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In-Reply-To: <87wp8pol4u.fsf@firstfloor.org>
References: <cover.1496701658.git.luto@kernel.org> <d4eafd524ee51d003d7f7302d5e4e44dc4919e08.1496701658.git.luto@kernel.org>
 <87wp8pol4u.fsf@firstfloor.org>
From: Andy Lutomirski <luto@kernel.org>
Date: Tue, 13 Jun 2017 21:52:03 -0700
Message-ID: <CALCETrV-Wkqt89fJmjgK_BAdmzvXG8Vr1aTXDSnLRPO1NhwYYA@mail.gmail.com>
Subject: Re: [RFC 08/11] x86/mm: Add nopcid to turn off PCID
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Sender: owner-linux-mm@kvack.org
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To: Andi Kleen <andi@firstfloor.org>
Cc: Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>, Borislav Petkov <bpetkov@suse.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mgorman@suse.de>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Nadav Amit <nadav.amit@gmail.com>, Rik van Riel <riel@redhat.com>

On Mon, Jun 5, 2017 at 8:22 PM, Andi Kleen <andi@firstfloor.org> wrote:
> Andy Lutomirski <luto@kernel.org> writes:
>
>> The parameter is only present on x86_64 systems to save a few bytes,
>> as PCID is always disabled on x86_32.
>
> Seems redundant with clearcpuid.
>

It is.  OTOH, there are lots of noxyz options, and they're easier to
type and to remember.  Borislav?  Sometime I wonder whether we should
autogenerate noxyz options from the capflags table.

> -Andi

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