linux-kernel - Re: [PATCH 5/7] Alter get_order() so that it can make use of ilog2() on a constant [try #3]

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Date:	Sun, 17 Sep 2006 20:04:51 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...l.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 5/7] Alter get_order() so that it can make use of
 ilog2() on a constant [try #3]

On Fri, 15 Sep 2006 15:42:42 +0100 David Howells <dhowells@...hat.com> wrote:
>
> Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> > Except the get_order() interface is purely related to pages (the fact
> > that you have reimplemented it using the log2-based functions is just an
> > implementation detail.
> 
> Do you have a major objection to it moving to linux/log2.h (do you count the
> one you've just raised as "major")?

I just think that things should be grouped according to the function they
provide (and not their implemetation) and get_order is part of the paging
API.

> I'd rather avoid including linux/log2.h or linux/kernel.h in asm/page.h, plus
> asm-generic/page.h isn't used by all archs (though that's a minor point).

You only have to include linux/log2.h in asm-generic/page.h.  Presumably
the architectures that don't use asm-generic/page.h won't want the new
implementation of get_order() either (I didn't keep the original patch).

Won't you need to include linux/log2.h in some places to get get_order(),
now?  And if I was needing the paging API, I am much more likely to look
for it in {linux,asm}/page.h than in linux/log2.h.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/
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