x86/kernel/crash.c: In function 'prepare_elf_headers':
arch/x86/kernel/crash.c:221:30: error: invalid use of undefined type 'struct crash_mem'
221 | *nr_mem_ranges = cmem->nr_ranges;
| ^~
>> arch/x86/kernel/crash.c:224:16: error: implicit declaration of function 'crash_prepare_elf64_headers'; did you mean 'prepare_elf_headers'? [-Werror=implicit-function-declaration]
224 | ret = crash_prepare_elf64_headers(cmem, IS_ENABLED(CONFIG_X86_64), addr, sz);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
| prepare_elf_headers
cc1: some warnings being treated as errors

vim +293 include/linux/overflow.h

610b15c50e86eb Kees Cook 2018-05-07 262
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 263 /**
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 264 * flex_array_size() - Calculate size of a flexible array member
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 265 * within an enclosing structure.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 266 * @p: Pointer to the structure.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 267 * @member: Name of the flexible array member.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 268 * @count: Number of elements in the array.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 269 *
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 270 * Calculates size of a flexible array of @count number of @member
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 271 * elements, at the end of structure @p.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 272 *
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 273 * Return: number of bytes needed or SIZE_MAX on overflow.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 274 */
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 275 #define flex_array_size(p, member, count) \
230f6fa2c1db6a Kees Cook 2022-02-09 276 __builtin_choose_expr(__is_constexpr(count), \
230f6fa2c1db6a Kees Cook 2022-02-09 @277 (count) * sizeof(*(p)->member) + __must_be_array((p)->member), \
230f6fa2c1db6a Kees Cook 2022-02-09 278 size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 279
e1be43d9b5d0d1 Kees Cook 2021-09-18 280 /**
e1be43d9b5d0d1 Kees Cook 2021-09-18 281 * struct_size() - Calculate size of structure with trailing flexible array.
e1be43d9b5d0d1 Kees Cook 2021-09-18 282 * @p: Pointer to the structure.
e1be43d9b5d0d1 Kees Cook 2021-09-18 283 * @member: Name of the array member.
e1be43d9b5d0d1 Kees Cook 2021-09-18 284 * @count: Number of elements in the array.
e1be43d9b5d0d1 Kees Cook 2021-09-18 285 *
d67790ddf0219a Kees Cook 2023-05-22 286 * Calculates size of memory needed for structure of @p followed by an
e1be43d9b5d0d1 Kees Cook 2021-09-18 287 * array of @count number of @member elements.
e1be43d9b5d0d1 Kees Cook 2021-09-18 288 *
e1be43d9b5d0d1 Kees Cook 2021-09-18 289 * Return: number of bytes needed or SIZE_MAX on overflow.
e1be43d9b5d0d1 Kees Cook 2021-09-18 290 */
e1be43d9b5d0d1 Kees Cook 2021-09-18 291 #define struct_size(p, member, count) \
230f6fa2c1db6a Kees Cook 2022-02-09 292 __builtin_choose_expr(__is_constexpr(count), \
230f6fa2c1db6a Kees Cook 2022-02-09 @293 sizeof(*(p)) + flex_array_size(p, member, count), \
230f6fa2c1db6a Kees Cook 2022-02-09 294 size_add(sizeof(*(p)), flex_array_size(p, member, count)))
e1be43d9b5d0d1 Kees Cook 2021-09-18 295

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