linux-kernel - Re: Mark bitrevX() functions as const

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Message-ID: <17788.1165846950@redhat.com>
Date:	Mon, 11 Dec 2006 14:22:30 +0000
From:	David Howells <dhowells@...hat.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: Mark bitrevX() functions as const 

Akinobu Mita <akinobu.mita@...il.com> wrote:

> __attribute_pure__ ?

I'm not sure "pure" is better than const in this case.  Although it *does* look
at a global variable (byte_rev_table), that variable is constant.  In effect,
the functions output does only depend on its input.  The R/O data it requires
is no different to its out of line code.  You'd have to consult a compiler
wrangler to be sure, though.

David
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