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=-18.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 3FC41C432BE for ; Tue, 10 Aug 2021 18:25:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2125C60724 for ; Tue, 10 Aug 2021 18:25:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234525AbhHJSZw (ORCPT ); Tue, 10 Aug 2021 14:25:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:53690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241593AbhHJSZV (ORCPT ); Tue, 10 Aug 2021 14:25:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 159936056C; Tue, 10 Aug 2021 18:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628619899; bh=XbSvD674RGlSPfIxav1H631OYTL4qbTMztVKJu94RmE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DP2yJU21UM40aoq+olIUxsGijAPx/54KDW0L2HA9jcuB1s+ob8A/qEGqH/gcz4Rt/ k3iS9l6IciBEPaKctYkl2yetJYVe+XwpYQ1BEkg+dZ5tbX6r8tUUfbk057P2kSZtAR hZFuezBTIUpwZzyO6ItV0yJlvISdEuGVKBhNb3f373gCXm4U58DjStb+oJgC6hS6qI OTHGqyaPt5CtqkCgDXGYFqBpva3OaIKo3fwTPU1xbHaP16id6w77LpiO5fWvZchRN/ zoojfv8EZAOYTrNjppNhBoAbrnYL2DYTz7E6rEUMDJrXuCDaG5ffmuU4+WD89C3mMa j5cdq7t96Dxew== Date: Tue, 10 Aug 2021 19:24:54 +0100 From: Will Deacon To: Zhen Lei Cc: Robin Murphy , Joerg Roedel , linux-arm-kernel , iommu , linux-kernel Subject: Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync() Message-ID: <20210810182454.GB3296@willie-the-truck> References: <20210626110130.2416-1-thunder.leizhen@huawei.com> <20210626110130.2416-3-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210626110130.2416-3-thunder.leizhen@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jun 26, 2021 at 07:01:24PM +0800, Zhen Lei wrote: > The obvious key to the performance optimization of commit 587e6c10a7ce > ("iommu/arm-smmu-v3: Reduce contention during command-queue insertion") is > to allow multiple cores to insert commands in parallel after a brief mutex > contention. > > Obviously, inserting as many commands at a time as possible can reduce the > number of times the mutex contention participates, thereby improving the > overall performance. At least it reduces the number of calls to function > arm_smmu_cmdq_issue_cmdlist(). > > Therefore, function arm_smmu_cmdq_issue_cmd_with_sync() is added to insert > the 'cmd+sync' commands at a time. > > Signed-off-by: Zhen Lei > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++-------- > 1 file changed, 21 insertions(+), 12 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 2433d3c29b49ff2..a5361153ca1d6a4 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -858,11 +858,25 @@ static int arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, > return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, false); > } > > -static int arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > +static int __maybe_unused arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > { > return arm_smmu_cmdq_issue_cmdlist(smmu, NULL, 0, true); > } > > +static int arm_smmu_cmdq_issue_cmd_with_sync(struct arm_smmu_device *smmu, > + struct arm_smmu_cmdq_ent *ent) > +{ > + u64 cmd[CMDQ_ENT_DWORDS]; > + > + if (arm_smmu_cmdq_build_cmd(cmd, ent)) { > + dev_warn(smmu->dev, "ignoring unknown CMDQ opcode 0x%x\n", > + ent->opcode); > + return -EINVAL; > + } > + > + return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, true); > +} This function is almost identical to arm_smmu_cmdq_issue_cmd(). How about moving the guts out into a helper: static int __arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent, bool sync); and then having arm_smmu_cmdq_issue_cmd_with_sync() and arm_smmu_cmdq_issue_cmd() wrap that? Will 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=-15.