linux-kernel - Re: [PATCH v2] coresight: trbe: Move check for kernel page table isolation from EL0 to probe

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Message-ID: <0c235c48-49b3-42ee-f65b-0043b599bcd3@arm.com>
Date:   Fri, 4 Feb 2022 12:02:13 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        coresight@...ts.linaro.org
Subject: Re: [PATCH v2] coresight: trbe: Move check for kernel page table
 isolation from EL0 to probe

On 03/02/2022 19:01, Sudeep Holla wrote:
> Currently with the check present in the module initialisation, it shouts
> on all the systems irrespective of presence of coresight trace buffer
> extensions.
> 
> Similar to Arm SPE perf driver, move the check for kernel page table
> isolation from  EL0 to the device probe stage instead of the module
> initialisation so that it complains only on the systems that support TRBE.
> 
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Mike Leach <mike.leach@...aro.org>
> Cc: Leo Yan <leo.yan@...aro.org>
> Cc: Anshuman Khandual <anshuman.khandual@....com>
> Cc: coresight@...ts.linaro.org
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Thanks, I have now queued this.

https://git.kernel.org/coresight/c/ebbce265bba164c4f0d5271c277a540bd3b2fd3c

Kind regards
Suzuki