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| author |   Josh Poimboeuf <jpoimboe@redhat.com> | 2017-07-24 18:34:14 -0500 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-07-25 11:12:45 +0200 |
| commit | 867ac9d737094e46a6c33213f16dd1ec9e8bd5d5 (patch) | |
| tree | 708c868a63e86271f0572ea7120a406bfe7e88a1 /tools/objtool/builtin-orc.c | |
| parent | x86/io: Make readq() / writeq() API consistent (diff) | |
| download | linux-dev-867ac9d737094e46a6c33213f16dd1ec9e8bd5d5.tar.xz linux-dev-867ac9d737094e46a6c33213f16dd1ec9e8bd5d5.zip | |
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 <fengguang.wu@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 <mingo@kernel.org>
Diffstat (limited to 'tools/objtool/builtin-orc.c')
| -rw-r--r-- | tools/objtool/builtin-orc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c index 5ca41ab0df48..4c6b5c9ef073 100644 --- a/tools/objtool/builtin-orc.c +++ b/tools/objtool/builtin-orc.c @@ -37,7 +37,7 @@ static const char *orc_usage[] = { }; extern const struct option check_options[]; -extern bool nofp; +extern bool no_fp, no_unreachable; int cmd_orc(int argc, const char **argv) { @@ -51,7 +51,7 @@ int cmd_orc(int argc, const char **argv) objname = argv[0]; - return check(objname, nofp, true); + return check(objname, no_fp, no_unreachable, true); } |