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 B01C5C4338F for ; Tue, 10 Aug 2021 18:25:05 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (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 478E460724 for ; Tue, 10 Aug 2021 18:25:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 478E460724 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 1376B606B4; Tue, 10 Aug 2021 18:25:05 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LpXzXYR_jOEi; Tue, 10 Aug 2021 18:25:01 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp3.osuosl.org (Postfix) with ESMTPS id CAED6605D1; Tue, 10 Aug 2021 18:25:00 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B1B64C001A; Tue, 10 Aug 2021 18:25:00 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3B0F6C000E for ; Tue, 10 Aug 2021 18:25:00 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 1DA2381C71 for ; Tue, 10 Aug 2021 18:25:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp1.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=kernel.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R-05MYk0VuVp for ; Tue, 10 Aug 2021 18:24:59 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp1.osuosl.org (Postfix) with ESMTPS id 9CE1E81B84 for ; Tue, 10 Aug 2021 18:24:59 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 159936056C; Tue, 10 Aug 2021 18:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628619899; bh=XbSvD674RGlSPfIxav1H631OYTL4qbTMztVKJu94RmE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DP2yJU21UM40aoq+olIUxsGijAPx/54KDW0L2HA9jcuB1s+ob8A/qEGqH/gcz4Rt/ k3iS9l6IciBEPaKctYkl2yetJYVe+XwpYQ1BEkg+dZ5tbX6r8tUUfbk057P2kSZtAR hZFuezBTIUpwZzyO6ItV0yJlvISdEuGVKBhNb3f373gCXm4U58DjStb+oJgC6hS6qI OTHGqyaPt5CtqkCgDXGYFqBpva3OaIKo3fwTPU1xbHaP16id6w77LpiO5fWvZchRN/ zoojfv8EZAOYTrNjppNhBoAbrnYL2DYTz7E6rEUMDJrXuCDaG5ffmuU4+WD89C3mMa j5cdq7t96Dxew== Date: Tue, 10 Aug 2021 19:24:54 +0100 From: Will Deacon To: Zhen Lei Subject: Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync() Message-ID: <20210810182454.GB3296@willie-the-truck> References: <20210626110130.2416-1-thunder.leizhen@huawei.com> <20210626110130.2416-3-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210626110130.2416-3-thunder.leizhen@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) Cc: Robin Murphy , iommu , linux-arm-kernel , linux-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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Sat, Jun 26, 2021 at 07:01:24PM +0800, Zhen Lei wrote: > The obvious key to the performance optimization of commit 587e6c10a7ce > ("iommu/arm-smmu-v3: Reduce contention during command-queue insertion") is > to allow multiple cores to insert commands in parallel after a brief mutex > contention. > > Obviously, inserting as many commands at a time as possible can reduce the > number of times the mutex contention participates, thereby improving the > overall performance. At least it reduces the number of calls to function > arm_smmu_cmdq_issue_cmdlist(). > > Therefore, function arm_smmu_cmdq_issue_cmd_with_sync() is added to insert > the 'cmd+sync' commands at a time. > > Signed-off-by: Zhen Lei > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++-------- > 1 file changed, 21 insertions(+), 12 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 2433d3c29b49ff2..a5361153ca1d6a4 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -858,11 +858,25 @@ static int arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, > return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, false); > } > > -static int arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > +static int __maybe_unused arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > { > return arm_smmu_cmdq_issue_cmdlist(smmu, NULL, 0, true); > } > > +static int arm_smmu_cmdq_issue_cmd_with_sync(struct arm_smmu_device *smmu, > + struct arm_smmu_cmdq_ent *ent) > +{ > + u64 cmd[CMDQ_ENT_DWORDS]; > + > + if (arm_smmu_cmdq_build_cmd(cmd, ent)) { > + dev_warn(smmu->dev, "ignoring unknown CMDQ opcode 0x%x\n", > + ent->opcode); > + return -EINVAL; > + } > + > + return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, true); > +} This function is almost identical to arm_smmu_cmdq_issue_cmd(). How about moving the guts out into a helper: static int __arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent, bool sync); and then having arm_smmu_cmdq_issue_cmd_with_sync() and arm_smmu_cmdq_issue_cmd() wrap that? Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu 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=-16.