Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU

Aubrey Li <[email protected]> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Follow-Ups:
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: "Aubrey Li" <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: David Howells <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: Eric Dumazet <[email protected]>

References:
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: "Aubrey Li" <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: Robin Getz <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: "Wu, Bryan" <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: David Howells <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: Robin Getz <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: "Aubrey Li" <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: David Howells <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: "Aubrey Li" <[email protected]>
- Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
  - From: David Howells <[email protected]>

Prev by Date: regression with gammu on 2.6.21-rc7
Next by Date: Re: [RFC 2/2] Input: phantom, add a new driver
Previous by thread: Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
Next by thread: Re: [PATCH] CONFIG_PACKET_MMAP should depend on MMU
Index(es):
- Date
- Thread

[Index of Archives] [Kernel Newbies] [Netfilter] [Bugtraq] [Photo] [Stuff] [Gimp] [Yosemite News] [MIPS Linux] [ARM Linux] [Linux Security] [Linux RAID] [Video 4 Linux] [Linux for the blind] [Linux Resources]