From: Paul Mundt <lethal@linux-sh.org>
To: Mike Frysinger <vapier.adi@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Jie Zhang <jie@codesourcery.com>,
uclinux-dev@uclinux.org, David Howells <dhowells@redhat.com>,
David McCullough <davidm@snapgear.com>,
Greg Ungerer <gerg@uclinux.org>,
uclinux-dist-devel@blackfin.uclinux.org,
microblaze-uclinux@itee.uq.edu.au,
Michal Simek <monstr@monstr.eu>,
linux-m32r@ml.linux-m32r.org,
Hirokazu Takata <takata@linux-m32r.org>,
linux-kernel@vger.kernel.org,
Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: Re: [PATCH] FLAT: allow arches to declare a larger alignment than the slab
Date: Wed, 26 May 2010 16:33:34 +0900 [thread overview]
Message-ID: <20100526073334.GD26696@linux-sh.org> (raw)
In-Reply-To: <AANLkTimWuqtLtnrgA8SHa-XoN8YdHJhQ6F2BngmmKSrl@mail.gmail.com>
On Wed, May 26, 2010 at 03:23:02AM -0400, Mike Frysinger wrote:
> On Wed, May 26, 2010 at 02:59, Geert Uytterhoeven wrote:
> > From looking at <linux/flat.h>, it looks like the FLAT binary format
> > doesn't contain any
> > alignment information? So if I put __attribute__((aligned(4096))) in a
> > file, there's still
> > no guarantee it will actually be in memory at a 4Ki-aligned address?
>
> i believe that is correct. FLAT behavior today provides alignment of
> either sizeof(unsigned long) or ARCH_SLAB_MINALIGN.
>
> i imagine something like this would work today because everyone
> defines it to a constant:
> -#ifdef ARCH_SLAB_MINALIGN
> +#if defined(ARCH_SLAB_MINALIGN) && ARCH_SLAB_MINALIGN != 0
> but this would break if someone tried using gcc sizeof/alignof/etc...
alignof is used by SLUB/SLOB to set the ARCH_SLAB_MINALIGN value if the
architecture hasn't already specified one, so that wouldn't work.
next prev parent reply other threads:[~2010-05-26 7:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-25 19:24 [PATCH] FLAT: allow arches to declare a larger alignment than the slab Mike Frysinger
2010-05-25 19:50 ` Geert Uytterhoeven
2010-05-25 21:07 ` Paul Mundt
2010-05-25 23:17 ` Mike Frysinger
2010-05-26 2:23 ` Jie Zhang
2010-05-26 6:59 ` Geert Uytterhoeven
2010-05-26 7:23 ` Mike Frysinger
2010-05-26 7:33 ` Paul Mundt [this message]
2010-05-26 7:36 ` Mike Frysinger
2010-05-26 7:36 ` Mike Frysinger
2010-05-26 7:48 ` Paul Mundt
2010-05-26 8:01 ` Mike Frysinger
2010-05-26 7:24 ` Michal Simek
2010-05-26 8:45 ` [PATCH 1/2 v2] FLAT: split the stack & data alignments Mike Frysinger
2010-05-27 8:24 ` Michal Simek
2010-05-27 18:30 ` [Uclinux-dist-devel] " Mike Frysinger
2010-05-27 23:15 ` [microblaze-uclinux] " David McCullough
2010-05-28 4:57 ` Mike Frysinger
2010-05-28 6:05 ` Mike Frysinger
2010-05-28 6:23 ` David McCullough
2010-05-28 6:40 ` Greg Ungerer
2010-05-26 8:45 ` [PATCH 2/2 v2] FLAT: tweak default stack alignment Mike Frysinger
2010-05-28 6:24 ` David McCullough
2010-05-28 6:39 ` Greg Ungerer
2010-06-06 7:12 ` [PATCH v3] " Mike Frysinger
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