The patch titled
Subject: kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2
has been added to the -mm tree. Its filename is
kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2.patch
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------------------------------------------------------
From: Marco Elver <elver@xxxxxxxxxx>
Subject: kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2
Implement __has_feature(coverage_sanitizer) in Clang
(https://reviews.llvm.org/D103159) and use instead of version check.
Link: https://lkml.kernel.org/r/20210527162655.3246381-1-elver@xxxxxxxxxx
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Miguel Ojeda <ojeda@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-clang.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/include/linux/compiler-clang.h~kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2
+++ a/include/linux/compiler-clang.h
@@ -45,7 +45,12 @@
#define __no_sanitize_undefined
#endif
-#if defined(CONFIG_KCOV) && CONFIG_CLANG_VERSION >= 130000
+/*
+ * 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
_
Patches currently in -mm which might be from elver@xxxxxxxxxx are
kfence-use-task_idle-when-awaiting-allocation.patch
mm-slub-change-run-time-assertion-in-kmalloc_index-to-compile-time-fix.patch
printk-introduce-dump_stack_lvl-fix.patch
kfence-unconditionally-use-unbound-work-queue.patch
kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures.patch
kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures-v2.patch
