From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EAA5C433E7 for ; Wed, 14 Oct 2020 11:52:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5756220848 for ; Wed, 14 Oct 2020 11:52:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388361AbgJNLwx (ORCPT ); Wed, 14 Oct 2020 07:52:53 -0400 Received: from mx2.suse.de ([195.135.220.15]:34488 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726822AbgJNLwx (ORCPT ); Wed, 14 Oct 2020 07:52:53 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D84F8B2C5; Wed, 14 Oct 2020 11:52:50 +0000 (UTC) Message-ID: <6740c49b73b11aaf1d74d216dc6e055e0a0ceac3.camel@suse.de> Subject: Re: [PATCH v2 2/5] of/address: Introduce of_dma_lower_bus_limit() From: Nicolas Saenz Julienne To: Rob Herring Cc: Catalin Marinas , Christoph Hellwig , Ard Biesheuvel , "linux-kernel@vger.kernel.org" , Frank Rowand , Robin Murphy , linux-arm-kernel , "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" , Jeremy Linton , Linux IOMMU , devicetree@vger.kernel.org Date: Wed, 14 Oct 2020 13:52:49 +0200 In-Reply-To: References: <20201010151235.20585-1-nsaenzjulienne@suse.de> <20201010151235.20585-3-nsaenzjulienne@suse.de> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-vz0cKOt+RK+2KVWDw/31" User-Agent: Evolution 3.36.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-vz0cKOt+RK+2KVWDw/31 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Rob, On Mon, 2020-10-12 at 10:25 -0500, Rob Herring wrote: > On Sat, Oct 10, 2020 at 10:12 AM Nicolas Saenz Julienne > wrote: > > The function provides the CPU physical address addressable by the most > > constrained bus in the system. It might be useful in order to > > dynamically set up memory zones during boot. > >=20 > > Signed-off-by: Nicolas Saenz Julienne > > --- > > drivers/of/address.c | 34 ++++++++++++++++++++++++++++++++++ > > include/linux/of.h | 7 +++++++ > > 2 files changed, 41 insertions(+) > >=20 > > diff --git a/drivers/of/address.c b/drivers/of/address.c > > index eb9ab4f1e80b..755e97b65096 100644 > > --- a/drivers/of/address.c > > +++ b/drivers/of/address.c > > @@ -1024,6 +1024,40 @@ int of_dma_get_range(struct device_node *np, con= st struct bus_dma_region **map) > > } > > #endif /* CONFIG_HAS_DMA */ > >=20 > > +/** > > + * of_dma_safe_phys_limit - Get system wide DMA safe address space > > + * > > + * Gets the CPU physical address limit for safe DMA addressing system = wide by > > + * searching for the most constraining dma-range. Otherwise it returns= ~0ULL. > > + */ > > +u64 __init of_dma_safe_phys_limit(void) > > +{ > > + struct device_node *np =3D NULL; > > + struct of_range_parser parser; > > + const __be32 *ranges =3D NULL; > > + u64 phys_dma_limit =3D ~0ULL; > > + struct of_range range; > > + int len; > > + > > + for_each_of_allnodes(np) { > > + dma_addr_t cpu_end =3D 0; > > + > > + ranges =3D of_get_property(np, "dma-ranges", &len); > > + if (!ranges || !len) > > + continue; > > + > > + of_dma_range_parser_init(&parser, np); > > + for_each_of_range(&parser, &range) > > + if (range.cpu_addr + range.size > cpu_end) > > + cpu_end =3D range.cpu_addr + range.size= ; >=20 > This doesn't work if you have more than one level of dma-ranges. The > address has to be translated first. It should be okay to do that on > the start or end address (if not, your DT is broken). for_each_of_range() calls of_pci_range_parser_one() which utimately populat= es range.cpu_addr with of_translate_dma_address() results. Isn't that