linux-kernel - Re: IBT related objtool warnings

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Message-ID: <aef4052eb8c87860d71a2648fbfb1dbd894c1531.camel@intel.com>
Date:   Thu, 7 Apr 2022 15:20:48 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "peterz@...radead.org" <peterz@...radead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Poimboe, Josh" <jpoimboe@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: IBT related objtool warnings

On Thu, 2022-04-07 at 08:49 +0200, Peter Zijlstra wrote:
> On Wed, Apr 06, 2022 at 10:43:33PM +0000, Edgecombe, Rick P wrote:
> > Hi,
> > 
> > After commit:
> > ed53a0d97192 x86/alternative: Use .ibt_endbr_seal to seal indirect
> > calls
> > 
> > I am getting objtool "unreachable instruction" warnings.
> > 
> > On one system with gcc 8.4.0:
> > vmlinux.o: warning: objtool: start_secondary()+0x10e: unreachable
> > instruction
> > 
> > On another with gcc 11.2.1:
> > vmlinux.o: warning: objtool: pvh_start_xen()+0x0: unreachable
> > instruction
> 
> Could you try with tip/x86/urgent ?

I get:
vmlinux.o: warning: objtool: start_secondary()+0x10d: unreachable
instruction