From: Brian Gerst <bgerst@didntduck.org>
To: Eric Barton <eric@bartonsoftware.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: kernel vaddr -> struct page
Date: Thu, 17 Oct 2002 15:24:49 -0400 [thread overview]
Message-ID: <3DAF0E81.4000101@didntduck.org> (raw)
In-Reply-To: 200210171911.g9HJBHk02456@bartonsoftware.com
Eric Barton wrote:
> 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?
>
virt_to_page()
--
Brian Gerst
next prev parent reply other threads:[~2002-10-17 19:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-17 19:11 kernel vaddr -> struct page Eric Barton
2002-10-17 19:24 ` Brian Gerst [this message]
2002-10-17 20:24 ` David S. Miller
2002-10-17 20:22 ` David S. Miller
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