good eno= ugh? > Please add/extend a unittest for this. Will do. Regards, Nicolas --=-vz0cKOt+RK+2KVWDw/31 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEErOkkGDHCg2EbPcGjlfZmHno8x/4FAl+G5pEACgkQlfZmHno8 x/6siQgAoJtPgILFxIVwe1du4om5+ODIO41w5bT0qTXAyu1TIhYAfHgvQA/+Yz7N SRt7jhByA0NZcZnJk0mS5yR1URMoWQRO7FIdCWcG8cWtyf1cyv2azQijCrJiuSCG JiaNo0MCEArAdh7B2TufniYLWxuQn5qSw4/xJLLDeYsjxCCvTHKv+rB/u7vPAXuN ZzqQs06B7AVWW7bsfplFbAp3gBnKcL/APODWtYFu5WlUgPBCdsto1qqWv5uMZXEd DHJY+bYOOgn3Z3kApceVpdhBBBFOkp3in6WdEoKtoBeLBAnDTBeXCqcE9cFLG2xJ NP+YRl6dlHSarIqQsqyAhi9qut5ZOQ== =XNec -----END PGP SIGNATURE----- --=-vz0cKOt+RK+2KVWDw/31-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEDB2C43457 for ; Wed, 14 Oct 2020 11:52:56 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3BA5B20878 for ; Wed, 14 Oct 2020 11:52:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3BA5B20878 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id A6CF487581; Wed, 14 Oct 2020 11:52:55 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cPvuuDp2wzj9; Wed, 14 Oct 2020 11:52:54 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id CFC0E86F54; Wed, 14 Oct 2020 11:52:54 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B11AFC07FF; Wed, 14 Oct 2020 11:52:54 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 6872AC0051 for ; Wed, 14 Oct 2020 11:52:53 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 4F6A587B6A for ; Wed, 14 Oct 2020 11:52:53 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zWl3jz16MR9B for ; Wed, 14 Oct 2020 11:52:52 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by hemlock.osuosl.org (Postfix) with ESMTPS id 6C96187B68 for ; Wed, 14 Oct 2020 11:52:52 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D84F8B2C5; Wed, 14 Oct 2020 11:52:50 +0000 (UTC) Message-ID: <6740c49b73b11aaf1d74d216dc6e055e0a0ceac3.camel@suse.de> Subject: Re: [PATCH v2 2/5] of/address: Introduce of_dma_lower_bus_limit() From: Nicolas Saenz Julienne To: Rob Herring Date: Wed, 14 Oct 2020 13:52:49 +0200 In-Reply-To: References: <20201010151235.20585-1-nsaenzjulienne@suse.de> <20201010151235.20585-3-nsaenzjulienne@suse.de> User-Agent: Evolution 3.36.5 MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, Frank Rowand , Catalin Marinas , "linux-kernel@vger.kernel.org" , Jeremy Linton , Ard Biesheuvel , Linux IOMMU , "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" , Robin Murphy , Christoph Hellwig , linux-arm-kernel X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============2311297639294153938==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============2311297639294153938== Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-vz0cKOt+RK+2KVWDw/31" --=-vz0cKOt+RK+2KVWDw/31 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Rob, On Mon, 2020-10-12 at 10:25 -0500, Rob Herring wrote: > On Sat, Oct 10, 2020 at 10:12 AM Nicolas Saenz Julienne > wrote: > > The function provides the CPU physical address addressable by the most > > constrained bus in the system. It might be useful in order to > > dynamically set up memory zones during boot. > >=20 > > Signed-off-by: Nicolas Saenz Julienne > > --- > > drivers/of/address.c | 34 ++++++++++++++++++++++++++++++++++ > > include/linux/of.h | 7 +++++++ > > 2 files changed, 41 insertions(+) > >=20 > > diff --git a/drivers/of/address.c b/drivers/of/address.c > > index eb9ab4f1e80b..755e97b65096 100644 > > --- a/drivers/of/address.c > > +++ b/drivers/of/address.c > > @@ -1024,6 +1024,40 @@ int of_dma_get_range(struct device_node *np, con= st struct bus_dma_region **map) > > } > > #endif /* CONFIG_HAS_DMA */ > >=20 > > +/** > > + * of_dma_safe_phys_limit - Get system wide DMA safe address space > > + * > > + * Gets the CPU physical address limit for safe DMA addressing system = wide by > > + * searching for the most constraining dma-range. Otherwise it returns= ~0ULL. > > + */ > > +u64 __init of_dma_safe_phys_limit(void) > > +{ > > + struct device_node *np =3D NULL; > > + struct of_range_parser parser; > > + const __be32 *ranges =3D NULL; > > + u64 phys_dma_limit =3D ~0ULL; > > + struct of_range range; > > + int len; > > + > > + for_each_of_allnodes(np) { > > + dma_addr_t cpu_end =3D 0; > > + > > + ranges =3D of_get_property(np, "dma-ranges", &len); > > + if (!ranges || !len) > > + continue; > > + > > + of_dma_range_parser_init(&parser, np); > > + for_each_of_range(&parser, &range) > > + if (range.cpu_addr + range.size > cpu_end) > > + cpu_end =3D range.cpu_addr + range.size= ; >=20 > This doesn't work if you have more than one level of dma-ranges. The > address has to be translated first. It should be okay to do that on > the start or end address (if not, your DT is broken). for_each_of_range() calls of_pci_range_parser_one() which utimately populat= es range.cpu_addr with of_translate_dma_address() results. Isn't that good eno= ugh? > Please add/extend a unittest for this. Will do. Regards, Nicolas --=-vz0cKOt+RK+2KVWDw/31 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEErOkkGDHCg2EbPcGjlfZmHno8x/4FAl+G5pEACgkQlfZmHno8 x/6siQgAoJtPgILFxIVwe1du4om5+ODIO41w5bT0qTXAyu1TIhYAfHgvQA/+Yz7N SRt7jhByA0NZcZnJk0mS5yR1URMoWQRO7FIdCWcG8cWtyf1cyv2azQijCrJiuSCG JiaNo0MCEArAdh7B2TufniYLWxuQn5qSw4/xJLLDeYsjxCCvTHKv+rB/u7vPAXuN ZzqQs06B7AVWW7bsfplFbAp3gBnKcL/APODWtYFu5WlUgPBCdsto1qqWv5uMZXEd DHJY+bYOOgn3Z3kApceVpdhBBBFOkp3in6WdEoKtoBeLBAnDTBeXCqcE9cFLG2xJ NP+YRl6dlHSarIqQsqyAhi9qut5ZOQ== =XNec -----END PGP SIGNATURE----- --=-vz0cKOt+RK+2KVWDw/31-- --===============2311297639294153938== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu --===============2311297639294153938==-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9181C433DF for ; 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bh=/MQZdUppIKObigtf3lIPAY3eoZu2AsV/kbphek23/To=; b=AIHLb2A2cIMzdTW+3ZgVt/vMI 5v7Y1Izx/Yix7WuPcKcdjrZUTbKvtSkqpkwBXrhRJrgGX/ec0iwLYBIDa44p8aH+V8JZKagGIS9o0 LQWP5UYGHYB65FfKo1a+Lu/QXVDApcXU2qMYIkDluZaBpVfKTn/UHAWDlojyBfYSTaHozq7Tad8Cg DRKpYi/K3mat/7FOs+1atwNnlkXH/Qb+5lJXcivG43eTLoVmnCDDioLd729XHWjNcidFJFUhd3ucd hC0S7sO5GaGwxinlz3vQqJxfn+oIaGf7hWG7DLUD+aVRzvl1mm+WDerPrFtX5tsD7JSKJZAHoZtBW sGRFFI1Fg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kSfKx-0001GO-2J; Wed, 14 Oct 2020 11:52:55 +0000 Received: from mx2.suse.de ([195.135.220.15]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kSfKu-0001Fx-4u; Wed, 14 Oct 2020 11:52:53 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D84F8B2C5; Wed, 14 Oct 2020 11:52:50 +0000 (UTC) Message-ID: <6740c49b73b11aaf1d74d216dc6e055e0a0ceac3.camel@suse.de> Subject: Re: [PATCH v2 2/5] of/address: Introduce of_dma_lower_bus_limit() From: Nicolas Saenz Julienne To: Rob Herring Date: Wed, 14 Oct 2020 13:52:49 +0200 In-Reply-To: References: <20201010151235.20585-1-nsaenzjulienne@suse.de> <20201010151235.20585-3-nsaenzjulienne@suse.de> User-Agent: Evolution 3.36.5 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201014_075252_422769_3B75D67C X-CRM114-Status: GOOD ( 25.