Merge tag 'mm-hotfixes-stable-2024-09-03-20-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "17 hotfixes, 15 of which are cc:stable.

  Mostly MM, no identifiable theme.  And a few nilfs2 fixups"

* tag 'mm-hotfixes-stable-2024-09-03-20-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  alloc_tag: fix allocation tag reporting when CONFIG_MODULES=n
  mm: vmalloc: optimize vmap_lazy_nr arithmetic when purging each vmap_area
  mailmap: update entry for Jan Kuliga
  codetag: debug: mark codetags for poisoned page as empty
  mm/memcontrol: respect zswap.writeback setting from parent cg too
  scripts: fix gfp-translate after ___GFP_*_BITS conversion to an enum
  Revert "mm: skip CMA pages when they are not available"
  maple_tree: remove rcu_read_lock() from mt_validate()
  kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y
  mm/slub: add check for s->flags in the alloc_tagging_slab_free_hook
  nilfs2: fix state management in error path of log writing function
  nilfs2: fix missing cleanup on rollforward recovery error
  nilfs2: protect references to superblock parameters exposed in sysfs
  userfaultfd: don't BUG_ON() if khugepaged yanks our page table
  userfaultfd: fix checks for huge PMDs
  mm: vmalloc: ensure vmap_block is initialised before adding to queue
  selftests: mm: fix build errors on armhf

17 files changed, 197 insertions, 124 deletions

diff --git a/.mailmap b/.mailmap
index caf46a652f15..a7969e2d590a 100644
--- a/.mailmap
+++ b/.mailmap
@@ -269,6 +269,7 @@ James Ketrenos <jketreno@io.(none)>
 Jan Glauber <jan.glauber@gmail.com> <jang@de.ibm.com>
 Jan Glauber <jan.glauber@gmail.com> <jang@linux.vnet.ibm.com>
 Jan Glauber <jan.glauber@gmail.com> <jglauber@cavium.com>
+Jan Kuliga <jtkuliga.kdev@gmail.com> <jankul@alatek.krakow.pl>
 Jarkko Sakkinen <jarkko@kernel.org> <jarkko.sakkinen@linux.intel.com>
 Jarkko Sakkinen <jarkko@kernel.org> <jarkko@profian.com>
 Jarkko Sakkinen <jarkko@kernel.org> <jarkko.sakkinen@tuni.fi>
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 86311c2907cd..95c18bc17083 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1717,9 +1717,10 @@ The following nested keys are defined.
 	entries fault back in or are written out to disk.
 
   memory.zswap.writeback
-	A read-write single value file. The default value is "1". The
-	initial value of the root cgroup is 1, and when a new cgroup is
-	created, it inherits the current value of its parent.
+	A read-write single value file. The default value is "1".
+	Note that this setting is hierarchical, i.e. the writeback would be
+	implicitly disabled for child cgroups if the upper hierarchy
+	does so.
 
 	When this is set to 0, all swapping attempts to swapping devices
 	are disabled. This included both zswap writebacks, and swapping due
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index b638dc06df2f..61e25a980f73 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -716,6 +716,33 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
 }
 
 /**
+ * nilfs_abort_roll_forward - cleaning up after a failed rollforward recovery
+ * @nilfs: nilfs object
+ */
+static void nilfs_abort_roll_forward(struct the_nilfs *nilfs)
+{
+	struct nilfs_inode_info *ii, *n;
+	LIST_HEAD(head);
+
+	/* Abandon inodes that have read recovery data */
+	spin_lock(&nilfs->ns_inode_lock);
+	list_splice_init(&nilfs->ns_dirty_files, &head);
+	spin_unlock(&nilfs->ns_inode_lock);
+	if (list_empty(&head))
+		return;
+
+	set_nilfs_purging(nilfs);
+	list_for_each_entry_safe(ii, n, &head, i_dirty) {
+		spin_lock(&nilfs->ns_inode_lock);
+		list_del_init(&ii->i_dirty);
+		spin_unlock(&nilfs->ns_inode_lock);
+
+		iput(&ii->vfs_inode);
+	}
+	clear_nilfs_purging(nilfs);
+}
+
+/**
  * nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint
  * @nilfs: nilfs object
  * @sb: super block instance
@@ -773,15 +800,19 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
 		if (unlikely(err)) {
 			nilfs_err(sb, "error %d writing segment for recovery",
 				  err);
-			goto failed;
+			goto put_root;
 		}
 
 		nilfs_finish_roll_forward(nilfs, ri);
 	}
 
- failed:
+put_root:
 	nilfs_put_root(root);
 	return err;
+
+failed:
+	nilfs_abort_roll_forward(nilfs);
+	goto put_root;
 }
 
