(reposting including LKML to catch other potential users)
Is this structure of any use to unify other instances of a similar
tuple, e.g. biovec, pagefrag etc?
Ian.
On Mon, 2011-10-10 at 12:11 +0100, Ian Campbell wrote:
> 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@xxxxxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> ---
> 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;
>
> /*
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