userfaultfd: selftest: only warn if __NR_userfaultfd is undefined
If __NR_userfaultfd is not yet defined by the arch, warn but still build
and run the userfaultfd selftest successfully.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index a9e0b91..0671ae1 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -66,9 +66,7 @@
#include <pthread.h>
#include <linux/userfaultfd.h>
-#ifndef __NR_userfaultfd
-#error "missing __NR_userfaultfd definition"
-#endif
+#ifdef __NR_userfaultfd
static unsigned long nr_cpus, nr_pages, nr_pages_per_cpu, page_size;
@@ -631,3 +629,15 @@
nr_pages, nr_pages_per_cpu);
return userfaultfd_stress();
}
+
+#else /* __NR_userfaultfd */
+
+#warning "missing __NR_userfaultfd definition"
+
+int main(void)
+{
+ printf("skip: Skipping userfaultfd test (missing __NR_userfaultfd)\n");
+ return 0;
+}
+
+#endif /* __NR_userfaultfd */