linux-kernel - Re: [PATCH v4] kselftests/damon: add support for cases where debugfs cannot be read

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Date:   Mon, 27 Jun 2022 13:46:58 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     SeongJae Park <sj38.park@...il.com>
Cc:     SeongJae Park <sj@...nel.org>,
        Gautam <gautammenghani201@...il.com>, shuah@...nel.org,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v4] kselftests/damon: add support for cases where debugfs
 cannot be read

On 6/27/22 12:57 PM, SeongJae Park wrote:
> From: SeongJae Park <sj@...nel.org>
> 
> Hi Shuah,
> 
> On Mon, 27 Jun 2022 11:00:18 -0600 Shuah Khan <skhan@...uxfoundation.org> wrote:
> 
> [...]
>>>> --- a/tools/testing/selftests/damon/_chk_dependency.sh
>>>> +++ b/tools/testing/selftests/damon/_chk_dependency.sh
>>>> @@ -26,3 +26,13 @@ do
>>>>    		exit 1
>>>>    	fi
>>>>    done
>>>> +
>>>> +permission_error="Operation not permitted"
>>>> +for f in attrs target_ids monitor_on
>>>> +do
>>>> +	status=$( cat "$DBGFS/$f" 2>&1 )
>>>> +	if [ "${status#*$permission_error}" != "$status" ]; then
>>>> +		echo "Permission for reading $DBGFS/$f denied; maybe secureboot enabled?"
>>
>> btw - does this run as a regular user or does it need root privilege?
>> If so add a test for that and skip with a message.
> 
> It needs the root permission, and does the check at the beginning[1].
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/testing/selftests/damon/_chk_dependency.sh?h=v5.19-rc4#n9
> 
> 

Great. Thank you. I will pull this one in for linux-kselftest next
for Linux 5.20-rc1

thanks,
-- Shuah