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 6F190C4338F for ; Tue, 10 Aug 2021 18:27:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 25A2860231 for ; Tue, 10 Aug 2021 18:27:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 25A2860231 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=jzr7R6BnHIRXMd1tABMf9IFMThPdlhEsUEX9sICAPMg=; b=mvK4Vt7MCTnssg ELmQDnNnVvkIy/1CY6WNf13Z++7TMxGJyKmBAagKvjqbZNLYLyG5z8Am3SVhYa8ejt3PQMWQ5PcKM 2vmp6jXu0kPeKJLDHTpPSU80YFnZC+SaGekpwXZDJ6+WmxX61mkKXZTk5B+O7H22W5+5ApHFFzU25 yON75jcbll/y74kWwLyHZbbCtTTSP8raJCMe331bPRFTPNq824FI0QtrcHjR6NSxSGMulXN6ZLCaI ZwIVv5VXiKyM4eLWb6kNGTgo4A87W0EZrE3qfpLM7EUBkVs4msDenR3BOqKcVHSgJH7xJ48ahJmer jADjRCsaHnHBpfPVFeug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mDWQx-004iNb-KS; Tue, 10 Aug 2021 18:25:03 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mDWQt-004iMv-UI for linux-arm-kernel@lists.infradead.org; Tue, 10 Aug 2021 18:25:01 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 159936056C; Tue, 10 Aug 2021 18:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628619899; bh=XbSvD674RGlSPfIxav1H631OYTL4qbTMztVKJu94RmE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DP2yJU21UM40aoq+olIUxsGijAPx/54KDW0L2HA9jcuB1s+ob8A/qEGqH/gcz4Rt/ k3iS9l6IciBEPaKctYkl2yetJYVe+XwpYQ1BEkg+dZ5tbX6r8tUUfbk057P2kSZtAR hZFuezBTIUpwZzyO6ItV0yJlvISdEuGVKBhNb3f373gCXm4U58DjStb+oJgC6hS6qI OTHGqyaPt5CtqkCgDXGYFqBpva3OaIKo3fwTPU1xbHaP16id6w77LpiO5fWvZchRN/ zoojfv8EZAOYTrNjppNhBoAbrnYL2DYTz7E6rEUMDJrXuCDaG5ffmuU4+WD89C3mMa j5cdq7t96Dxew== Date: Tue, 10 Aug 2021 19:24:54 +0100 From: Will Deacon To: Zhen Lei Cc: Robin Murphy , Joerg Roedel , linux-arm-kernel , iommu , linux-kernel Subject: Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync() Message-ID: <20210810182454.GB3296@willie-the-truck> References: <20210626110130.2416-1-thunder.leizhen@huawei.com> <20210626110130.2416-3-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210626110130.2416-3-thunder.leizhen@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210810_112500_043035_023F4A84 X-CRM114-Status: GOOD ( 19.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Jun 26, 2021 at 07:01:24PM +0800, Zhen Lei wrote: > The obvious key to the performance optimization of commit 587e6c10a7ce > ("iommu/arm-smmu-v3: Reduce contention during command-queue insertion") is > to allow multiple cores to insert commands in parallel after a brief mutex > contention. > > Obviously, inserting as many commands at a time as possible can reduce the > number of times the mutex contention participates, thereby improving the > overall performance. At least it reduces the number of calls to function > arm_smmu_cmdq_issue_cmdlist(). > > Therefore, function arm_smmu_cmdq_issue_cmd_with_sync() is added to insert > the 'cmd+sync' commands at a time. > > Signed-off-by: Zhen Lei > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++-------- > 1 file changed, 21 insertions(+), 12 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 2433d3c29b49ff2..a5361153ca1d6a4 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -858,11 +858,25 @@ static int arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, > return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, false); > } > > -static int arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > +static int __maybe_unused arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) > { > return arm_smmu_cmdq_issue_cmdlist(smmu, NULL, 0, true); > } > > +static int arm_smmu_cmdq_issue_cmd_with_sync(struct arm_smmu_device *smmu, > + struct arm_smmu_cmdq_ent *ent) > +{ > + u64 cmd[CMDQ_ENT_DWORDS]; > + > + if (arm_smmu_cmdq_build_cmd(cmd, ent)) { > + dev_warn(smmu->dev, "ignoring unknown CMDQ opcode 0x%x\n", > + ent->opcode); > + return -EINVAL; > + } > + > + return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, true); > +} This function is almost identical to arm_smmu_cmdq_issue_cmd(). How about moving the guts out into a helper: static int __arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent, bool sync); and then having arm_smmu_cmdq_issue_cmd_with_sync() and arm_smmu_cmdq_issue_cmd() wrap that? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel