linux-kernel - Re: [PATCH v2 5/6] x86/xen: Add a Xen-specific sync

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Message-ID: <CA+55aFydg4RDv8a-Wpf=TyzPN59kONcUdCkk1KcSNMW_2Uix_g@mail.gmail.com>
Date:   Fri, 2 Dec 2016 11:24:09 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Borislav Petkov <bp@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Peter Anvin <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Matthew Whitehead <tedheadster@...il.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH v2 5/6] x86/xen: Add a Xen-specific sync_core() implementation

On Fri, Dec 2, 2016 at 11:20 AM, Borislav Petkov <bp@...en8.de> wrote:
>
> Something like below?

The optimize-nops thing needs it too, I think.

Again, this will never matter in practice (even if somebody has a i486
s till, the prefetch window size is like 16 bytes or something), but
from a documentation standpoint it's good.

              Linus