Subject: Re: ptrace and pfn mappings
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, Hugh Dickins <hugh@veritas.com>,
       Linux Memory Management <linux-mm@kvack.org>,
       Andrew Morton <akpm@osdl.org>, Jes Sorensen <jes@sgi.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
In-Reply-To: <20061010034606.GJ15822@wotan.suse.de>
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Date: Tue, 10 Oct 2006 14:58:15 +1000
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> Since we decided it would be better to make a new function or some arch
> specfic hooks rather than switch mm's in the kernel? ;)
> 
> No, I don't know. Your idea might be reasonable, but I really haven't
> thought about it much.

Another option is to take the PTE lock while doing the accesses for that
PFN... might work. We still need a temp kernel buffer but that would
sort-of do the trick.

Ben.


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