[PATCH bpf-next v4 2/4] selftests/bpf: Fix bpf_mod_race test failure with arm64 64KB page size

[Yonghong Song <yonghong.song@xxxxxxxxx>]

Currently, uffd_register.range.len is set to 4096 for command
'ioctl(uffd, UFFDIO_REGISTER, &uffd_register)'. For arm64 64KB page size,
the len must be 64KB size aligned as page size alignment is required.
See fs/userfaultfd.c:validate_unaligned_range().

Signed-off-by: Yonghong Song <yonghong.song@xxxxxxxxx>
---
 tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c b/tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c
index fe2c502e5089..ecc3d47919ad 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_mod_race.c
@@ -78,7 +78,7 @@ static int test_setup_uffd(void *fault_addr)
 	}
 
 	uffd_register.range.start = (unsigned long)fault_addr;
-	uffd_register.range.len = 4096;
+	uffd_register.range.len = getpagesize();
 	uffd_register.mode = UFFDIO_REGISTER_MODE_MISSING;
 	if (ioctl(uffd, UFFDIO_REGISTER, &uffd_register)) {
 		close(uffd);
-- 
2.47.1