On Thu, 12 Mar 2026 17:55:27 +0530 Sayali Patil <[email protected]> wrote:
Hi all,
Powerpc systems with a 64K base page size exposed several issues while
running mm selftests. Some tests assume specific hugetlb configurations,
use incorrect interfaces, or fail instead of skipping when the required
kernel features are not available.
This series fixes these issues and improves test robustness.
Thanks, I updated mm.git's mm-new branch to this version.
---
v1->v2
- For "selftests/mm: ensure destination is hugetlb-backed in
hugepage-mremap":
update FLAGS definition to MAP_HUGETLB | MAP_SHARED | MAP_POPULATE and
used it for mmap() calls as suggested during review.
That was a really small change (below). It's better to wait a while
(half to one week) before resending an entire series. So as to
hopefully accumulate more changes.
--- a/tools/testing/selftests/mm/hugepage-mremap.c~b
+++ a/tools/testing/selftests/mm/hugepage-mremap.c
@@ -31,7 +31,7 @@
#define MB_TO_BYTES(x) (x * 1024 * 1024)
#define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC)
-#define FLAGS (MAP_SHARED | MAP_ANONYMOUS)
+#define FLAGS (MAP_HUGETLB | MAP_SHARED | MAP_POPULATE)
static void check_bytes(char *addr)
{
@@ -121,23 +121,20 @@ int main(int argc, char *argv[])
/* mmap to a PUD aligned address to hopefully trigger pmd sharing. */
unsigned long suggested_addr = 0x7eaa40000000;
- void *haddr = mmap((void *)suggested_addr, length, PROTECTION,
- MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);
+ void *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS,
fd, 0);
ksft_print_msg("Map haddr: Returned address is %p\n", haddr);
if (haddr == MAP_FAILED)
ksft_exit_fail_msg("mmap1: %s\n", strerror(errno));
/* mmap again to a dummy address to hopefully trigger pmd sharing. */
suggested_addr = 0x7daa40000000;
- void *daddr = mmap((void *)suggested_addr, length, PROTECTION,
- MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);
+ void *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS,
fd, 0);
ksft_print_msg("Map daddr: Returned address is %p\n", daddr);
if (daddr == MAP_FAILED)
ksft_exit_fail_msg("mmap3: %s\n", strerror(errno));
suggested_addr = 0x7faa40000000;
- void *vaddr = mmap((void *)suggested_addr, length, PROTECTION,
- MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);
+ void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS,
fd, 0);
ksft_print_msg("Map vaddr: Returned address is %p\n", vaddr);
if (vaddr == MAP_FAILED)
ksft_exit_fail_msg("mmap2: %s\n", strerror(errno));
_
