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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id h6sm3077512ilr.24.2021.04.02.12.48.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Apr 2021 12:48:05 -0700 (PDT) Subject: Re: [PATCH v6 12/21] selftests/resctrl: Check for resctrl mount point only if resctrl FS is supported To: Fenghua Yu , Shuah Khan , Tony Luck , Reinette Chatre , Babu Moger , Ravi V Shankar , Shuah Khan Cc: linux-kselftest , linux-kernel References: <20210317022255.2536745-1-fenghua.yu@intel.com> <20210317022255.2536745-13-fenghua.yu@intel.com> From: Shuah Khan Message-ID: Date: Fri, 2 Apr 2021 13:48:04 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <20210317022255.2536745-13-fenghua.yu@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/16/21 8:22 PM, Fenghua Yu wrote: > check_resctrlfs_support() does the following > 1. Checks if the platform supports resctrl file system or not by looking > for resctrl in /proc/filesystems > 2. Calls opendir() on default resctrl file system path > (i.e. /sys/fs/resctrl) > 3. Checks if resctrl file system is mounted or not by looking at > /proc/mounts > > Steps 2 and 3 will fail if the platform does not support resctrl file > system. So, there is no need to check for them if step 1 fails. > > Fix this by returning immediately if the platform does not support > resctrl file system. > > Tested-by: Babu Moger > Signed-off-by: Fenghua Yu > --- > tools/testing/selftests/resctrl/resctrlfs.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c > index 6b22a186790a..87195eb78356 100644 > --- a/tools/testing/selftests/resctrl/resctrlfs.c > +++ b/tools/testing/selftests/resctrl/resctrlfs.c > @@ -570,6 +570,9 @@ bool check_resctrlfs_support(void) > ksft_print_msg("%s kernel supports resctrl filesystem\n", > ret ? "Pass:" : "Fail:"); > This message is a bit confusing. Please change this to read and send a follow-on patch on top of linux-kselftest next "Check kernel support for resctrl filesystem" thanks, -- Shuah