linux-kernel - Re: [patch 3/6] mempolicy: add MPOL_F_STATIC

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Date:	Tue, 26 Feb 2008 13:02:54 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Paul Jackson <pj@....com>
cc:	akpm@...ux-foundation.org, clameter@....com,
	Lee.Schermerhorn@...com, ak@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/6] mempolicy: add MPOL_F_STATIC_NODES flag

On Tue, 26 Feb 2008, Paul Jackson wrote:

> >         return do_mbind(start, len, mode, mode_flags, &nodes, flags);
> 
> The intermingling of 'flags', 'mode' and 'mode_flags' to refer to the
> low bits, the high bits or all the bits of the flags field is handled
> fairly carefully in your patch, but can still be a bit difficult to
> keep track of which is which when reading.
> 
> I'll wager not many readers can immediately say what the 'mode',
> 'mode_flags' and 'flags' refer to, in the above code snippet, for
> example.
> 
> Do you have any suggestions on how to further improve the clarity of
> this code?
> 

This is a natural implementation detail to accomodate your insistance that 
the mode and flags be passed as separate actuals throughout many of the 
mm/mempolicy.c functions.

No reader is going to understand immediately what 'mode', 'mode_flags', 
and 'flags' are if you only provide a single line of the code like that. 

It becomes rather obvious what they represent when you read the entire 
sys_mbind() implementation, which is serving a syscall that provides its 
own formal for passing flags.  The name 'mode_flags' is exactly what it 
is: flags for the mempolicy mode.

		David
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