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From: David Howells <dhowells@redhat.com>
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Subject: Re: [PATCH 1/4] LOG2: Implement a general integer log2 facility in the kernel [try #4]
Date: Tue, 10 Oct 2006 13:23:34 +0100
Message-ID: <5167.1160483014@redhat.com>
Sender: linux-arch-owner@vger.kernel.org
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Kyle Moffett <mrmacman_g4@mac.com>, Matthew Wilcox <matthew@wil.cx>, torvalds@osdl.org, akpm@osdl.org, sfr@canb.auug.org.au, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
List-ID: <linux-arch.vger.kernel.org>


Jan Engelhardt <jengelh@linux01.gwdg.de> wrote:

> Ouch ouch ouch. It should better be
>
> typedef uint32_t __u32;


Actually, if you want to guarantee the size of an integer variable with gcc,
you can do, for example, this:

	typedef int __attribute__((mode(SI))) siint;

which creates a 32-bit signed integer type called "siint".

The "mode" attribute is parameterised with one of the following values to
indicate the specific size of integer required:

	QI	8-bit
	HI	16-bit
	SI	32-bit
	DI	64-bit
	TI	128-bit

David