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Frank Rowand , Catalin Marinas , "linux-kernel@vger.kernel.org" , Jeremy Linton , Ard Biesheuvel , Linux IOMMU , "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" , Robin Murphy , Christoph Hellwig , linux-arm-kernel Content-Type: multipart/mixed; boundary="===============1514582724210998164==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============1514582724210998164== Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-vz0cKOt+RK+2KVWDw/31" --=-vz0cKOt+RK+2KVWDw/31 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Rob, On Mon, 2020-10-12 at 10:25 -0500, Rob Herring wrote: > On Sat, Oct 10, 2020 at 10:12 AM Nicolas Saenz Julienne > wrote: > > The function provides the CPU physical address addressable by the most > > constrained bus in the system. It might be useful in order to > > dynamically set up memory zones during boot. > >=20 > > Signed-off-by: Nicolas Saenz Julienne > > --- > > drivers/of/address.c | 34 ++++++++++++++++++++++++++++++++++ > > include/linux/of.h | 7 +++++++ > > 2 files changed, 41 insertions(+) > >=20 > > diff --git a/drivers/of/address.c b/drivers/of/address.c > > index eb9ab4f1e80b..755e97b65096 100644 > > --- a/drivers/of/address.c > > +++ b/drivers/of/address.c > > @@ -1024,6 +1024,40 @@ int of_dma_get_range(struct device_node *np, con= st struct bus_dma_region **map) > > } > > #endif /* CONFIG_HAS_DMA */ > >=20 > > +/** > > + * of_dma_safe_phys_limit - Get system wide DMA safe address space > > + * > > + * Gets the CPU physical address limit for safe DMA addressing system = wide by > > + * searching for the most constraining dma-range. Otherwise it returns= ~0ULL. > > + */ > > +u64 __init of_dma_safe_phys_limit(void) > > +{ > > + struct device_node *np =3D NULL; > > + struct of_range_parser parser; > > + const __be32 *ranges =3D NULL; > > + u64 phys_dma_limit =3D ~0ULL; > > + struct of_range range; > > + int len; > > + > > + for_each_of_allnodes(np) { > > + dma_addr_t cpu_end =3D 0; > > + > > + ranges =3D of_get_property(np, "dma-ranges", &len); > > + if (!ranges || !len) > > + continue; > > + > > + of_dma_range_parser_init(&parser, np); > > + for_each_of_range(&parser, &range) > > + if (range.cpu_addr + range.size > cpu_end) > > + cpu_end =3D range.cpu_addr + range.size= ; >=20 > This doesn't work if you have more than one level of dma-ranges. The > address has to be translated first. It should be okay to do that on > the start or end address (if not, your DT is broken). for_each_of_range() calls of_pci_range_parser_one() which utimately populat= es range.cpu_addr with of_translate_dma_address() results. Isn't that good eno= ugh? > Please add/extend a unittest for this. Will do. Regards, Nicolas --=-vz0cKOt+RK+2KVWDw/31 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEErOkkGDHCg2EbPcGjlfZmHno8x/4FAl+G5pEACgkQlfZmHno8 x/6siQgAoJtPgILFxIVwe1du4om5+ODIO41w5bT0qTXAyu1TIhYAfHgvQA/+Yz7N SRt7jhByA0NZcZnJk0mS5yR1URMoWQRO7FIdCWcG8cWtyf1cyv2azQijCrJiuSCG JiaNo0MCEArAdh7B2TufniYLWxuQn5qSw4/xJLLDeYsjxCCvTHKv+rB/u7vPAXuN ZzqQs06B7AVWW7bsfplFbAp3gBnKcL/APODWtYFu5WlUgPBCdsto1qqWv5uMZXEd DHJY+bYOOgn3Z3kApceVpdhBBBFOkp3in6WdEoKtoBeLBAnDTBeXCqcE9cFLG2xJ NP+YRl6dlHSarIqQsqyAhi9qut5ZOQ== =XNec -----END PGP SIGNATURE----- --=-vz0cKOt+RK+2KVWDw/31-- --===============1514582724210998164== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============1514582724210998164==--