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

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Message-ID: <20161202192844.elq2py3cxizjs2bx@pd.tnic>
Date:   Fri, 2 Dec 2016 20:28:44 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
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 02, 2016 at 11:24:09AM -0800, Linus Torvalds wrote:
> The optimize-nops thing needs it too, I think.

Ah, it is called only from apply_alternatives() but sure, it is safer
this way. Lemme do that and run it through the boxes to see whether
anything catches fire.

> 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.

Right.

Thanks.

-- 
Regards/Gruss,
    Boris.

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