LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "H. Peter Anvin" <hpa@zytor.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: Ingo Molnar <mingo@elte.hu>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org
Subject: Re: P6 NOPs again: MPSC?
Date: Tue, 11 Mar 2008 07:43:25 +0100	[thread overview]
Message-ID: <47D62A0D.3070107@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0803102142440.2464@blonde.site>

Hugh Dickins wrote:
> 
> Yup, I realized that (with || in place of &&): I meant that perhaps
> it was supposed to say X86_64 || (!X86_GENERIC && (M686 || ....))
> since quite a lot of other options there have "|| X86_64" to cover
> all the 64-bit possibilities at once i.e. is it only MPSC that
> needs to be added, or both MPSC and CPU_GENERIC?
> 

No.  The left-hand clause (X86_64 || !X86_GENERIC) indicates when using 
these NOPs are *permitted*; the right-hand clause indicates when doing 
so is *desirable*.  The latter isn't, for example, for K8, even on 64 bits.

	-hpa


  reply	other threads:[~2008-03-11  6:54 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-04 19:33 [PATCH] x86: a P4 is a P6 not an i486 Hugh Dickins
2008-03-04 21:01 ` Ingo Molnar
2008-03-04 21:24   ` H. Peter Anvin
2008-03-04 21:32     ` Ingo Molnar
2008-03-10 19:14     ` P6 NOPs again: MPSC? Hugh Dickins
2008-03-10 20:17       ` H. Peter Anvin
2008-03-10 22:02         ` Hugh Dickins
2008-03-11  6:43           ` H. Peter Anvin [this message]
2008-03-11 14:00             ` Hugh Dickins
2008-03-11  9:28           ` Ingo Molnar
2008-03-11 13:45             ` Hugh Dickins

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=47D62A0D.3070107@zytor.com \
    --to=hpa@zytor.com \
    --cc=akpm@linux-foundation.org \
    --cc=hugh@veritas.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --subject='Re: P6 NOPs again: MPSC?' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).