From 867ac9d737094e46a6c33213f16dd1ec9e8bd5d5 Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Mon, 24 Jul 2017 18:34:14 -0500 Subject: objtool: Fix gcov check for older versions of GCC Objtool tries to silence 'unreachable instruction' warnings when it detects gcov is enabled, because gcov produces a lot of unreachable instructions and they don't really matter. However, the 0-day bot is still reporting some unreachable instruction warnings with CONFIG_GCOV_KERNEL=y on GCC 4.6.4. As it turns out, objtool's gcov detection doesn't work with older versions of GCC because they don't create a bunch of symbols with the 'gcov.' prefix like newer versions of GCC do. Move the gcov check out of objtool and instead just create a new '--no-unreachable' flag which can be passed in by the kernel Makefile when CONFIG_GCOV_KERNEL is defined. Also rename the 'nofp' variable to 'no_fp' for consistency with the new 'no_unreachable' variable. Reported-by: kbuild test robot Signed-off-by: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: 9cfffb116887 ("objtool: Skip all "unreachable instruction" warnings for gcov kernels") Link: http://lkml.kernel.org/r/c243dc78eb2ffdabb6e927844dea39b6033cd395.1500939244.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- tools/objtool/check.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'tools/objtool/check.h') diff --git a/tools/objtool/check.h b/tools/objtool/check.h index ac3d4b13f17b..c9af11f0c8af 100644 --- a/tools/objtool/check.h +++ b/tools/objtool/check.h @@ -61,7 +61,7 @@ struct objtool_file { bool ignore_unreachables, c_file, hints; }; -int check(const char *objname, bool nofp, bool orc); +int check(const char *objname, bool no_fp, bool no_unreachable, bool orc); struct instruction *find_insn(struct objtool_file *file, struct section *sec, unsigned long offset); -- cgit v1.2.3