linux-kernel - Re: [PATCH 1/1] selftests/mm: include mman header to access MREMAP

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Message-ID: <018dfa44-785c-403a-a085-c13ee73933df@collabora.com>
Date:   Thu, 12 Oct 2023 13:17:27 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Samasth Norway Ananda <samasth.norway.ananda@...cle.com>,
        akpm@...ux-foundation.org, shuah@...nel.org
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] selftests/mm: include mman header to access
 MREMAP_DONTUNMAP identifier

On 10/12/23 1:06 PM, Muhammad Usama Anjum wrote:
> On 10/12/23 11:40 AM, Samasth Norway Ananda wrote:
>> Definition for MREMAP_DONTUNMAP not present in the selftest for
>> mremap_dontunmap thus throwing an undeclared error when running make
>> on mm.
> Thanks for sending the patch.
> 
> You have mentioned in other email that MREMAP_DONTUNMAP isn't present in
> glibc older than 2.32. So including linux/mman.h solves the build error for
> people having older glibc. Please add this to the description of the patch
> to give the exact reason this patch should be accepted.
> 
>>
>> Fixes: 0183d777c29a ("selftests: mm: remove duplicate unneeded defines")
>> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>> Closes: https://lore.kernel.org/linux-mm/CA+G9fYvV-71XqpCr_jhdDfEtN701fBdG3q+=bafaZiGwUXy_aA@mail.gmail.com/
>> Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@...cle.com>
>> ---
>>  tools/testing/selftests/mm/mremap_dontunmap.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/tools/testing/selftests/mm/mremap_dontunmap.c b/tools/testing/selftests/mm/mremap_dontunmap.c
>> index ca2359835e75..a06e73ec8568 100644
>> --- a/tools/testing/selftests/mm/mremap_dontunmap.c
>> +++ b/tools/testing/selftests/mm/mremap_dontunmap.c
>> @@ -7,6 +7,7 @@
>>   */
>>  #define _GNU_SOURCE
>>  #include <sys/mman.h>
>> +#include <linux/mman.h>
>>  #include <errno.h>
>>  #include <stdio.h>
>>  #include <stdlib.h>
> Tested-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
Just to add more context, the build error doesn't trigger on latest glibc.
I've tested building this test with glic 2.31 and there is build error.
This patch fixes the build error.

> 

-- 
BR,
Muhammad Usama Anjum