linux-kernel - Re: [RFC][PATCH] A generic boolean

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Message-ID: <jezmekzdb5.fsf@sykes.suse.de>
Date:	Fri, 04 Aug 2006 18:16:30 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Jes Sorensen <jes@....com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Jeff Garzik <jeff@...zik.org>,
	ricknu-0@...dent.ltu.se, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: [RFC][PATCH] A generic boolean

Jes Sorensen <jes@....com> writes:

> We know that today long is the only one that differs and that
> m68k has horrible natural alignment rules for historical reasons, but
> besides that it's pretty sane.

Try determining the alignment of u64 on i386.  You will be surprised.

#include <stdio.h>

typedef long long u64;
struct u64_s { u64 x; } x;

int main ()
{
  printf ("%d\n", __alignof__ (u64));
  printf ("%d\n", __alignof__ (x));
  return 0;
}

Btw, the iptables compat code was broken due to this.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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