Subtests 6 and 7 of the udmabuf test require free huge pages. If there
are not enough huge pages available, the entire test fails on an mmap:
ok 4 drivers/dma-buf/udmabuf: [PASS,test-4]
ok 5 drivers/dma-buf/udmabuf: [PASS,test-5]
drivers/dma-buf/udmabuf: ubuf_fd mmap fail
Instead of failing, check if there are enough huge pages available
beforehand and potentially skip the subtests 6 and 7.
Signed-off-by: Chris Gellermann <[email protected]>
---
.../selftests/drivers/dma-buf/udmabuf.c | 36 +++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
index 2def04ed3451..daa2fc6c2c27 100644
--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
@@ -25,6 +25,34 @@
static unsigned int page_size;
+static bool enough_free_huge_pages(off_t size)
+{
+ unsigned long free_pages = 0, hpage_size_kb = 0;
+ bool found_free = false, found_size = false;
+ char line[256];
+ FILE *f;
+
+ f = fopen("/proc/meminfo", "r");
+ if (!f)
+ return false;
+
+ while (fgets(line, sizeof(line), f)) {
+ if (sscanf(line, "HugePages_Free: %lu", &free_pages) == 1)
+ found_free = true;
+ if (sscanf(line, "Hugepagesize: %lu kB", &hpage_size_kb) == 1)
+ found_size = true;
+ if (found_free && found_size)
+ break;
+ }
+ fclose(f);
+
+ if (!found_free || !found_size)
+ return false;
+
+ return ((unsigned long long)free_pages * hpage_size_kb * 1024ULL) >=
+ (unsigned long long)size;
+}
+
static int create_memfd_with_seals(off_t size, bool hpage)
{
int memfd, ret;
@@ -236,6 +264,13 @@ int main(int argc, char *argv[])
/* should work (migration of 2MB size huge pages)*/
page_size = getpagesize() * 512; /* 2 MB */
size = MEMFD_SIZE * page_size;
+ if (!enough_free_huge_pages(size)) {
+ ksft_test_result_skip("%s: [SKIP,test-6] not enough huge
pages\n",
+ TEST_PREFIX);
+ ksft_test_result_skip("%s: [SKIP,test-7] not enough huge
pages\n",
+ TEST_PREFIX);
+ goto out;
+ }
memfd = create_memfd_with_seals(size, true);
addr1 = mmap_fd(memfd, size);
write_to_memfd(addr1, size, 'a');
@@ -268,6 +303,7 @@ int main(int argc, char *argv[])
close(buf);
close(memfd);
+out:
close(devfd);
ksft_print_msg("%s: ok\n", TEST_PREFIX);
--
2.47.3
