linux-kernel - Re: [PATCH v2 10/11] x86/alternatives: Simplify ALTERNATIVE

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Message-ID: <20230913161444.GJ692@noisy.programming.kicks-ass.net>
Date:   Wed, 13 Sep 2023 18:14:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, David.Kaplan@....com,
        Andrew.Cooper3@...rix.com, jpoimboe@...nel.org,
        gregkh@...uxfoundation.org, nik.borisov@...e.com
Subject: Re: [PATCH v2 10/11] x86/alternatives: Simplify ALTERNATIVE_n()

On Wed, Sep 13, 2023 at 04:38:47PM +0200, Borislav Petkov wrote:
> On Wed, Sep 13, 2023 at 10:46:58AM +0200, Peter Zijlstra wrote:
> > We've gone over this multiple times already, also see commit
> > 6c480f222128. That made sure the kernel side adhered to this scheme by
> > making the tail a single instruction irrespective of the length.
> 
> Yes, sorry about that. I've been putting off digging deep into objtool
> internals for a while now and there are no more excuses so lemme finally
> read that whole thing and what it does in detail. And thanks for
> explaining again. :-\

No worries, I always seem to forget a detail or two myself :-)

> As to the patch at hand, how does the below look like?

Brain is fried, I'll give it a look tomorrow.