linux-kernel - Re: [PATCH 10/11] maps3: add /proc/kpagecount and /proc/kpageflags interfaces

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Message-Id: <1192496879.6118.157.camel@localhost>
Date:	Mon, 15 Oct 2007 18:07:59 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	David Rientjes <rientjes@...gle.com>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>
Subject: Re: [PATCH 10/11] maps3: add /proc/kpagecount and /proc/kpageflags
	interfaces

On Mon, 2007-10-15 at 19:58 -0500, Matt Mackall wrote:
> 
> > For the bits that we want to export, we could also add the unoptimized
> > access functions for any that don't already have them:
> > 
> > #define __ClearPageReserved(page)       __clear_bit(PG_reserved, &(page)->flags)
> 
> Confused. Why are we interested in clear? 

We're not.  I just grabbed a random line to show the non-atomic
accessors.  Any actual one we'd need to add would be:

#define __PageBuddy(page)         __test_bit(PG_buddy, &(page)->flags)

It looks like we don't have any of these non-atomic ones for plain
__PageFoo().  So, we'd have to add them for each one that we wanted.
Still not much work, and still satisfies the "grep test". :)

-- Dave

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