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| author | Kees Cook <kees@kernel.org> | 2025-04-16 10:20:20 -0700 |
|---|---|---|
| committer | Kees Cook <kees@kernel.org> | 2025-04-28 10:32:43 -0700 |
| commit | a510c186abfc870e5c74cf953b646c8a2c07bee1 (patch) | |
| tree | b2556de4fa96acb35a18f1c522efb0a0982a4ff6 | |
| parent | 0d6efa20e384a41a7f4afdcd8a0aec442c19d33e (diff) | |
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: Miguel Ojeda <ojeda@kernel.org>
Link: https://lore.kernel.org/r/20250416172016.work.154-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
| -rw-r--r-- | include/linux/compiler_types.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 501cffddc2f4..20881cc761fa 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -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) |