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Message-ID: <1318245101-16890-1-git-send-email-ian.campbell@citrix.com>
Date: Mon, 10 Oct 2011 12:11:33 +0100
From: Ian Campbell <ian.campbell@...rix.com>
To: netdev@...r.kernel.org
CC: Ian Campbell <ian.campbell@...rix.com>, linux-mm@...ck.org
Subject: [PATCH 1/9] mm: add a "struct subpage" type containing a page, offset and length
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 <ian.campbell@...rix.com>
Cc: linux-mm@...ck.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
--
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