+ selftests-vm-use-memfd-for-hugepage-mmap-test.patch added to mm-unstable branch

+ selftests-vm-use-memfd-for-hugepage-mmap-test.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: selftests/vm: use memfd for hugepage-mmap test
has been added to the -mm mm-unstable branch.  Its filename is
     selftests-vm-use-memfd-for-hugepage-mmap-test.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-vm-use-memfd-for-hugepage-mmap-test.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: selftests/vm: use memfd for hugepage-mmap test
Date: Thu, 17 Nov 2022 16:29:15 -0500

This test was overlooked with a hard-coded mntpoint path in test when
we're removing the hugetlb mntpoint in commit 0796c7b8be84.  Fix it up so
the test can keep running.

Link: https://lkml.kernel.org/r/Y3aojfUC2nSwbCzB@x1n
Fixes: 0796c7b8be84 ("selftests/vm: drop mnt point for hugetlb in run_vmtests.sh")
Signed-off-by: Peter Xu <peterx@redhat.com>
Reported-by: Joel Savitz <jsavitz@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/vm/hugepage-mmap.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/tools/testing/selftests/vm/hugepage-mmap.c~selftests-vm-use-memfd-for-hugepage-mmap-test
+++ a/tools/testing/selftests/vm/hugepage-mmap.c
@@ -16,14 +16,13 @@
  * range.
  * Other architectures, such as ppc64, i386 or x86_64 are not so constrained.
  */
-
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <sys/mman.h>
 #include <fcntl.h>
 
-#define FILE_NAME "huge/hugepagefile"
 #define LENGTH (256UL*1024*1024)
 #define PROTECTION (PROT_READ | PROT_WRITE)
 
@@ -67,16 +66,16 @@ int main(void)
 	void *addr;
 	int fd, ret;
 
-	fd = open(FILE_NAME, O_CREAT | O_RDWR, 0755);
+	fd = memfd_create("hugepage-mmap", MFD_HUGETLB);
 	if (fd < 0) {
-		perror("Open failed");
+		perror("memfd_create() failed");
 		exit(1);
 	}
 
 	addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, fd, 0);
 	if (addr == MAP_FAILED) {
 		perror("mmap");
-		unlink(FILE_NAME);
+		close(fd);
 		exit(1);
 	}
 
@@ -87,7 +86,6 @@ int main(void)
 
 	munmap(addr, LENGTH);
 	close(fd);
-	unlink(FILE_NAME);
 
 	return ret;
 }
_

Patches currently in -mm which might be from peterx@redhat.com are

mm-migrate-fix-read-only-page-got-writable-when-recover-pte.patch
mm-always-compile-in-pte-markers.patch
mm-use-pte-markers-for-swap-errors.patch
mm-uffd-sanity-check-write-bit-for-uffd-wp-protected-ptes.patch
selftests-vm-use-memfd-for-hugepage-mmap-test.patch