 /**
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 0ca3110d6386..871ec35ea8e8 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1812,6 +1812,9 @@ static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
 	nilfs_abort_logs(&logs, ret ? : err);
 
 	list_splice_tail_init(&sci->sc_segbufs, &logs);
+	if (list_empty(&logs))
+		return; /* if the first segment buffer preparation failed */
+
 	nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
 	nilfs_free_incomplete_logs(&logs, nilfs);
 
@@ -2056,7 +2059,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
 
 		err = nilfs_segctor_begin_construction(sci, nilfs);
 		if (unlikely(err))
-			goto out;
+			goto failed;
 
 		/* Update time stamp */
 		sci->sc_seg_ctime = ktime_get_real_seconds();
@@ -2120,10 +2123,9 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
 	return err;
 
  failed_to_write:
-	if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
-		nilfs_redirty_inodes(&sci->sc_dirty_files);
-
  failed:
+	if (mode == SC_LSEG_SR && nilfs_sc_cstage_get(sci) >= NILFS_ST_IFILE)
+		nilfs_redirty_inodes(&sci->sc_dirty_files);
 	if (nilfs_doing_gc())
 		nilfs_redirty_inodes(&sci->sc_gc_inodes);
 	nilfs_segctor_abort_construction(sci, nilfs, err);
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index a5569b7f47a3..14868a3dd592 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -836,9 +836,15 @@ ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
 				struct the_nilfs *nilfs,
 				char *buf)
 {
-	struct nilfs_super_block **sbp = nilfs->ns_sbp;
-	u32 major = le32_to_cpu(sbp[0]->s_rev_level);
-	u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
+	struct nilfs_super_block *raw_sb;
+	u32 major;
+	u16 minor;
+
+	down_read(&nilfs->ns_sem);
+	raw_sb = nilfs->ns_sbp[0];
+	major = le32_to_cpu(raw_sb->s_rev_level);
+	minor = le16_to_cpu(raw_sb->s_minor_rev_level);
+	up_read(&nilfs->ns_sem);
 
 	return sysfs_emit(buf, "%d.%d\n", major, minor);
 }
@@ -856,8 +862,13 @@ ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
 				    struct the_nilfs *nilfs,
 				    char *buf)
 {
-	struct nilfs_super_block **sbp = nilfs->ns_sbp;
-	u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
+	struct nilfs_super_block *raw_sb;
+	u64 dev_size;
+
+	down_read(&nilfs->ns_sem);
+	raw_sb = nilfs->ns_sbp[0];
+	dev_size = le64_to_cpu(raw_sb->s_dev_size);
+	up_read(&nilfs->ns_sem);
 
 	return sysfs_emit(buf, "%llu\n", dev_size);
 }
@@ -879,9 +890,15 @@ ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
 			    struct the_nilfs *nilfs,
 			    char *buf)
 {
-	struct nilfs_super_block **sbp = nilfs->ns_sbp;
+	struct nilfs_super_block *raw_sb;
+	ssize_t len;
 
-	return sysfs_emit(buf, "%pUb\n", sbp[0]->s_uuid);
+	down_read(&nilfs->ns_sem);
+	raw_sb = nilfs->ns_sbp[0];
+	len = sysfs_emit(buf, "%pUb\n", raw_sb->s_uuid);
+	up_read(&nilfs->ns_sem);
+
+	return len;
 }
 
 static
@@ -889,10 +906,16 @@ ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
 				    struct the_nilfs *nilfs,
 				    char *buf)
 {
-	struct nilfs_super_block **sbp = nilfs->ns_sbp;
+	struct nilfs_super_block *raw_sb;
+	ssize_t len;
+
+	down_read(&nilfs->ns_sem);
+	raw_sb = nilfs->ns_sbp[0];
+	len = scnprintf(buf, sizeof(raw_sb->s_volume_name), "%s\n",
+			raw_sb->s_volume_name);
+	up_read(&nilfs->ns_sem);
 
-	return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
-			 sbp[0]->s_volume_name);
+	return len;
 }
 
 static const char dev_readme_str[] =
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 3d64290d24c9..3eedb8c226ad 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -752,7 +752,7 @@ static int kexec_calculate_store_digests(struct kimage *image)
 
