linux-kernel - Re: [Patch 04/18] include/linux/logfs.h

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Message-ID: <20070604091245.GF14823@lazybastard.org>
Date:	Mon, 4 Jun 2007 11:12:45 +0200
From:	Jörn Engel <joern@...ybastard.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, akpm@...l.org,
	Sam Ravnborg <sam@...nborg.org>,
	John Stoffel <john@...ffel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jamie Lokier <jamie@...reable.org>,
	Artem Bityutskiy <dedekind@...radead.org>,
	CaT <cat@....com.au>, Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	David Weinehall <tao@....umu.se>, Willy Tarreau <w@....eu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Dongjun Shin <djshin90@...il.com>, Pavel Machek <pavel@....cz>,
	Bill Davidsen <davidsen@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Albert Cahalan <acahalan@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Roland Dreier <rdreier@...co.com>,
	Ondrej Zajicek <santiago@...reenet.org>,
	Ulisses Furquim <ulissesf@...il.com>
Subject: Re: [Patch 04/18] include/linux/logfs.h

On Sun, 3 June 2007 23:42:25 +0200, Arnd Bergmann wrote:
> On Sunday 03 June 2007, Jörn Engel wrote:
> > +struct logfs_je_spillout {
> > +       __be64  so_segment[0];
> > +}__packed;
> 
> All the on-disk data structures you define in this file have naturally
> aligned members, so the __packed attribute is not needed.

Amen.  It is purely paranoia and I don't even know who is out to get me.

> However, I think it causes gcc to generate larger and slower code
> on some architectures, because now it has to assume that the data
> structure itself has no more than byte alignment.
> 
> I'd simply remove all instances of __packed therefore. In order
> to verify that you got it right in all cases, build with
> '-Wpadded -Wpacked'.

Fine with me.  Will do.

Jörn

-- 
Ninety percent of everything is crap.
-- Sturgeon's Law
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