linux-kernel - Re: related to fixing depreciated api

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Date:   Tue, 15 Dec 2020 12:52:46 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Jeffrin Jose T <jeffrin@...agiritech.edu.in>,
        Shuah Khan <shuah@...nel.org>
Cc:     "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: related to fixing depreciated api

On 12/15/20 9:12 AM, Shuah Khan wrote:
> On 12/14/20 9:42 AM, Jeffrin Jose T wrote:
>> hello,
>>
>> i have worked on to  fix  depreciated api issue from
>> tools/testing/selftests/intel_pstate/aerf.c
>>
>> i met with the following error related...
>>
>> --------------x------------------x----------------->
>> $pwd
>> /home/jeffrin/UP/linux-kselftest/tools/testing/selftests/intel_pstate
>> $make
>> gcc  -Wall -D_GNU_SOURCE    aperf.c /home/jeffrin/UP/linux-
>> kselftest/tools/testing/selftests/kselftest_harness.h
>> /home/jeffrin/UP/linux-kselftest/tools/testing/selftests/kselftest.h -
>> lm -o /home/jeffrin/UP/linux-
>> kselftest/tools/testing/selftests/intel_pstate/aperf
>> aperf.c: In function ‘main’:
>> aperf.c:58:2: warning: ‘ftime’ is deprecated [-Wdeprecated-
>> declarations]
>>     58 |  ftime(&before);
>>        |  ^~~~~
>> In file included from aperf.c:9:
>> /usr/include/x86_64-linux-gnu/sys/timeb.h:39:12: note: declared here
>>     39 | extern int ftime (struct timeb *__timebuf)
>>        |            ^~~~~
>> aperf.c:67:2: warning: ‘ftime’ is deprecated [-Wdeprecated-
>> declarations]
>>     67 |  ftime(&after);
>>        |  ^~~~~
>> In file included from aperf.c:9:
>> /usr/include/x86_64-linux-gnu/sys/timeb.h:39:12: note: declared here
>>     39 | extern int ftime (struct timeb *__timebuf)
>>        |            ^~~~~
>> $
>> ----------------x---------------x---------------------->
>>
>>
>> from ftime manual  i found that it is depreciated...
>>
>> This  function is deprecated, and will be removed in a future version
>> of the GNU C library.  Use clock_gettime(2) instead.
>>
>>
>> now clock_gettime  gives  new data structure.
>>
>>   struct timespec {
>>                 time_t   tv_sec;        /* seconds */
>>                 long     tv_nsec;       /* nanoseconds */
>>             };
>>
>>
>> i worked on with the new data structure and some errors that came
>> along.
>> typical final output looks good but  values of runtime and typical
>> frequency
>> does not look normal during "sudo bash run.sh".
>>
>> output of "git diff" and  a  portion of output of   "sudo bash run.sh".
>> is attached.
>>
> 
> Please send a proper patch to fix intel_pstate to use clock_gettime.
> 

The fix for this is already in next - no need to send patch.

thanks,
-- Shuah