linux-kernel - Re: [PATCH v1 1/1] selftests: mm: uufd-unit-tests: remove a format warning in printf

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Message-ID: <e6ca3de5-fbd2-1d93-6011-5ae0765b826d@collabora.com>
Date:   Mon, 12 Jun 2023 12:42:21 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        Peter Xu <peterx@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v1 1/1] selftests: mm: uufd-unit-tests: remove a format
 warning in printf

On 6/12/23 5:11 AM, Mirsad Goran Todorovac wrote:
> Apologies Muhammad then, didn't follow that branch.
No problem.

> 
> Regards,
> Mirsad
> 
> On 6/11/23 14:30, Muhammad Usama Anjum wrote:
>> The fix has already been picked up by Andew in mm unstable:
>>
>> https://lore.kernel.org/all/20230607023727.0E011C433D2@smtp.kernel.org
>>
>> On 6/11/23 4:50 AM, Mirsad Todorovac wrote:
>>> GCC 11.3.0 issued warnings about macros and types of arguments [edited]:
>>>
>>> gcc -Wall -I ../tools/testing/selftests/../../.. \
>>>     -I ../tools/testing/selftests/../../../tools/include/uapi \
>>>     -isystem ../usr/include -no-pie uffd-unit-tests.c vm_util.c \
>>>     uffd-common.c -lrt -lpthread -o \
>>>     ../tools/testing/selftests/mm/uffd-unit-tests
>>> uffd-unit-tests.c: In function ‘main’:
>>> uffd-unit-tests.c:1198:41: warning: format not a string literal and no \
>>>     format arguments [-Wformat-security]
>>>   1198 |                         uffd_test_start(test_name);
>>>        |                                         ^~~~~~~~~
>>> uffd-unit-tests.c:100:24: note: in definition of macro ‘uffd_test_start’
>>>    100 |                 printf(__VA_ARGS__);            \
>>>        |                        ^~~~~~~~~~~
>>> uffd-unit-tests.c:1205:33: warning: format not a string literal and no \
>>>     format arguments [-Wformat-security]
>>>   1205 |                                 uffd_test_skip(errmsg);
>>>        |                                 ^~~~~~~~~~~~~~
>>>
>>> The macros are defined as:
>>>
>>>   #define  uffd_test_start(...)  do {             \
>>>                  printf("Testing ");             \
>>>                  printf(__VA_ARGS__);            \
>>>                  printf("... ");                 \
>>>                  fflush(stdout);                 \
>>>          } while (0)
>>>
>>>   #define  uffd_test_skip(...)  do {              \
>>>                  printf("skipped [reason: ");    \
>>>                  printf(__VA_ARGS__);            \
>>>                  printf("]\n");                  \
>>>                  ksft_inc_xskip_cnt();           \
>>>          } while (0)
>>>
>>> Minor workaround, adding "%s" first argument to macro expansion calls seems
>>> to be the easiest way to eliminate the warnings.
>>>
>>> Cc: Peter Xu <peterx@...hat.com>
>>> Cc: linux-mm@...ck.org
>>> Cc: linux-kselftest@...r.kernel.org
>>> Fixes: 43759d44dc34 ("selftests/mm: add uffdio register ioctls test")
>>> Fixes: 16a45b57cbf2 ("selftests/mm: add framework for uffd-unit-test")
>>> Signed-off-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
>>> ---
>>>   tools/testing/selftests/mm/uffd-unit-tests.c | 4 ++--
>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c
>>> b/tools/testing/selftests/mm/uffd-unit-tests.c
>>> index 269c86768a02..d356dd271c84 100644
>>> --- a/tools/testing/selftests/mm/uffd-unit-tests.c
>>> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c
>>> @@ -1195,14 +1195,14 @@ int main(int argc, char *argv[])
>>>               snprintf(test_name, sizeof(test_name),
>>>                    "%s on %s", test->name, mem_type->name);
>>>   -            uffd_test_start(test_name);
>>> +            uffd_test_start("%s", test_name);
>>>               if (!uffd_feature_supported(test)) {
>>>                   uffd_test_skip("feature missing");
>>>                   continue;
>>>               }
>>>               if (uffd_setup_environment(&args, test, mem_type,
>>>                              &errmsg)) {
>>> -                uffd_test_skip(errmsg);
>>> +                uffd_test_skip("%s", errmsg);
>>>                   continue;
>>>               }
>>>               test->uffd_fn(&args);
>>

-- 
BR,
Muhammad Usama Anjum