[PATCH 19/35] objtool: Skip static assert when KCOV/KASAN

[Peter Zijlstra]

They make an absolutely horrid mess of things.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 scripts/Makefile.build        |    9 +++++++++
 tools/objtool/builtin-check.c |    3 ++-
 tools/objtool/builtin.h       |    2 +-
 tools/objtool/check.c         |    3 +++
 4 files changed, 15 insertions(+), 2 deletions(-)

--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -274,6 +274,15 @@ ifneq ($(RETPOLINE_CFLAGS),)
   objtool_args += --retpoline
 endif
 endif
+ifdef CONFIG_KCOV
+  objtool_no_assert := 1
+endif
+ifdef CONFIG_KASAN
+  objtool_no_assert := 1
+endif
+ifdef objtool_no_assert
+  objtool_args += --no-static-assert
+endif
 
 
 ifdef CONFIG_MODVERSIONS
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -29,7 +29,7 @@
 #include "builtin.h"
 #include "check.h"
 
-bool no_fp, no_unreachable, retpoline;
+bool no_fp, no_unreachable, retpoline, no_assert;
 
 static const char * const check_usage[] = {
 	"objtool check [<options>] file.o",
@@ -40,6 +40,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
 	OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
 	OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
+	OPT_BOOLEAN('s', "no-static-assert", &no_assert, "Skip static branch validation"),
 	OPT_END(),
 };
 
--- a/tools/objtool/builtin.h
+++ b/tools/objtool/builtin.h
@@ -20,7 +20,7 @@
 #include <subcmd/parse-options.h>
 
 extern const struct option check_options[];
-extern bool no_fp, no_unreachable, retpoline;
+extern bool no_fp, no_unreachable, retpoline, no_assert;
 
 extern int cmd_check(int argc, const char **argv);
 extern int cmd_orc(int argc, const char **argv);
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1122,6 +1122,9 @@ static int assert_static_jumps(struct ob
 	struct rela *rela;
 	int i;
 
+	if (no_assert)
+		return 0;
+
 	sec = find_section_by_name(file->elf, ".discard.jump_assert");
 	if (!sec)
 		return 0;