From: nico@fluxnic.net (Nicolas Pitre)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/3] ARM: nommu: allow unaligned accesses on ARMv6+ processors
Date: Mon, 03 Dec 2012 14:25:22 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.02.1212031424430.6589@xanadu.home> (raw)
In-Reply-To: <1354557403-20386-1-git-send-email-will.deacon@arm.com>
On Mon, 3 Dec 2012, Will Deacon wrote:
> Commit 8428e84d ("ARM: 7150/1: Allow kernel unaligned accesses on ARMv6+
> processors") unconditionally clears SCTLR.A for ARMv6+ processors, since
> newer toolchains assume that unaligned memory accesses will not fault
> for these cores.
>
> This patch adds the corresponding change for nommu kernel builds.
>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
> ---
>
> Identical to Armando's recent patch but included here for completeness.
For patches 1 to 3:
Acked-by: Nicolas Pitre <nico@linaro.org>
>
> arch/arm/kernel/head-nommu.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
> index 278cfc1..2c228a0 100644
> --- a/arch/arm/kernel/head-nommu.S
> +++ b/arch/arm/kernel/head-nommu.S
> @@ -68,7 +68,7 @@ __after_proc_init:
> * CP15 system control register value returned in r0 from
> * the CPU init function.
> */
> -#ifdef CONFIG_ALIGNMENT_TRAP
> +#if defined(CONFIG_ALIGNMENT_TRAP) && __LINUX_ARM_ARCH__ < 6
> orr r0, r0, #CR_A
> #else
> bic r0, r0, #CR_A
> --
> 1.8.0
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
prev parent reply other threads:[~2012-12-03 19:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-03 17:56 [PATCH 1/3] ARM: nommu: allow unaligned accesses on ARMv6+ processors Will Deacon
2012-12-03 17:56 ` [PATCH 2/3] ARM: nommu: prevent generation of kernel unaligned memory accesses Will Deacon
2012-12-03 18:55 ` Rob Herring
2012-12-03 19:27 ` Nicolas Pitre
2012-12-03 17:56 ` [PATCH 3/3] ARM: nommu: do not enable DCACHE_WORD_ACCESS when !CONFIG_MMU Will Deacon
2012-12-03 18:20 ` [PATCH 1/3] ARM: nommu: allow unaligned accesses on ARMv6+ processors Jonathan Austin
2012-12-03 19:25 ` Nicolas Pitre [this message]
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