linux-kernel - Re: [PATCH] selftests: memfd_test.c: fix compilation warning.

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Date:   Wed, 8 Nov 2017 11:22:05 +0800
From:   lei yang <lei.yang@...driver.com>
To:     Shuah Khan <shuahkh@....samsung.com>
CC:     <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests: memfd_test.c: fix compilation warning.

I got the same warning even with ubuntu new distro, this patch fixed 
this issue.

$ gcc --version
gcc (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ make -v
GNU Make 4.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ uname -a
Linux pek-lyang0-u17 4.10.0-38-generic #42-Ubuntu SMP Tue Oct 10 
13:24:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux


---------------------

memfd_test.c: In function mfd_assert_grow_write:
memfd_test.c:517:19: warning: format %d expects argument of type int, 
but argument 2 has type size_t {aka long unsigned int} [-Wformat=]
    printf("malloc(%d) failed: %m\n", mfd_def_size * 8);
                    ^
memfd_test.c: In function mfd_fail_grow_write:
memfd_test.c:537:19: warning: format %d expects argument of type int, 
but argument 2 has type size_t {aka long unsigned int} [-Wformat=]
    printf("malloc(%d) failed: %m\n", mfd_def_size * 8);



Lei


On 2017年11月07日 07:46, Shuah Khan wrote:
> On 11/05/2017 03:56 AM, Lei Yang wrote:
>> Replace '%d' by '%zu' to fix the following compilation warning.
>>
>> memfd_test.c:517:3: warning: format ‘%d’ expects argument of
>> type ‘int’,but argument 2 has type ‘size_t’ [-Wformat=]
>>     printf("malloc(%d) failed: %m\n", mfd_def_size * 8);
>>     ^
>> memfd_test.c: In function ‘mfd_fail_grow_write’:
>> memfd_test.c:537:3: warning: format ‘%d’ expects argument
>> of type ‘int’,but argument 2 has type ‘size_t’ [-Wformat=]
>>     printf("malloc(%d) failed: %m\n", mfd_def_size * 8);
>>
>> Signed-off-by: Lei Yang <Lei.Yang@...driver.com>
>> ---
>>   tools/testing/selftests/memfd/memfd_test.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
>> index f94c6d1..95df9e6 100644
>> --- a/tools/testing/selftests/memfd/memfd_test.c
>> +++ b/tools/testing/selftests/memfd/memfd_test.c
>> @@ -514,7 +514,7 @@ static void mfd_assert_grow_write(int fd)
>>   
>>   	buf = malloc(mfd_def_size * 8);
>>   	if (!buf) {
>> -		printf("malloc(%d) failed: %m\n", mfd_def_size * 8);
>> +		printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
>>   		abort();
>>   	}
>>   
>> @@ -534,7 +534,7 @@ static void mfd_fail_grow_write(int fd)
>>   
>>   	buf = malloc(mfd_def_size * 8);
>>   	if (!buf) {
>> -		printf("malloc(%d) failed: %m\n", mfd_def_size * 8);
>> +		printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
>>   		abort();
>>   	}
>>   
>>
> Relates to gcc version perhaps. What's your gcc version?
>
> thanks,
> -- Shuah