linux-kernel - Re: - maps2-add-proc-pid-pagemap-interface-fix.patch removed from -mm tree

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Message-Id: <20070427143131.60d0afc1.akpm@linux-foundation.org>
Date:	Fri, 27 Apr 2007 14:31:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Alexey Dobriyan <adobriyan@...ru>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: - maps2-add-proc-pid-pagemap-interface-fix.patch removed from
 -mm tree

On Fri, 27 Apr 2007 15:41:55 -0500
Matt Mackall <mpm@...enic.com> wrote:

> > +	no+_mmap_sem();						\
> 
> Except for this bit.

You'll put gcc out of a job ;)

> Maybe put it in the same config bucket as might_sleep?

hm, could do.  might_sleep() is intertwined with preempt in complex ways,
but we did decouple that at the config level.  no_mmap_sem() will dtrt for
all preempt settings.

But I'll be keeping this as a -mm-only debug patch (which brings us up to
about thirty of 'em), so I think it's best to make it unconfigurable so we
get maximum coverage.

That's if it actually works.  I haven't tried running it yet, and I have a
feeling that running it might cause a big "doh" moment.  We'll see.
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