Commit a510c186 authored by Kees Cook's avatar Kees Cook
Browse files

compiler_types: Identify compiler versions for __builtin_dynamic_object_size 



Clarify when __builtin_dynamic_object_size() is available. All our
supported Clang versions support it. GCC 12 and later support it. Link
to documentation for both.

Acked-by: default avatarMiguel Ojeda <ojeda@kernel.org>
Link: https://lore.kernel.org/r/20250416172016.work.154-kees@kernel.org


Signed-off-by: default avatarKees Cook <kees@kernel.org>
parent 0d6efa20

include/linux/compiler_types.h

+5 −0
Original line number Diff line number Diff line
@@ -449,6 +449,11 @@ struct ftrace_likely_data { 
/*

 * When the size of an allocated object is needed, use the best available

 * mechanism to find it. (For cases where sizeof() cannot be used.)

 *

 * Optional: only supported since gcc >= 12

 *

 *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html

 * clang: https://clang.llvm.org/docs/LanguageExtensions.html#evaluating-object-size

 */

#if __has_builtin(__builtin_dynamic_object_size)

#define __struct_size(p)	__builtin_dynamic_object_size(p, 0)