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Date:   Wed, 19 Jan 2022 15:15:31 +0500
From:   Muhammad Usama Anjum <>
To:     Shuah Khan <>,
        Thomas Gleixner <>,
        Ingo Molnar <>,
        Peter Zijlstra <>,
        Darren Hart <>,
        Davidlohr Bueso <>,
        André Almeida <>,
        Paolo Bonzini <>,
        Mickaël Salaün <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Mat Martineau <>,
        Matthieu Baerts <>,
        Andrew Morton <>,
        chiminghao <>, (open list:KERNEL SELFTEST FRAMEWORK), (open list), (open list:KERNEL VIRTUAL MACHINE (KVM)), (open list:LANDLOCK SECURITY
        MODULE), (open list:NETWORKING [GENERAL]), (open list:NETWORKING [MPTCP]), (open list:MEMORY MANAGEMENT)
Cc:     Muhammad Usama Anjum <>,
Subject: [PATCH V2 10/10] selftests: vm: remove dependecy from internal kernel macros

The defination of swap() is used from kernel's internal header when this
test is built in source tree. The build fails when this test is built
out of source tree as defination of swap() isn't found. Selftests
shouldn't depend on kernel's internal header files. They can only depend
on uapi header files. Add the defination of swap() to fix the build

	gcc -Wall  -I/linux_mainline2/build/usr/include -no-pie    userfaultfd.c -lrt -lpthread -o /linux_mainline2/build/kselftest/vm/userfaultfd
	userfaultfd.c: In function ‘userfaultfd_stress’:
	userfaultfd.c:1530:3: warning: implicit declaration of function ‘swap’; did you mean ‘swab’? [-Wimplicit-function-declaration]
	 1530 |   swap(area_src, area_dst);
	      |   ^~~~
	      |   swab
	/usr/bin/ld: /tmp/cclUUH7V.o: in function `userfaultfd_stress':
	userfaultfd.c:(.text+0x4d64): undefined reference to `swap'
	/usr/bin/ld: userfaultfd.c:(.text+0x4d82): undefined reference to `swap'
	collect2: error: ld returned 1 exit status

Fixes: 2c769ed7137a ("tools/testing/selftests/vm/userfaultfd.c: use swap() to make code cleaner")
Signed-off-by: Muhammad Usama Anjum <>
 tools/testing/selftests/vm/userfaultfd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index d3fd24f9fae8..d2480ab93037 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -119,6 +119,9 @@ struct uffd_stats {
 				 ~(unsigned long)(sizeof(unsigned long long) \
 						  -  1)))
+#define swap(a, b) \
+	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
 const char *examples =
     "# Run anonymous memory test on 100MiB region with 99999 bounces:\n"
     "./userfaultfd anon 100 99999\n\n"

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