As you recommended I do a __get_free_pages in the kernel and then from
user space I try and mmap the memory.
The mmap is successful but then when I go back and try and read from
that location I get a 'can't read of address 0xbf7c8000 (which is the
address the kernel gave me back).
???
:b!
Brian D. McGrew { [email protected] || [email protected] }
--
> This is a test. This is only a test!
Had this been an actual emergency, you would have been
told to cancel this test and seek professional assistance!
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of H. Peter Anvin
Sent: Tuesday, May 30, 2006 3:46 PM
To: [email protected]
Subject: Re: Sharing memory between kernel and user space
Followup to:
<14CFC56C96D8554AA0B8969DB825FEA0012B331A@chicken.machinevisionproducts.
com>
By author: "Brian D. McGrew" <[email protected]>
In newsgroup: linux.dev.kernel
>
> I have a question about the best way to share memory between user and
> kernel space.
>
In general, allocate the memory in kernel space (via get_free_page et
al), and make accessible to userspace via mmap on a device node.
-hpa
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