From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + videobuf-dma-contig-zero-copy-userptr-support-v3-comments.patch added to -mm tree Date: Tue, 12 May 2009 14:49:11 -0700 Message-ID: <200905122149.n4CLnBrx005519@imap1.linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:54304 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752738AbZELVwu (ORCPT ); Tue, 12 May 2009 17:52:50 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org Cc: damm@igel.co.jp, hannes@cmpxchg.org, hverkuil@xs4all.nl, lethal@linux-sh.org, mchehab@infradead.org The patch titled videobuf-dma-contig: zero copy USERPTR V3 comments has been added to the -mm tree. Its filename is videobuf-dma-contig-zero-copy-userptr-support-v3-comments.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: videobuf-dma-contig: zero copy USERPTR V3 comments From: Magnus Damm This patch adds function descriptions to V3 of the V4L2 videobuf-dma-contig USERPTR zero copy patch. Signed-off-by: Magnus Damm Cc: Johannes Weiner Cc: Paul Mundt Cc: Mauro Carvalho Chehab Cc: Hans Verkuil Signed-off-by: Andrew Morton --- drivers/media/video/videobuf-dma-contig.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff -puN drivers/media/video/videobuf-dma-contig.c~videobuf-dma-contig-zero-copy-userptr-support-v3-comments drivers/media/video/videobuf-dma-contig.c --- a/drivers/media/video/videobuf-dma-contig.c~videobuf-dma-contig-zero-copy-userptr-support-v3-comments +++ a/drivers/media/video/videobuf-dma-contig.c @@ -110,6 +110,12 @@ static struct vm_operations_struct video .close = videobuf_vm_close, }; +/** + * videobuf_dma_contig_user_put() - reset pointer to user space buffer + * @mem: per-buffer private videobuf-dma-contig data + * + * This function resets the user space pointer + */ static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem) { mem->is_userptr = 0; @@ -117,6 +123,16 @@ static void videobuf_dma_contig_user_put mem->size = 0; } +/** + * videobuf_dma_contig_user_get() - setup user space memory pointer + * @mem: per-buffer private videobuf-dma-contig data + * @vb: video buffer to map + * + * This function validates and sets up a pointer to user space memory. + * Only physically contiguous pfn-mapped memory is accepted. + * + * Returns 0 if successful. + */ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, struct videobuf_buffer *vb) { _ Patches currently in -mm which might be from damm@igel.co.jp are linux-next.patch videobuf-dma-contig-zero-copy-userptr-support-v3.patch videobuf-dma-contig-zero-copy-userptr-support-v3-comments.patch