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:	Tue, 19 Sep 2006 10:08:17 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...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] 

Andrew Morton <akpm@...l.org> wrote:

> This breaks ia64:

Okay, drop it for now.

> But for some reason putting ARCH_HAS_GET_ORDER into
> include/asm-ia64/bitops.h and including linux/log2.h in
> include/asm-ia64/page.h doesn't fix it.

Seems I need to get an IA64 cross-compiler.

> I didn't pursue it further, because sprinkling ARCH_HAS_FOO things into
> bitops.h(!) is all rather hacky.  Better to use CONFIG_* so they're always
> visible and one knows where to go to find things.

But (1) they're not config options, and (2) there's plenty of precedent for
this sort of thing (ARCH_HAS_PREFETCH for example).

David
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