Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751823AbaKIXUG (ORCPT ); Sun, 9 Nov 2014 18:20:06 -0500 Received: from down.free-electrons.com ([37.187.137.238]:39638 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751424AbaKIXUF (ORCPT ); Sun, 9 Nov 2014 18:20:05 -0500 Date: Mon, 10 Nov 2014 00:17:44 +0100 From: Maxime Ripard To: Jan Kiszka Cc: linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com, Linux Kernel Mailing List , Marc Zyngier Subject: Re: AMR: sun7i: CPU hotplug support? Message-ID: <20141109231744.GC2989@lukather> References: <545FC215.7010802@web.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Fr7jhMP26BSURKlp" Content-Disposition: inline In-Reply-To: <545FC215.7010802@web.de> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Fr7jhMP26BSURKlp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Jan, On Sun, Nov 09, 2014 at 08:35:49PM +0100, Jan Kiszka wrote: > did anyone already happen to look into enabling CPU hotplug for the > Allwinner A20 in upstream? I'm currently running the sunxi-next branch > on Banana Pi, and echo 0 > .../cpu1/online just hangs the system. The > old 3.4 LeMaker kernel works fine in this regard. I can try to look into > details and port things over, just want to avoid duplicate efforts. Having hotplug support would indeed be very welcome. However, it should be done in u-boot, through PSCI, and not in the kernel itself. As far as I'm aware, no one worked actively on it, beside some WIP commit from Marc a while ago: https://git.kernel.org/cgit/linux/kernel/git/maz/u-boot.git/commit/?h=3Dwip= /psci&id=3D45379c0f9cf812f0f62722f4015ec907fa5dc144 Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com --Fr7jhMP26BSURKlp Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUX/YYAAoJEBx+YmzsjxAgQFgQAL0vddwvTHKLu2ydzPl33tty l0a7Yxy6Do8EtdLmmJvKvgQ8+lQbPJ7CTVeez2l3/5pwvyi71WOyMZA6Rmv3EL7F TQn5iuab7lV6P+6kFSRmmeUpAvgfeaYsSqXfAdoFG0uaDXlLd6PzSQ5B0a3tQEe3 ZwoFkICBlFKOzPE1scfuc4cbJCcJzdk0Dmb3GtJ0RpOHo9vvD+zvpOcpsA+OfJy/ pxybeY4StWdn/EU+iLT6WEbN+IOXdxT7N/iNuMPkxwwWj7QnJFzOMg9Qo5CytlHI t8U3aBCa/YCMZ/TH/YaQw4BSA3fRwe5PO8/OSnQAZ2hx4n0TM7xvSxJScwRpdnXq j/GKrJKMChHFtSUiXjIwDlkNjC88ZCletP2ZFPa6W+eWpCHJTuBp0Nj/USNrTp+D /UrUTb2HqFC7oSjolEAKA7Dx9cWzFKL88pX0d68AQoTmBpx9S0PFKLrGt2FxE+wy A8hru+i/GjDTflEVrMv0UgEIpQywCWEjU7WOxYJ02Ac0fIJ4NSfBdTfcGbNBnVeo sSYDJbQjHKaJ5IUHnt340UM6p79Dd+3rqfgmd3RMgMq6KTcFsikrKGNqiqv54Zfb kprtZ7erWFn6OyhSEy8Zd/C8gHmcwecGeU6W24MK/CizgE3FJLtWq69Wd8en+CMk J3Ho/mYP5h/NTLsnC8vc =QXfn -----END PGP SIGNATURE----- --Fr7jhMP26BSURKlp-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/