linux-kernel - Re: [patch 3/3] mm: fault handler to replace nopage and populate

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Message-ID: <20061009120912.GE26824@wotan.suse.de>
Date:	Mon, 9 Oct 2006 14:09:12 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate

On Mon, Oct 09, 2006 at 01:58:36PM +0200, Nick Piggin wrote:
> > > > > > It also needs update_mmu_cache() I suppose.
> > > > > 
> > > > > Hmm, but it might not be called from a pagefault. Can we get away
> > > > > with not calling it? Or is it required by some architectures?
> > > > 
> > > > I think some architectures might be upset if it's not called...
> > > 
> > > But would any get upset if it is called from !pagefault path?
> > 
> > Probably not... the PTE has been filled so it should be safe, but then,
> > I don't know the details of what non-ppc archs do with that callback.

I guess we can make the rule that it only be called from the ->fault
handler anyway. If they want that functionality from ->mmap, then they
can use remap_pfn_range, because it isn't so performance critical.
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