Merge tag 'trace-v5.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...

[linux-2.6-microblaze.git] / include / linux / compiler-clang.h

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index adbe76b..49b0ac8 100644 (file)
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -13,6 +13,12 @@
 /* all clang versions usable with the kernel support KASAN ABI version 5 */
 #define KASAN_ABI_VERSION 5
 
+/*
+ * Note: Checking __has_feature(*_sanitizer) is only true if the feature is
+ * enabled. Therefore it is not required to additionally check defined(CONFIG_*)
+ * to avoid adding redundant attributes in other configurations.
+ */
+
 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */
 #define __SANITIZE_ADDRESS__
@@ -45,6 +51,17 @@
 #define __no_sanitize_undefined
 #endif
 
+/*
+ * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
+ * with no_sanitize("coverage"). Prior versions of Clang support coverage
+ * instrumentation, but cannot be queried for support by the preprocessor.
+ */
+#if __has_feature(coverage_sanitizer)
+#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
+#else
+#define __no_sanitize_coverage
+#endif
+
 /*
  * Not all versions of clang implement the type-generic versions
  * of the builtin overflow checkers. Fortunately, clang implements