linux-kernel - Re: [RFC Patch v1 45/55] ARC: unaligned access emulation

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Message-Id: <201211121400.13046.arnd@arndb.de>
Date:	Mon, 12 Nov 2012 14:00:12 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Vineet.Gupta1@...opsys.com
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [RFC Patch v1 45/55] ARC: unaligned access emulation

On Monday 12 November 2012, Vineet.Gupta1@...opsys.com wrote:
> +
> +config ARC_MISALIGN_ACCESS
> +       bool "Emulate unaligned memory access (userspace only)"
> +       default N
> +       help
> +         This enables misaligned 16 & 32 bit memory access from user space.
> +         Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
> +         potential bugs in code

parisc and ia64 both have the same feature, and they use sysctl to configure
it at run-time. Maybe you should pick one of the two sysctl implementations
and hook that up to your implementation as well.

	Arnd
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