Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU

[David Howells]

Aubrey Li <aubreylee@xxxxxxxxx> wrote:

> as checked in packet_set_ring, buffer size must be a multiple of PAGE_SIZE,
> --------------------packet_set_ring------------------------
> if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
> 
> So why not use __get_free_pages rather than kmalloc,

Because kmalloc() may be able to get us a smaller chunk of memory.  Actually,
calling __get_free_pages() might be a better, and then release the excess
pages.

> so that we have pagetables to count?

There are no pagetables in NOMMU-mode.

David
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