linux-kernel - Re: [PATCH v3 1/6] x86/alternatives: Teach text_poke

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Message-ID: <20191008145423.GG14765@zn.tnic>
Date:   Tue, 8 Oct 2019 16:54:24 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mhiramat@...nel.org, bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com
Subject: Re: [PATCH v3 1/6] x86/alternatives: Teach text_poke_bp() to emulate
 instructions

On Tue, Oct 08, 2019 at 04:48:34PM +0200, Peter Zijlstra wrote:
> Can, but why? That's more lines for no raisin ;-)

Here's a raisin: I was looking at this and then all of a sudden went:
"W00t, why is this do_sync part of the loop at all? Do they belong
together? Nope."

If we're going to save on lines, we've lost long ago.

> Very first pass, we write INT3's everywhere.

Doh.

Thx.

-- 
Regards/Gruss,
    Boris.

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