From: Eric Barton <eric@bartonsoftware.com>
To: linux-kernel@vger.kernel.org
Subject: kernel vaddr -> struct page
Date: Thu, 17 Oct 2002 20:11:17 +0100 [thread overview]
Message-ID: <200210171911.g9HJBHk02456@bartonsoftware.com> (raw)
Hi,
I'm trying to turn a kernel virtual address into a struct page that I can
then pass to tcp_sendpage().
The kernel virtual address could be {kmalloc(),vmalloc(),kmap()}-ed memory,
and I guarantee that this memory will not be {kfree(),vfree(),kunmap()}-ed
until the socket has done with the page (i.e. all the data has been acked).
I'd have thought that vmalloc_to_page(kvaddr) should give me a page I could
use, since it is walking the page tables to find the pte for 'kvaddr', and
checking that the physical page is present.
However I find I'm sending garbage when I use this method.
Can anyone help me understand?
--
Cheers,
Eric
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----------------------------------------------------
next reply other threads:[~2002-10-17 19:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-17 19:11 Eric Barton [this message]
2002-10-17 19:24 ` kernel vaddr -> struct page Brian Gerst
2002-10-17 20:24 ` David S. Miller
2002-10-17 20:22 ` David S. Miller
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