linux-kernel - Re: [RFC][PATCH 6/6] objtool,x86: Rewrite retpoline thunk calls

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Date:   Fri, 19 Feb 2021 15:55:30 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, pjt@...gle.com, mbenes@...e.cz, jgross@...e.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 6/6] objtool,x86: Rewrite retpoline thunk calls

On Fri, Feb 19, 2021 at 09:43:06PM +0100, Peter Zijlstra wrote:
> Arguably it would be simpler to do the other way around, but
> unfortunately alternatives don't work that way, we cannot say:
> 
> 	ALTERNATIVE "call __x86_indirect_thunk_\reg",
> 		    "call *%reg", ~X86_FEATURE_RETPOLINE
> 
> That is, there is no negative form of alternatives.

X86_FEATURE_NO_RETPOLINE?

-- 
Josh