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| author |   Ian Campbell <ian.campbell@citrix.com> | 2011-10-20 04:58:32 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-10-20 04:58:32 -0400 |
| commit | 30d3c128eafd2277ca2bb4b62845f25ad9295c12 (patch) | |
| tree | 18d0323ab3280f967fa294c0c6afc327573e2ed7 | |
| parent | mlx4_en: fix skb truesize underestimation (diff) | |
| download | linux-dev-30d3c128eafd2277ca2bb4b62845f25ad9295c12.tar.xz linux-dev-30d3c128eafd2277ca2bb4b62845f25ad9295c12.zip | |
mm: add a "struct page_frag" 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@citrix.com>
Acked-by: Jens Axboe <jaxboe@fusionio.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | 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 774b8952deb4..29971a589ff2 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -135,6 +135,17 @@ struct page { #endif ; +struct page_frag { + struct page *page; +#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) + __u32 offset; + __u32 size; +#else + __u16 offset; + __u16 size; +#endif +}; + typedef unsigned long __nocast vm_flags_t; /* |