linux-kernel - Re: [patch 1/4] mempolicy: convert MPOL constants to enum

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Date:	Mon, 11 Feb 2008 11:32:16 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Jackson <pj@....com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] mempolicy: convert MPOL constants to enum

On Mon, 11 Feb 2008, David Rientjes wrote:

> The mempolicy mode constants, MPOL_DEFAULT, MPOL_PREFERRED, MPOL_BIND,
> and MPOL_INTERLEAVE, are better declared as part of an enum for type
> checking.
> 
> The policy member of struct mempolicy is also converted from type short
> to type unsigned short.  A negative policy does not have any legitimate
> meaning, so it is possible to change its type in preparation for adding
> optional mode flags later.

The second paragraphs seems to indicate that such an approach does not 
work since we also use MPOL_xx constants to set flags in the memory 
policies?

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