From cb4dfe562cac6fcb544df752e40c1d78000d0712 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 23 Sep 2010 05:06:54 +0000
Subject: net: skb_frag_t can be smaller on small arches
On 32bit arches, if PAGE_SIZE is smaller than 65536, we can use 16bit
offset and size fields. This patch saves 72 bytes per skb on i386, or
128 bytes after rounding.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/skbuff.h | 5 +++++
1 file changed, 5 insertions(+)
(limited to 'include')
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b2c41d19735..0b53c43ac92 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -129,8 +129,13 @@ typedef struct skb_frag_struct skb_frag_t;
struct skb_frag_struct {
struct page *page;
+#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
__u32 page_offset;
__u32 size;
+#else
+ __u16 page_offset;
+ __u16 size;
+#endif
};
#define HAVE_HW_TIME_STAMP
--
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