From mboxrd@z Thu Jan 1 00:00:00 1970 From: pali.rohar@gmail.com (Pali =?utf-8?q?Roh=C3=A1r?=) Date: Wed, 18 Jun 2014 21:09:58 +0200 Subject: [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible In-Reply-To: <20140618190108.GI32514@n2100.arm.linux.org.uk> References: <1403110464-29646-1-git-send-email-pali.rohar@gmail.com> <20140618190108.GI32514@n2100.arm.linux.org.uk> Message-ID: <201406182109.59059@pali> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 18 June 2014 21:01:09 Russell King - ARM Linux wrote: > On Wed, Jun 18, 2014 at 06:54:24PM +0200, Pali Roh?r wrote: > > Machine name from board description is some generic name on > > DT kernel. DT provides machine name property which is > > specific for board, so use it instead generic one when > > possible. > > http://archive.arm.linux.org.uk/lurker/message/20130726.132850 > .53d47576.en.html > > "If userspace wants to get at the DT information about a > platform, we already have ways that can happen already - we > export the DT stuff so that kexec's tools can get at it." Userspace application does not know that kernel using DT. And also it does not want to get DT information. Only board/machine name. So existing applications stop working after migration to DT. And because legacy board boot code (without DT) is going to be removed for ARM in near future this will permanently break existing applications. And sometimes it is even not possible to fix userspace application if is closed source - binary only. -- Pali Roh?r pali.rohar at gmail.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754692AbaFRTKG (ORCPT ); Wed, 18 Jun 2014 15:10:06 -0400 Received: from mail-we0-f175.google.com ([74.125.82.175]:61804 "EHLO mail-we0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754389AbaFRTKC (ORCPT ); Wed, 18 Jun 2014 15:10:02 -0400 From: Pali =?utf-8?q?Roh=C3=A1r?= To: "Russell King - ARM Linux" Subject: Re: [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible Date: Wed, 18 Jun 2014 21:09:58 +0200 User-Agent: KMail/1.13.7 (Linux/3.15.0-031500-generic; KDE/4.13.0; x86_64; ; ) Cc: Santosh Shilimkar , Will Deacon , Ivaylo Dimitrov , Sebastian Reichel , Pavel Machek , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <1403110464-29646-1-git-send-email-pali.rohar@gmail.com> <20140618190108.GI32514@n2100.arm.linux.org.uk> In-Reply-To: <20140618190108.GI32514@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart26477218.tLSLmNidOV"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <201406182109.59059@pali> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nextPart26477218.tLSLmNidOV Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Wednesday 18 June 2014 21:01:09 Russell King - ARM Linux=20 wrote: > On Wed, Jun 18, 2014 at 06:54:24PM +0200, Pali Roh=C3=A1r wrote: > > Machine name from board description is some generic name on > > DT kernel. DT provides machine name property which is > > specific for board, so use it instead generic one when > > possible. >=20 > http://archive.arm.linux.org.uk/lurker/message/20130726.132850 > .53d47576.en.html >=20 > "If userspace wants to get at the DT information about a > platform, we already have ways that can happen already - we > export the DT stuff so that kexec's tools can get at it." Userspace application does not know that kernel using DT. And=20 also it does not want to get DT information. Only board/machine=20 name. So existing applications stop working after migration to=20 DT. And because legacy board boot code (without DT) is going to=20 be removed for ARM in near future this will permanently break=20 existing applications. And sometimes it is even not possible to fix userspace=20 application if is closed source - binary only. =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart26477218.tLSLmNidOV Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlOh5AcACgkQi/DJPQPkQ1LKZQCgu9SzeOwRnt2iq4jUkCxJtcQE C1IAnRPRpKiUNGmRvGHYtfVs6VidUBaQ =Ex1z -----END PGP SIGNATURE----- --nextPart26477218.tLSLmNidOV--