linux-kernel - Re: [PATCH 0/2] objtool: a couple of minor fixes

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Message-ID: <20161026123739.6ih5hkgs3stdumkn@treble>
Date:   Wed, 26 Oct 2016 07:37:39 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] objtool: a couple of minor fixes

On Wed, Oct 26, 2016 at 09:58:29AM +0200, Arnd Bergmann wrote:
> On Thursday, October 13, 2016 4:22:51 PM CEST Josh Poimboeuf wrote:
> > Fix a couple of issues:
> > 
> > - fix a false positive warning related to switch statement jump tables
> > - get rid of useless "unreachable instruction" warnings for gcov kernels
> > 
> > Josh Poimboeuf (2):
> >   objtool: improve rare switch jump table pattern detection
> >   objtool: skip all "unreachable instruction" warnings for gcov kernels
> > 
> >  tools/objtool/builtin-check.c | 68 ++++++++++++++++++++++---------------------
> >  1 file changed, 35 insertions(+), 33 deletions(-)
> 
> I got another warning today with linux-next, but have not looked into it:
> 
> drivers/infiniband/sw/rxe/rxe_comp.o: warning: objtool: rxe_completer()+0x315: sibling call from callable instruction with changed frame pointer
> 
> .config and object file attached.

I think this is the same as one of the warnings you reported before (for
which I opened the gcc bug):

  https://lkml.kernel.org/r/1855683.1QnG4Fe4Hq@wuerfel

-- 
Josh