linux-kernel - Re: IBT related objtool warnings

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Message-ID: <20220407064941.GH2731@worktop.programming.kicks-ass.net>
Date:   Thu, 7 Apr 2022 08:49:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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 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 ?