4.9-stable review patch.  If anyone has any objections, please let me know.


From: Josh Poimboeuf <jpoim...@redhat.com>

commit 867ac9d737094e46a6c33213f16dd1ec9e8bd5d5 upstream.

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 <fengguang...@intel.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Fixes: 9cfffb116887 ("objtool: Skip all "unreachable instruction" warnings for 
gcov kernels")
Signed-off-by: Ingo Molnar <mi...@kernel.org>
[just Makefile.build as the other parts of this patch already applied - gregkh]
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 scripts/Makefile.build |    3 +++
 1 file changed, 3 insertions(+)

--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -253,6 +253,9 @@ objtool_args = check
 objtool_args += --no-fp
+objtool_args += --no-unreachable
 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file

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