linux-kernel - [PATCH 2/2] kselftest/vm: fix tests build with old libc

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Date:   Sun, 27 Feb 2022 13:53:30 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     akpm@...ux-foundation.org, shuah@...nel.org
Cc:     linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH 2/2] kselftest/vm: fix tests build with old libc

The error message when I build vm tests on debian10 (GLIBC 2.28):

userfaultfd.c: In function ‘userfaultfd_pagemap_test’:
userfaultfd.c:1393:37: error: ‘MADV_PAGEOUT’ undeclared (first use
in this function); did you mean ‘MADV_RANDOM’?
  if (madvise(area_dst, test_pgsize, MADV_PAGEOUT))
                                     ^~~~~~~~~~~~
                                     MADV_RANDOM

This patch includes these newer definitions from UAPI linux/mman.h,
is useful to fix tests build on systems without these definitions in
glibc sys/mman.h.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 tools/testing/selftests/vm/userfaultfd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 2f49c9af1b58..3fc1d2ee2948 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -46,6 +46,7 @@
 #include <signal.h>
 #include <poll.h>
 #include <string.h>
+#include <linux/mman.h>
 #include <sys/mman.h>
 #include <sys/syscall.h>
 #include <sys/ioctl.h>
-- 
2.20.1