Commit a015b708 authored by Alexander Potapenko's avatar Alexander Potapenko Committed by Paul E. McKenney
Browse files

compiler_attributes.h: Add __disable_sanitizer_instrumentation 



The new attribute maps to
__attribute__((disable_sanitizer_instrumentation)), which will be
supported by Clang >= 14.0. Future support in GCC is also possible.

This attribute disables compiler instrumentation for kernel sanitizer
tools, making it easier to implement noinstr. It is different from the
existing __no_sanitize* attributes, which may still allow certain types
of instrumentation to prevent false positives.

Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
Signed-off-by: default avatarMarco Elver <elver@google.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 05098119

include/linux/compiler_attributes.h

+18 −0
Original line number Diff line number Diff line
@@ -308,6 +308,24 @@ 
# define __compiletime_warning(msg)

#endif



/*

 * Optional: only supported since clang >= 14.0

 *

 * clang: https://clang.llvm.org/docs/AttributeReference.html#disable-sanitizer-instrumentation

 *

 * disable_sanitizer_instrumentation is not always similar to

 * no_sanitize((<sanitizer-name>)): the latter may still let specific sanitizers

 * insert code into functions to prevent false positives. Unlike that,

 * disable_sanitizer_instrumentation prevents all kinds of instrumentation to

 * functions with the attribute.

 */

#if __has_attribute(disable_sanitizer_instrumentation)

# define __disable_sanitizer_instrumentation \

	 __attribute__((disable_sanitizer_instrumentation))

#else

# define __disable_sanitizer_instrumentation

#endif



/*

 *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-weak-function-attribute

 *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-weak-variable-attribute