linux-kernel - Re: [PATCHv3 0/3] Handle SETEND for AArch32 tasks

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Message-ID: <20150123171628.GG9557@e104818-lin.cambridge.arm.com>
Date:	Fri, 23 Jan 2015 17:16:29 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Suzuki Poulose <Suzuki.Poulose@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"leo.yan@...aro.org" <leo.yan@...aro.org>,
	"yexl@...vell.com" <yexl@...vell.com>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCHv3 0/3] Handle SETEND for AArch32 tasks

On Wed, Jan 21, 2015 at 12:43:08PM +0000, Suzuki K. Poulose wrote:
> From: "Suzuki K. Poulose" <suzuki.poulose@....com>
> 
> This series add support for controlling the 'setend' instruction,
> which is deprecated in ARMv8, using the legacy instruction emulation
> framework, introduced by Punit Agrawal.
> 
> Changes since V2:
>  - Move ID_AA64MMFR0_EL1 bit definitions to asm/cputype.h
>  - Use mask/value pair for the features in ID_AA64MMFR0_EL1
>  - Better documentation about the hardware support limitaion under
>    Documentation and the Kconfig help
>  - Restore the original 'set_hw_mode' API, with wrappers to invoke
>    the set_hw_mode for on_each_cpu() variants.
>  - Print a warning when we detect an incompatibility for a registered
>    insn_emulation hook on a hotplugged CPU.
> 
> Changes since V1:
>  - Added a patch to keep track of the mixed endian support and register
>    the setend emulation only if all the active CPUs supports mixed endian.
>  - Fail hotplug operation if the CPU doesn't support a feature
>    required by insn_emulation.
>  - Signal handler runs in native endian

I queued these patches for 3.20 (and included Punit's suggestion as
well). They should appear in linux-next later today.

Cc'ing Greg H @ Google since they are the main users of the emulation
code. If you see any problem, please let us know.

Thanks.

-- 
Catalin
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