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

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Date:	Mon, 11 Feb 2008 11:25:42 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andi Kleen <ak@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Jackson <pj@....com>,
	Christoph Lameter <clameter@....com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] mempolicy: convert MPOL constants to enum

On Mon, 11 Feb 2008, Andi Kleen 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.
> 
> What type checking? There is none in standard C for enums.
> 

"Type checking" probably isn't the best description for it.  As I 
mentioned in the changelog for the second patch in this series, a function 
with a formal type of 'enum mempolicy_mode' indicates that the optional 
mode flags have already been stripped off and the only possible values are 
those of 'enum mempolicy_mode'.  The implementation will not need to use 
mpol_mode() in conditionals or switch statements.  I think it's a clean 
way of describing what is acting on modes and what is acting on flags.

Functions with a formal type of an 'int' contain both the mode and flags.

		David
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