linux-kernel - Re: [PATCH] FLAT: allow arches to declare a larger alignment than the slab

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Message-ID: <AANLkTimH-p5muib3-3sPWySFpQN7eLXf9KsCb_f0r9gw@mail.gmail.com>
Date:	Tue, 25 May 2010 21:50:34 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	uclinux-dev@...inux.org, David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	microblaze-uclinux@...e.uq.edu.au, Michal Simek <monstr@...str.eu>,
	linux-m32r@...linux-m32r.org,
	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-kernel@...r.kernel.org,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Jie Zhang <jie.zhang@...log.com>
Subject: Re: [PATCH] FLAT: allow arches to declare a larger alignment than the 
	slab

On Tue, May 25, 2010 at 21:24, Mike Frysinger <vapier@...too.org> wrote:
> From: Jie Zhang <jie.zhang@...log.com>
>
> The recent commit 1f0ce8b3dd667dca7 which moved the ARCH_SLAB_MINALIGN
> default into the global header inadvertently broke FLAT for a bunch of
> systems.  Blackfin systems now fail on any FLAT exec with:
> Unable to read code+data+bss, errno 14
> When your /init is a FLAT binary, obviously this can be annoying ;).
>
> This stems from the alignment usage in the FLAT loader.  The behavior
> before was that FLAT would default to ARCH_SLAB_MINALIGN only if it was
> defined, and this was only defined by arches when they wanted a larger
> alignment value.  Otherwise it'd default to pointer alignment.  Arguably,
                                             ^^^^^^^^^^^^^^^^^
That would be __alignof__(void *)

> +#elif defined(ARCH_SLAB_MINALIGN)
>  #define FLAT_DATA_ALIGN        (ARCH_SLAB_MINALIGN)
>  #else
>  #define FLAT_DATA_ALIGN        (sizeof(void *))

Not sizeof(void *)

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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