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Date: Sat, 9 Feb 2002 15:14:15 +0100
From: Gerd Knorr <kraxel@bytesex.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@zip.com.au>, Andrea Arcangeli <andrea@suse.de>,
        Rik van Riel <riel@conectiva.com.br>,
        "David S. Miller" <davem@redhat.com>,
        Benjamin LaHaise <bcrl@redhat.com>,
        Marcelo Tosatti <marcelo@conectiva.com.br>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] __free_pages_ok oops
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> and Gerd Knorr's report (extracts below) implies that his bttv driver
> was calling unmap_kiobuf at interrupt time.  Is that right, Gerd?

Yes.

> encourage him to unmap at interrupt time).  Now maybe Gerd's code is
> wrong anyway: a quick look suggests it may also vfree there, which
> would be wrong at interrupt time.

vfree() isn't allowed?  I know vmalloc() isn't because it might sleep
while waiting for the VM getting a few free pages.  Why vfree isn't
allowed?  I can't see why freeing ressources is a problem ...

Is somewhere a list of things which are allowed from irq context and
which are not?

  Gerd

-- 
#define	ENOCLUE 125 /* userland programmer induced race condition */
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