+ kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch added to -mm tree

+ kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch added to -mm tree

[akpm]

The patch titled
     Subject: kcov: unconditionally add -fno-stack-protector to compiler options
has been added to the -mm tree.  Its filename is
     kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch

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------------------------------------------------------
From: Marco Elver <elver@google.com>
Subject: kcov: unconditionally add -fno-stack-protector to compiler options

Unconditionally add -fno-stack-protector to KCOV's compiler options, as
all supported compilers support the option.  This saves a compiler
invocation to determine if the option is supported.

Because Clang does not support -fno-conserve-stack, and
-fno-stack-protector was wrapped in the same cc-option, we were missing
-fno-stack-protector with Clang. Unconditionally adding this option
fixes this for Clang.

Link: http://lkml.kernel.org/r/20200615184302.7591-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/Makefile~kcov-unconditionally-add-fno-stack-protector-to-compiler-options
+++ a/kernel/Makefile
@@ -35,7 +35,7 @@ KCOV_INSTRUMENT_stacktrace.o := n
 KCOV_INSTRUMENT_kcov.o := n
 KASAN_SANITIZE_kcov.o := n
 KCSAN_SANITIZE_kcov.o := n
-CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
+CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector
 
 # cond_syscall is currently not LTO compatible
 CFLAGS_sys_ni.o = $(DISABLE_LTO)
_

Patches currently in -mm which might be from elver@google.com are

mm-kcsan-instrument-slab-slub-free-with-assert_exclusive_access.patch
kcov-unconditionally-add-fno-stack-protector-to-compiler-options.patch