From: "Stephen C. Tweedie" <sct@redhat.com>
To: Shuvabrata Ganguly <sganguly@cse.iitkgp.ernet.in>
Cc: linux MM <linux-mm@kvack.org>
Subject: Re: Question about pte_alloc()
Date: Wed, 15 Nov 2000 10:56:39 +0000 [thread overview]
Message-ID: <20001115105639.C3186@redhat.com> (raw)
In-Reply-To: <3A12363A.3B5395AF@cse.iitkgp.ernet.in>; from sganguly@cse.iitkgp.ernet.in on Wed, Nov 15, 2000 at 02:07:38AM -0500
Hi,
On Wed, Nov 15, 2000 at 02:07:38AM -0500, Shuvabrata Ganguly wrote:
>
> it appears from the code that pte_alloc() might block since it allocates
> a page table with GFP_KERNEL if the page table doesnt already exist. i
> need to call pte_alloc() at interrupt time.
You cannot safely play pte games at interrupt time. You _must_ do
this in the foreground.
>Basically i want to map some
> kernel memory into user space as soon as the device gives me data.
Why can't you just let the application know that the event has
occurred and then let it mmap the data itself?
Cheers,
Stephen
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next prev parent reply other threads:[~2000-11-15 10:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-15 7:07 Shuvabrata Ganguly
2000-11-14 20:51 ` Kanoj Sarcar
2000-11-15 10:56 ` Stephen C. Tweedie [this message]
2000-11-16 0:04 ` Shuvabrata Ganguly
2000-11-15 15:47 ` Stephen C. Tweedie
2000-11-16 20:32 ` Shuvabrata Ganguly
2000-11-16 14:37 ` Ingo Oeser
2000-11-15 15:20 Mark_H_Johnson
2000-11-15 15:34 ` Stephen C. Tweedie
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