linux-kernel - Re: [PATCH] ARM: Do not allow unaligned accesses when CONFIG_ALIGNMENT

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Message-ID: <20110526215101.GL24876@n2100.arm.linux.org.uk>
Date:	Thu, 26 May 2011 22:51:01 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	Will Deacon <will.deacon@....com>,
	Måns Rullgård <mans@...sr.com>,
	Catalin Marinas <catalin.marinas@....com>,
	lkml <linux-kernel@...r.kernel.org>, ak@...ux.intel.com,
	Andrew Morton <akpm@...ux-foundation.org>, sam@...nborg.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: Do not allow unaligned accesses when
	CONFIG_ALIGNMENT_TRAP

On Thu, May 26, 2011 at 05:03:39PM -0400, Nicolas Pitre wrote:
> It is possible that -fconserve-stack is still valuable on ARM given that 
> it is also used with -mno-unaligned-access for other things than 
> structure packing on the stack, and therefore its merits can be debated 
> independently from the alignment issue at hand.

Catalin said in his mail "I haven't tried with -mno-unaligned-access, I
suspect the variables on the stack would be aligned.".  So I don't think
we know enough to say whether -mno-unaligned-access avoids the stack
packing.
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