linux-kernel - Re: [PATCH 1/8] badpage: simplify page

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Date:	Tue, 2 Dec 2008 07:12:01 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Russ Anderson <rja@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Jones <davej@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/8] badpage: simplify page_alloc flag check+clear

On Tue, 2 Dec 2008, Hugh Dickins wrote:

> > But they are always clear on free. The checking is irrelevant.
>
> How about CHECK_PAGE_FLAGS_CLEAR_AT_FREE?

Strange name.

> The one I really disliked was "PAGE_FLAGS" for an obscure
> subset of page flags, and have got rid of that.

Good.

> > If (page->flags & (all the flags including dirty and SwapBacked))
> > 	zap-em.
>
> That's exactly what I did, isn't it?

Yes but you added another instance of this. Can you consolidate all the
check and clears into one?

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