linux-kernel - Re: [PATCH 1/1] arm64: defconfig: Add Coresight as module

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Message-ID: <07d37df2-246e-70ea-4a9f-e33354d8864d@arm.com>
Date:   Thu, 22 Sep 2022 10:04:09 +0100
From:   James Clark <james.clark@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mark Brown <broonie@...nel.org>
Cc:     coresight@...ts.linaro.org, catalin.marinas@....com,
        linux-arm-kernel@...ts.infradead.org, suzuki.poulose@....com,
        mike.leach@...aro.org, leo.yan@...aro.org,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 1/1] arm64: defconfig: Add Coresight as module



On 21/09/2022 17:46, Mathieu Poirier wrote:
> On Wed, Sep 21, 2022 at 04:26:59PM +0100, Mark Brown wrote:
>> On Wed, Sep 21, 2022 at 03:05:35PM +0100, James Clark wrote:
>>
>>> +CONFIG_CORESIGHT_CTI=m
>>> +CONFIG_CORESIGHT_CTI_INTEGRATION_REGS=y
>>
> 
> I agree - integration registers should not be enabled by default.
> 
>> Do we want this turned on by default?  According to the
>> description it's a bit dangerous and it's exposed via sysfs
>> rather than debugfs.
> 
> 

Should I disable just CONFIG_CORESIGHT_CTI_INTEGRATION_REGS or
CONFIG_CORESIGHT_CTI as well? There are other writable registers exposed
via sysfs outside of these two options, so I wanted to check if it's
just the integration registers that are the issue.