tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

overflow: Clarify expectations for getting DEFINE_FLEX variable sizes

Mention the use of __member_size() for DEFINE_FLEX variables as a hint
for getting at the compile-time size of the resulting flexible array
member.

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20250416172911.work.854-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

Kees Cook 9a930484 a510c186

+2
+2
include/linux/overflow.h
··· 419 419 * Define a zeroed, on-stack, instance of @type structure with a trailing 420 420 * flexible array member. 421 421 * Use __struct_size(@name) to get compile-time size of it afterwards. 422 + * Use __member_size(@name->member) to get compile-time size of @name members. 422 423 */ 423 424 #define DEFINE_RAW_FLEX(type, name, member, count) \ 424 425 _DEFINE_FLEX(type, name, member, count, = {}) ··· 437 436 * Define a zeroed, on-stack, instance of @TYPE structure with a trailing 438 437 * flexible array member. 439 438 * Use __struct_size(@NAME) to get compile-time size of it afterwards. 439 + * Use __member_size(@NAME->member) to get compile-time size of @NAME members. 440 440 */ 441 441 #define DEFINE_FLEX(TYPE, NAME, MEMBER, COUNTER, COUNT) \ 442 442 _DEFINE_FLEX(TYPE, NAME, MEMBER, COUNT, = { .obj.COUNTER = COUNT, })