On systems with 64k page size and 512M huge page sizes, the allocation
and test succeeds but errors out at the munmap. As the comment states,
munmap will failure if its not HUGEPAGE aligned. This is due to the
length of the mapping being 1/2 the size of the hugepage causing the
munmap to not be hugepage aligned. Fix this by making the mapping length
the full hugepage if the hugepage is larger than the length of the
mapping.
Signed-off-by: Nico Pache <npache@xxxxxxxxxx>
---
tools/testing/selftests/mm/map_hugetlb.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tools/testing/selftests/mm/map_hugetlb.c b/tools/testing/selftests/mm/map_hugetlb.c
index 193281560b61..86e8f2048a40 100644
--- a/tools/testing/selftests/mm/map_hugetlb.c
+++ b/tools/testing/selftests/mm/map_hugetlb.c
@@ -15,6 +15,7 @@
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>
+#include "vm_util.h"
#define LENGTH (256UL*1024*1024)
#define PROTECTION (PROT_READ | PROT_WRITE)
@@ -58,10 +59,16 @@ int main(int argc, char **argv)
{
void *addr;
int ret;
+ size_t hugepage_size;
size_t length = LENGTH;
int flags = FLAGS;
int shift = 0;
+ hugepage_size = default_huge_page_size();
+ /* munmap with fail if the length is not page aligned */
+ if (hugepage_size > length)
+ length = hugepage_size;
+
if (argc > 1)
length = atol(argv[1]) << 20;
if (argc > 2) {
--
2.43.0
