+ selftests-mm-reuse-pagemap_get_entry-in-vm_utilh.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: selftests/mm: reuse pagemap_get_entry() in vm_util.h
has been added to the -mm mm-unstable branch.  Its filename is
     selftests-mm-reuse-pagemap_get_entry-in-vm_utilh.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-reuse-pagemap_get_entry-in-vm_utilh.patch

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

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: selftests/mm: reuse pagemap_get_entry() in vm_util.h
Date: Wed, 12 Apr 2023 12:42:31 -0400

Meanwhile drop pagemap_read_vaddr().

Link: https://lkml.kernel.org/r/20230412164231.328157-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/userfaultfd.c |   31 ++++++---------------
 1 file changed, 9 insertions(+), 22 deletions(-)

--- a/tools/testing/selftests/mm/userfaultfd.c~selftests-mm-reuse-pagemap_get_entry-in-vm_utilh
+++ a/tools/testing/selftests/mm/userfaultfd.c
@@ -1399,19 +1399,6 @@ static int pagemap_open(void)
 	return fd;
 }
 
-static uint64_t pagemap_read_vaddr(int fd, void *vaddr)
-{
-	uint64_t value;
-	int ret;
-
-	ret = pread(fd, &value, sizeof(uint64_t),
-		    ((uint64_t)vaddr >> 12) * sizeof(uint64_t));
-	if (ret != sizeof(uint64_t))
-		err("pread() on pagemap failed");
-
-	return value;
-}
-
 /* This macro let __LINE__ works in err() */
 #define  pagemap_check_wp(value, wp) do {				\
 		if (!!(value & PM_UFFD_WP) != wp)			\
@@ -1427,7 +1414,7 @@ static int pagemap_test_fork(bool presen
 	if (!child) {
 		/* Open the pagemap fd of the child itself */
 		fd = pagemap_open();
-		value = pagemap_read_vaddr(fd, area_dst);
+		value = pagemap_get_entry(fd, area_dst);
 		/*
 		 * After fork() uffd-wp bit should be gone as long as we're
 		 * without UFFD_FEATURE_EVENT_FORK
@@ -1446,24 +1433,24 @@ static void userfaultfd_wp_unpopulated_t
 
 	/* Test applying pte marker to anon unpopulated */
 	wp_range(uffd, (uint64_t)area_dst, page_size, true);
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, true);
 
 	/* Test unprotect on anon pte marker */
 	wp_range(uffd, (uint64_t)area_dst, page_size, false);
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, false);
 
 	/* Test zap on anon marker */
 	wp_range(uffd, (uint64_t)area_dst, page_size, true);
 	if (madvise(area_dst, page_size, MADV_DONTNEED))
 		err("madvise(MADV_DONTNEED) failed");
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, false);
 
 	/* Test fault in after marker removed */
 	*area_dst = 1;
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, false);
 	/* Drop it to make pte none again */
 	if (madvise(area_dst, page_size, MADV_DONTNEED))
@@ -1522,7 +1509,7 @@ static void userfaultfd_pagemap_test(uns
 	/* Touch the page */
 	*area_dst = 1;
 	wp_range(uffd, (uint64_t)area_dst, test_pgsize, true);
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, true);
 	/* Make sure uffd-wp bit dropped when fork */
 	if (pagemap_test_fork(true))
@@ -1536,7 +1523,7 @@ static void userfaultfd_pagemap_test(uns
 		err("madvise(MADV_PAGEOUT) failed");
 
 	/* Uffd-wp should persist even swapped out */
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, true);
 	/* Make sure uffd-wp bit dropped when fork */
 	if (pagemap_test_fork(false))
@@ -1544,12 +1531,12 @@ static void userfaultfd_pagemap_test(uns
 
 	/* Unprotect; this tests swap pte modifications */
 	wp_range(uffd, (uint64_t)area_dst, page_size, false);
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, false);
 
 	/* Fault in the page from disk */
 	*area_dst = 2;
-	value = pagemap_read_vaddr(pagemap_fd, area_dst);
+	value = pagemap_get_entry(pagemap_fd, area_dst);
 	pagemap_check_wp(value, false);
 
 	close(pagemap_fd);
_

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

mm-khugepaged-check-again-on-anon-uffd-wp-during-isolation.patch
revert-userfaultfd-dont-fail-on-unrecognized-features.patch
selftests-mm-update-gitignore-with-two-missing-tests.patch
selftests-mm-dump-a-summary-in-run_vmtestssh.patch
selftests-mm-merge-utilh-into-vm_utilh.patch
selftests-mm-use-test_gen_progs-where-proper.patch
selftests-mm-link-vm_utilc-always.patch
selftests-mm-merge-default_huge_page_size-into-one.patch
selftests-mm-use-pm_-macros-in-vm_utilsh.patch
selftests-mm-reuse-pagemap_get_entry-in-vm_utilh.patch
selftests-mm-test-uffdio_zeropage-only-when-hugetlb.patch
selftests-mm-drop-test_uffdio_zeropage_eexist.patch
selftests-mm-create-uffd-common.patch
selftests-mm-split-uffd-tests-into-uffd-stress-and-uffd-unit-tests.patch
selftests-mm-uffd_register.patch
selftests-mm-uffd_open_devsys.patch
selftests-mm-uffdio_api-test.patch
selftests-mm-drop-global-mem_fd-in-uffd-tests.patch
selftests-mm-drop-global-hpage_size-in-uffd-tests.patch
selftests-mm-rename-uffd_stats-to-uffd_args.patch
selftests-mm-let-uffd_handle_page_fault-take-wp-parameter.patch
selftests-mm-allow-allocate_area-to-fail-properly.patch
selftests-mm-add-framework-for-uffd-unit-test.patch
selftests-mm-move-uffd-pagemap-test-to-unit-test.patch
selftests-mm-move-uffd-minor-test-to-unit-test.patch
selftests-mm-move-uffd-sig-events-tests-into-uffd-unit-tests.patch
selftests-mm-move-zeropage-test-into-uffd-unit-tests.patch
selftests-mm-workaround-no-way-to-detect-uffd-minor-wp.patch
selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege.patch
selftests-mm-drop-sys-dev-test-in-uffd-stress-test.patch
selftests-mm-add-shmem-private-test-to-uffd-stress.patch
selftests-mm-add-uffdio-register-ioctls-test.patch