linux-kernel - Re: [PATCH 4/4] ARM: kprobes: make more tests conditional

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Date:	Wed, 22 Aug 2012 10:42:40 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Russell King <rmk+kernel@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jon Medhurst <tixy@...t.co.uk>,
	Leif Lindholm <leif.lindholm@....com>
Subject: Re: [PATCH 4/4] ARM: kprobes: make more tests conditional

On Wed, 22 Aug 2012, Arnd Bergmann wrote:

> The mls instruction is not available in ARMv6K or below, so we
> should make the test conditional on at least ARMv7. ldrex/strex
> are available in ARMv6K or ARMv7, which we can test by checking
> the CONFIG_CPU_32v6K symbol. Just testing for ARMv6 is not enough.

The ldrex/strex instructions are available on ARMv6.  It's only the d 
variants (strexd/ldrexd) which are only available from ARMv6k.


Nicolas
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