Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751832Ab3HBL7W (ORCPT ); Fri, 2 Aug 2013 07:59:22 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:51059 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751598Ab3HBL7O (ORCPT ); Fri, 2 Aug 2013 07:59:14 -0400 X-IronPort-AV: E=Sophos;i="4.89,800,1367971200"; d="scan'208";a="39021726" Date: Fri, 2 Aug 2013 12:59:00 +0100 From: Stefano Stabellini X-X-Sender: sstabellini@kaball.uk.xensource.com To: Konrad Rzeszutek Wilk CC: Stefano Stabellini , , , , , , Subject: Re: [PATCH RFC 1/8] arm: make SWIOTLB available In-Reply-To: <334c4fe7-e40c-489c-84db-9bb58c705d44@email.android.com> Message-ID: References: <1375292732-7627-1-git-send-email-stefano.stabellini@eu.citrix.com> <334c4fe7-e40c-489c-84db-9bb58c705d44@email.android.com> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1367 Lines: 39 On Wed, 31 Jul 2013, Konrad Rzeszutek Wilk wrote: > Stefano Stabellini wrote: > >Signed-off-by: Stefano Stabellini > >CC: will.deacon@arm.com > >CC: linux@arm.linux.org.uk > >--- > > arch/arm/Kconfig | 7 +++++++ > > arch/arm/include/asm/dma-mapping.h | 24 ++++++++++++++++++++++++ > > 2 files changed, 31 insertions(+), 0 deletions(-) > > > >diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > >index ba412e0..05125ab 100644 > >--- a/arch/arm/Kconfig > >+++ b/arch/arm/Kconfig > >@@ -1832,6 +1832,13 @@ config CC_STACKPROTECTOR > > neutralized via a kernel panic. > > This feature requires gcc version 4.2 or above. > > > >+config SWIOTLB > >+ def_bool y > >+ select NEED_SG_DMA_LENGTH > >+ > >+config IOMMU_HELPER > >+ def_bool SWIOTLB > >+ > > Could you explain the purpose of these two a bit more please? SWIOTLB is not available on arm at the moment. We need to make it available, otherwise SWIOTLB_XEN won't be able to select it. Similarly, IOMMU_HELPER is another lib Kconfig symbol needed by SWIOTLB to compile. -- 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/