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

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Date:	Thu, 26 May 2011 15:29:34 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Nicolas Pitre <nico@...xnic.net>,
	Will Deacon <will.deacon@....com>,
	Måns Rullgård <mans@...sr.com>,
	Catalin Marinas <catalin.marinas@....com>,
	lkml <linux-kernel@...r.kernel.org>,
	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


> 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.

It won't, the arm gcc code just checks flag_conserve_stack.
IMHO it's just a gcc bug. You should report it to 
http://gcc.gnu.org/bugzilla

As a temporary workaround you can disable it in the kernel too, but as soon
as the compiler it's fixed I would recommend considering to reenable it.

-Andi

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