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net: Store virtual address instead of page in netdev_alloc_cache
This change makes it so that we store the virtual address of the page in the netdev_alloc_cache instead of the page pointer. The idea behind this is to avoid multiple calls to page_address since the virtual address is required for every access, but the page pointer is only needed at allocation or reset of the page. While I was at it I also reordered the netdev_alloc_cache structure a bit so that the size is always 16 bytes by dropping size in the case where PAGE_SIZE is greater than or equal to 32KB. Signed-off-by: Alexander Duyck <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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