From: Michael Ellerman <mpe@ellerman.id.au>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@lists.ozlabs.org, Greg Kurz <gkurz@linux.vnet.ibm.com>
Subject: Re: [PATCH 2 1/4] powerpc: drop the ability to tweak SMT mode at boot time
Date: Tue, 09 Dec 2014 15:11:02 +1100 [thread overview]
Message-ID: <1418098262.527.1.camel@concordia> (raw)
In-Reply-To: <1417805565.334.15.camel@freescale.com>
On Fri, 2014-12-05 at 12:52 -0600, Scott Wood wrote:
> On Fri, 2014-12-05 at 16:14 +0100, Greg Kurz wrote:
> > The smt-enabled kernel parameter basically leaves unwanted cpus executing
> > in firmware or wherever they happen to be. The very same applies to the
> > ibm,smt-enabled DT property which is no more used by anything known. These
> > are hacks that shoudn't be used in a production environment.
> >
> > Quoting mpe, "there are better ways for firmware to disable SMT".
>
> Those "better ways" don't apply to Freescale chips, where the OS enables
> (or not) SMT without any interaction with firmware.
But how does it know there even are SMT threads? From the device tree? So
just don't present the threads in the device tree?
cheers
next prev parent reply other threads:[~2014-12-09 4:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-05 15:13 [PATCH 2 0/4] powerpc: don't mess with SMT at boot time Greg Kurz
2014-12-05 15:14 ` [PATCH 2 1/4] powerpc: drop the ability to tweak SMT mode " Greg Kurz
2014-12-05 18:52 ` Scott Wood
2014-12-08 8:23 ` Greg Kurz
2014-12-08 22:39 ` Scott Wood
2014-12-09 4:11 ` Michael Ellerman [this message]
2014-12-09 8:53 ` Greg Kurz
2014-12-09 21:04 ` Scott Wood
2014-12-09 23:56 ` Michael Ellerman
2014-12-10 0:14 ` Scott Wood
2014-12-10 2:14 ` Michael Ellerman
2014-12-10 23:50 ` Scott Wood
2014-12-12 5:19 ` Michael Ellerman
2014-12-05 15:14 ` [PATCH 2 2/4] powerpc: drop smt_enabled_at_boot Greg Kurz
2014-12-05 15:15 ` [PATCH 2 3/4] powerpc: drop smp_generic_cpu_bootable() Greg Kurz
2014-12-05 15:34 ` Greg Kurz
2014-12-05 15:15 ` [PATCH 2 4/4] powerpc: drop the cpu_bootable hook Greg Kurz
2014-12-05 15:42 ` [PATCH] " Greg Kurz
2014-12-12 5:22 ` [PATCH 2 0/4] powerpc: don't mess with SMT at boot time Michael Ellerman
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=1418098262.527.1.camel@concordia \
--to=mpe@ellerman.id.au \
--cc=gkurz@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=scottwood@freescale.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).