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

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Message-ID: <4BFC8617.9010501@codesourcery.com>
Date:	Wed, 26 May 2010 10:23:19 +0800
From:	Jie Zhang <jie@...esourcery.com>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	Paul Mundt <lethal@...ux-sh.org>,
	Mike Frysinger <vapier@...too.org>, uclinux-dev@...inux.org,
	David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.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>
Subject: Re: [PATCH] FLAT: allow arches to declare a larger alignment than
 the 	slab

On 05/26/2010 07:17 AM, Mike Frysinger wrote:
> i do not believe that is the reason for this, but unfortunately Jie is
> about the only one atm who knows the inner details as for why shared
> FLAT libraries requires 0x20 rather than just 0x4 alignment.  i do
> know that there are some gcc fortran tests that fail otherwise.
> hopefully he can remember details ;).
>
I encountered this issue when investigating some GCC test failures when 
using FLAT. I don't remember if they were in GCC Fortran testsuite. Some 
variables in those test cases were required to be aligned at a large 
boundary, for example 16-byte. I found 0x20 was a reasonably large 
alignment to fix all such failures in GCC testsuite.


Jie
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