[Devel] [PATCH vz10] selftests: dma-buf: skip the huge page test without huge pages

[Eva Kurchatova]

The last udmabuf test backs a memfd with MFD_HUGETLB. Where no huge
pages are reserved the mapping fails and the whole test is reported as
a failure.

https://virtuozzo.atlassian.net/browse/VSTOR-142448
Feature: fix selftests
Signed-off-by: Eva Kurchatova <eva.kurchatova at virtuozzo.com>
---
 .../selftests/drivers/dma-buf/udmabuf.c       | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
index 6062723a172e..a3bb26c1991a 100644
--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
@@ -25,6 +25,21 @@
 
 static unsigned int page_size;
 
+static bool hugepages_available(void)
+{
+	unsigned long nr = 0;
+	FILE *f;
+
+	f = fopen("/proc/sys/vm/nr_hugepages", "r");
+	if (!f)
+		return false;
+	if (fscanf(f, "%lu", &nr) != 1)
+		nr = 0;
+	fclose(f);
+
+	return nr > 0;
+}
+
 static int create_memfd_with_seals(off64_t size, bool hpage)
 {
 	int memfd, ret;
@@ -234,6 +249,11 @@ int main(int argc, char *argv[])
 	close(memfd);
 
 	/* should work (migration of 2MB size huge pages)*/
+	if (!hugepages_available()) {
+		ksft_test_result_skip("%s: [SKIP,test-6] no huge pages\n", TEST_PREFIX);
+		close(devfd);
+		ksft_finished();
+	}
 	page_size = getpagesize() * 512; /* 2 MB */
 	size = MEMFD_SIZE * page_size;
 	memfd = create_memfd_with_seals(size, true);
-- 
2.55.0