From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: [PATCH 1/9] mm: add a "struct subpage" type containing a page, offset and length Date: Mon, 10 Oct 2011 12:11:33 +0100 Message-ID: <1318245101-16890-1-git-send-email-ian.campbell@citrix.com> References: <1318245076.21903.408.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Ian Campbell , linux-mm@kvack.org To: netdev@vger.kernel.org Return-path: Received: from smtp02.citrix.com ([66.165.176.63]:44685 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753546Ab1JJLLo (ORCPT ); Mon, 10 Oct 2011 07:11:44 -0400 In-Reply-To: <1318245076.21903.408.camel@zakaz.uk.xensource.com> Sender: netdev-owner@vger.kernel.org List-ID: A few network drivers currently use skb_frag_struct for this purpose but I have patches which add additional fields and semantics there which these other uses do not want. A structure for reference sub-page regions seems like a generally useful thing so do so instead of adding a network subsystem specific structure. Signed-off-by: Ian Campbell Cc: linux-mm@kvack.org --- include/linux/mm_types.h | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 774b895..dc1d103 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -135,6 +135,17 @@ struct page { #endif ; +struct subpage { + struct page *page; +#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) + __u32 page_offset; + __u32 size; +#else + __u16 page_offset; + __u16 size; +#endif +}; + typedef unsigned long __nocast vm_flags_t; /* -- 1.7.2.5