From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 8551A6B0088 for ; Sat, 21 Feb 2009 11:27:10 -0500 (EST) Message-ID: <49A02A61.6060909@cs.helsinki.fi> Date: Sat, 21 Feb 2009 18:22:57 +0200 From: Pekka Enberg MIME-Version: 1.0 Subject: Re: [PATCH] kmemcheck: add hooks for page- and sg-dma-mappings References: <1235223364-2097-1-git-send-email-vegard.nossum@gmail.com> <1235223364-2097-4-git-send-email-vegard.nossum@gmail.com> In-Reply-To: <1235223364-2097-4-git-send-email-vegard.nossum@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Vegard Nossum Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ingo Molnar List-ID: Vegard Nossum wrote: > This is needed for page allocator support to prevent false positives > when accessing pages which are dma-mapped. > > Signed-off-by: Vegard Nossum > --- > arch/x86/include/asm/dma-mapping.h | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h > index 830bb0e..713a002 100644 > --- a/arch/x86/include/asm/dma-mapping.h > +++ b/arch/x86/include/asm/dma-mapping.h > @@ -117,7 +117,12 @@ dma_map_sg(struct device *hwdev, struct scatterlist *sg, > { > struct dma_mapping_ops *ops = get_dma_ops(hwdev); > > + struct scatterlist *s; > + int i; > + > BUG_ON(!valid_dma_direction(direction)); > + for_each_sg(sg, s, nents, i) > + kmemcheck_mark_initialized(sg_virt(s), s->length); > return ops->map_sg(hwdev, sg, nents, direction); > } > > @@ -215,6 +220,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, > struct dma_mapping_ops *ops = get_dma_ops(dev); > > BUG_ON(!valid_dma_direction(direction)); > + kmemcheck_mark_initialized(page_address(page) + offset, size); > return ops->map_single(dev, page_to_phys(page) + offset, > size, direction); > } What's with the new BUG_ON() calls here? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org