linux-kernel - Re: [PATCH] arm: kernel: add support for detecting armv8 cpu cache information

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Message-ID: <20181018085609.GI30658@n2100.armlinux.org.uk>
Date:   Thu, 18 Oct 2018 09:56:09 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Teng Fei Fan <tengfei@...eaurora.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sudeep.holla@....com, will.deacon@....com,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] arm: kernel: add support for detecting armv8 cpu cache
 information

On Thu, Oct 18, 2018 at 02:16:47PM +0800, Teng Fei Fan wrote:
> This patch adds support for cacheinfo on 32bit ARMv8 platform.
> Add support for detecting cpu cache information cpu cache information
> via sysfs for 32bit armv8 platform. And export to sysfs then userspace
> can get from /sys/devices/system/cpu/cpuX/cache.

You don't explain why this is needed.

We don't do this for previous 32-bit CPUs, so why should we do this
for ARMv8 running on a 32-bit kernel?

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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