linux-kernel - Re: [PATCH] x86/hyperv: Mark hv_ghcb

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Date:   Fri, 10 Mar 2023 12:41:46 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     linux-hyperv@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, decui@...rosoft.com,
        haiyangz@...rosoft.com, kys@...rosoft.com, wei.liu@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        thomas.lendacky@....com, peterz@...radead.org,
        kernel-dev@...lia.com, kernel@...ccoli.net,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] x86/hyperv: Mark hv_ghcb_terminate() as noreturn

On 10/03/2023 12:24, Josh Poimboeuf wrote:
> On Fri, Mar 10, 2023 at 11:02:52AM -0300, Guilherme G. Piccoli wrote: 
> I'd recommend also adding it to the objtool global_noreturns list,
> otherwise this patch will probably trigger warnings with other non-IBT
> configs, in cases where the function is called from another translation
> unit, where GCC knows the function is noreturn but objtool doesn't.
> 
> We're looking at ways of eliminating global_noreturns, but it's
> unfortunately still a necessary evil at this point.
> 

Hi Josh, thanks! Makes sense, I'll respond here with a V2 doing that.


> Also, FWIW, I have a change coming soon which make these warnings much
> easier to diagnose.
> 

Cool =)