linux-kernel - Re: PROBLEM: selftest/vm/cow.c failed to compile (‘MADV

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Date:   Mon, 9 Jan 2023 22:41:01 +0100
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: selftest/vm/cow.c failed to compile (‘MADV_PAGEOUT’ undeclared)

On 1/9/2023 5:42 PM, David Hildenbrand wrote:

Hi, thank you for your reply.

>> I hope this is enough information for you to debug the issue.
>>
>> I am standing by for any additional diagnostics needed.
> 
> Won't userfaultfd.c fail in a similar way?
> 
> Anyhow, khugepaged.c jas
> 
> #ifndef MADV_PAGEOUT
> #define MADV_PAGEOUT 21
> #endif
> 
> So most probably we should do the same.

Actually, David, it turned out that userfaultfd.c compiled 
out-of-the-box, and side-by-side comparison showed that it also included 
"/home/marvin/linux/kernel/linux_torvalds/usr/include/asm-generic/mman-common.h"

The only remaining difference was including <linux/mman.h>, which fixed 
the issue w/o #ifdef ... #endif

Hope this helps.

Please find the following diff.

Regards,
Mirsad

------------------------------------------------------------------------------
diff --git a/tools/testing/selftests/vm/cow.c 
b/tools/testing/selftests/vm/cow.c
index 26f6ea3079e2..dd8cf12c6776 100644
--- a/tools/testing/selftests/vm/cow.c
+++ b/tools/testing/selftests/vm/cow.c
@@ -16,6 +16,7 @@
  #include <fcntl.h>
  #include <dirent.h>
  #include <assert.h>
+#include <linux/mman.h>
  #include <sys/mman.h>
  #include <sys/ioctl.h>
  #include <sys/wait.h>




--
Mirsad Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
-- 
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
tel. +385 (0)1 3711 451
mob. +385 91 57 88 355