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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>
This commit is contained in:
Eric Dumazet 2010-09-23 05:06:54 +00:00 committed by David S. Miller
parent c5256c5123
commit cb4dfe562c
1 changed files with 5 additions and 0 deletions
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include/linux/skbuff.h
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@ -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