linux-kernel - Re: [RFC v5 12/57] objtool: check: Allow jumps from an alternative group to itself

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Message-ID: <20200121103016.GB11154@willie-the-truck>
Date:   Tue, 21 Jan 2020 10:30:16 +0000
From:   Will Deacon <will@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Julien Thierry <jthierry@...hat.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jpoimboe@...hat.com,
        raphael.gault@....com, catalin.marinas@....com
Subject: Re: [RFC v5 12/57] objtool: check: Allow jumps from an alternative
 group to itself

On Mon, Jan 20, 2020 at 03:56:56PM +0100, Peter Zijlstra wrote:
> On Thu, Jan 09, 2020 at 04:02:15PM +0000, Julien Thierry wrote:
> > Alternatives can contain instructions that jump to another instruction
> > in the same alternative group. This is actually a common pattern on
> > arm64.
> 
> LL/SC I bet...

I think there are some nasty errata workarounds that need it too.

WIll