linux-kernel - Re: [RFC] Improve memset

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Message-ID: <20190919124911.GA18148@nazgul.tnic>
Date:   Thu, 19 Sep 2019 14:49:11 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86-ml <x86@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Improve memset

On Tue, Sep 17, 2019 at 03:10:21PM -0500, Josh Poimboeuf wrote:
> Then the "reverse alternatives" feature wouldn't be needed anyway.

The intent was to have the default, most-used version be there at
build-time, obviating the need to patch. Therefore on those old !ERMS
CPUs we'll end up doing rep;stosb before patching, which is supported,
albeit slow.

-- 
Regards/Gruss,
    Boris.

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