linux-kernel - Re: linux-next: Tree for Apr 30 (objtool warnings)

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Message-ID: <20200501035644.i7woe5bpyxqwjpwh@treble>
Date:   Thu, 30 Apr 2020 22:56:44 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: linux-next: Tree for Apr 30 (objtool warnings)

On Thu, Apr 30, 2020 at 07:40:52AM -0700, Randy Dunlap wrote:
> On 4/30/20 7:31 AM, Randy Dunlap wrote:
> > On 4/30/20 12:40 AM, Stephen Rothwell wrote:
> >> Hi all,
> >>
> >> Changes since 20200429:
> >>
> > 
> > on x86_64:
> > 
> > kernel/exit.o: warning: objtool: __x64_sys_exit_group()+0x2e: unreachable instruction
> > kernel/cred.o: warning: objtool: copy_creds()+0x278: unreachable instruction
> > net/core/skbuff.o: warning: objtool: skb_push()+0x9e: unreachable instruction
> > 
> > 
> > Full randconfig file is attached.
> > 
> 
> oops, forgot to Cc: Josh and Peter.

These are all related to -flive-patching, for some reason it reduces
GCC's ability to detect local noreturn functions.  I had some patches
for these (and more) I'll need to dig up.

-- 
Josh