linux-kernel - Re: [PATCH] rdma/siw: Use proper enumerated type in map_cqe

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Date:   Tue, 27 Aug 2019 14:23:44 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Bernard Metzler <BMT@...ich.ibm.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] rdma/siw: Use proper enumerated type in map_cqe_status

On Tue, Aug 27, 2019 at 08:00:18PM +0300, Leon Romanovsky wrote:
> On Tue, Aug 27, 2019 at 10:08:30AM -0500, Josh Poimboeuf wrote:
> > On Mon, Aug 26, 2019 at 04:38:29PM -0700, Nathan Chancellor wrote:
> > > Looks like that comes from tune_qsfp, which gets inlined into
> > > tune_serdes but I am far from an objtool expert so I am not
> > > really sure what kind of issues I am looking for. Adding Josh
> > > and Peter for a little more visibility.
> > >
> > > Here is the original .o file as well:
> > >
> > > https://github.com/nathanchance/creduce-files/raw/4e252c0ca19742c90be1445e6c722a43ae561144/rdma-objtool/platform.o.orig
> >
> >      574:       0f 87 00 0c 00 00       ja     117a <tune_serdes+0xdfa>
> >
> > It's jumping to la-la-land past the end of the function.
> 
> How is it possible?

Looks like a compiler bug.

-- 
Josh