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Date:   Mon, 20 Jan 2020 09:37:43 -0600
From:   Josh Poimboeuf <jpoimboe@redhat.com>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: linux-next: Tree for Nov 15 (objtool)
Message-ID: <20200120153743.z6ws3jbgnsmsjvvx@treble>
References: <20191115190525.77efdf6c@canb.auug.org.au>
 <c49752fe-4b47-2329-2cb8-caad44803e3a@infradead.org>
 <20191115163830.g262y75w3sh535fm@treble>
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On Fri, Nov 15, 2019 at 10:38:30AM -0600, Josh Poimboeuf wrote:
> On Fri, Nov 15, 2019 at 08:02:30AM -0800, Randy Dunlap wrote:
> > On 11/15/19 12:05 AM, Stephen Rothwell wrote:
> > > Hi all,
> > > 
> > > Changes since 20191114:
> > > 
> > 
> > on x86_64:
> > 
> > already reported and Josh supplied a fix (yet unmerged),
> > but this is still around:
> > 
> > kernel/exit.o: warning: objtool: __x64_sys_exit_group()+0x14: unreachable instruction
> 
> My apologies, I have a growing backlog of objtool fixes which I hope to
> post next week.
> 
> > 
> > new AFAIK:
> > 
> > drivers/gpu/drm/bridge/cdns-dsi.o: warning: objtool: cdns_dsi_bridge_enable()+0x3e0: unreachable instruction
> > 
> > obj file for latter one is attached.
> 
> This seems fishy.  cdns_dsi_init_link() never returns, it always dies a
> with UD2.  I bet GCC decided that it always does a divide-by-zero, and
> so it forces a crash as a result.  Will try to dig deeper next week...

Hi Randy,

(Digging up old objtool threads...)

This is another one that it would be nice to recreate, so I can open a
GCC bug if needed.  If you can still recreate it, can you provide the
config file and GCC version?

-- 
Josh