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From: Mike Frysinger <vapier.adi@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: uclinux-dev@uclinux.org, David Howells <dhowells@redhat.com>,
	David McCullough <davidm@snapgear.com>,
	Greg Ungerer <gerg@uclinux.org>, Paul Mundt <lethal@linux-sh.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>,
	Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: Re: [PATCH 1/2 v2] FLAT: split the stack & data alignments
Date: Fri, 28 May 2010 02:05:27 -0400	[thread overview]
Message-ID: <AANLkTilUCAoppSG7TIWyUqVa98ItoFHTh_lxA6Fl8l8g@mail.gmail.com> (raw)
In-Reply-To: <1274863506-14168-1-git-send-email-vapier@gentoo.org>

On Wed, May 26, 2010 at 04:45, Mike Frysinger wrote:
> The stack and data have different alignment requirements, so don't force
> them to wear the same shoe.  Increase the data alignment to match that
> which the elf2flt linker script has always been using: 0x20 bytes.  Not
> only does this bring the kernel loader in line with the toolchain, but
> it also fixes a swath of gcc tests which try to force larger alignment
> values but randomly fail when the FLAT loader fails to deliver.

btw, a follow up patch might be to move the shared lib identifiers
from the start of the data section to the end of it so that the
re-aligning isnt necessary (we'd get a 4k page alignment from mmap and
such).  but i cant seem to figure out how these identifiers are being
read/written.  otherwise, the fact that we're force aligning to 0x20
bytes means that there is always room for 8 identifiers ... no point
in flipping between 1 or 4, at least from this point of view ...
-mike

  parent reply	other threads:[~2010-05-28  6:06 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
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 [this message]
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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