linux-kernel - Re: [PATCH -v3] flat: fix data sections alignment

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Date:	Thu, 9 Apr 2009 16:25:53 +0200
From:	Johannes Weiner <jw@...ix.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>, os@...ix.com,
	dhowells@...hat.com, rmk@....linux.org.uk, cooloney@...nel.org,
	geert@...ux-m68k.org, vapier.adi@...il.com, gerg@...inux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v3] flat: fix data sections alignment

On Thu, Apr 02, 2009 at 01:53:43PM -0700, Andrew Morton wrote:
> On Tue, 10 Mar 2009 16:33:50 +0900
> Paul Mundt <lethal@...ux-sh.org> wrote:
> 
> > On Thu, Mar 05, 2009 at 06:00:59PM +0100, Oskar Schirmer wrote:
> > > The flat loader uses an architecture's flat_stack_align() to align the
> > > stack but assumes word-alignment is enough for the data sections.
> > > 
> > > However, on the Xtensa S6000 we have registers up to 128bit width
> > > which can be used from userspace and therefor need userspace stack and
> > > data-section alignment of at least this size.
> > > 
> > > This patch drops flat_stack_align() and uses the same alignment that
> > > is required for slab caches, ARCH_SLAB_MINALIGN, or wordsize if it's
> > > not defined by the architecture.
> > > 
> > > It also fixes m32r which was obviously kaput, aligning an
> > > uninitialized stack entry instead of the stack pointer.
> > > 
> > > Signed-off-by: Oskar Schirmer <os@...ix.com>
> > > Signed-off-by: Johannes Weiner <jw@...ix.com>
> > > Cc: David Howells <dhowells@...hat.com>
> > > Cc: Russell King <rmk@....linux.org.uk>
> > > Cc: Bryan Wu <cooloney@...nel.org>
> > > Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> > > Cc: Paul Mundt <lethal@...ux-sh.org>
> > > Cc: Greg Ungerer <gerg@...inux.org>
> > > Cc: Mike Frysinger <vapier.adi@...il.com>
> > 
> > The updated version looks ok to me anyways, and it's certainly an
> > improvement over defining the same alignment requirements all over the
> > place.
> > 
> > Acked-by: Paul Mundt <lethal@...ux-sh.org>
> 
> Quite a few people expressed quite a few reservations over v2.
> 
> Are we all OK with a v3 merge?

Paul and Mike had complaints.  Paul acked the last revision.  Mike?
We need this for upstream to compile on our configuration.

	Hannes
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