 #ifdef CONFIG_CRASH_HOTPLUG
 		/* Exclude elfcorehdr segment to allow future changes via hotplug */
-		if (j == image->elfcorehdr_index)
+		if (i == image->elfcorehdr_index)
 			continue;
 #endif
 
diff --git a/lib/codetag.c b/lib/codetag.c
index 5ace625f2328..afa8a2d4f317 100644
--- a/lib/codetag.c
+++ b/lib/codetag.c
@@ -125,7 +125,6 @@ static inline size_t range_size(const struct codetag_type *cttype,
 			cttype->desc.tag_size;
 }
 
-#ifdef CONFIG_MODULES
 static void *get_symbol(struct module *mod, const char *prefix, const char *name)
 {
 	DECLARE_SEQ_BUF(sb, KSYM_NAME_LEN);
@@ -155,6 +154,15 @@ static struct codetag_range get_section_range(struct module *mod,
 	};
 }
 
+static const char *get_mod_name(__maybe_unused struct module *mod)
+{
+#ifdef CONFIG_MODULES
+	if (mod)
+		return mod->name;
+#endif
+	return "(built-in)";
+}
+
 static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 {
 	struct codetag_range range;
@@ -164,8 +172,7 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 	range = get_section_range(mod, cttype->desc.section);
 	if (!range.start || !range.stop) {
 		pr_warn("Failed to load code tags of type %s from the module %s\n",
-			cttype->desc.section,
-			mod ? mod->name : "(built-in)");
+			cttype->desc.section, get_mod_name(mod));
 		return -EINVAL;
 	}
 
@@ -199,6 +206,7 @@ static int codetag_module_init(struct codetag_type *cttype, struct module *mod)
 	return 0;
 }
 
+#ifdef CONFIG_MODULES
 void codetag_load_module(struct module *mod)
 {
 	struct codetag_type *cttype;
@@ -248,9 +256,6 @@ bool codetag_unload_module(struct module *mod)
 
 	return unload_ok;
 }
-
-#else /* CONFIG_MODULES */
-static int codetag_module_init(struct codetag_type *cttype, struct module *mod) { return 0; }
 #endif /* CONFIG_MODULES */
 
 struct codetag_type *
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index aa3a5df15b8e..6df3a8b95808 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -7566,14 +7566,14 @@ static void mt_validate_nulls(struct maple_tree *mt)
  * 2. The gap is correctly set in the parents
  */
 void mt_validate(struct maple_tree *mt)
+	__must_hold(mas->tree->ma_lock)
 {
 	unsigned char end;
 
 	MA_STATE(mas, mt, 0, 0);
-	rcu_read_lock();
 	mas_start(&mas);
 	if (!mas_is_active(&mas))
-		goto done;
+		return;
 
 	while (!mte_is_leaf(mas.node))
 		mas_descend(&mas);
@@ -7594,9 +7594,6 @@ void mt_validate(struct maple_tree *mt)
 		mas_dfs_postorder(&mas, ULONG_MAX);
 	}
 	mt_validate_nulls(mt);
-done:
-	rcu_read_unlock();
-
 }
 EXPORT_SYMBOL_GPL(mt_validate);
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f29157288b7d..d563fb515766 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3613,8 +3613,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 	memcg1_soft_limit_reset(memcg);
 #ifdef CONFIG_ZSWAP
 	memcg->zswap_max = PAGE_COUNTER_MAX;
-	WRITE_ONCE(memcg->zswap_writeback,
-		!parent || READ_ONCE(parent->zswap_writeback));
+	WRITE_ONCE(memcg->zswap_writeback, true);
 #endif
 	page_counter_set_high(&memcg->swap, PAGE_COUNTER_MAX);
 	if (parent) {
@@ -5320,7 +5319,14 @@ void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size)
 bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg)
 {
 	/* if zswap is disabled, do not block pages going to the swapping device */
-	return !zswap_is_enabled() || !memcg || READ_ONCE(memcg->zswap_writeback);
+	if (!zswap_is_enabled())
+		return true;
+
+	for (; memcg; memcg = parent_mem_cgroup(memcg))
+		if (!READ_ONCE(memcg->zswap_writeback))
+			return false;
+
+	return true;
 }
 
 static u64 zswap_current_read(struct cgroup_subsys_state *css,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c565de8f48e9..91ace8ca97e2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1054,6 +1054,13 @@ __always_inline bool free_pages_prepare(struct page *page,
 		reset_page_owner(page, order);
 		page_table_check_free(page, order);
 		pgalloc_tag_sub(page, 1 << order);
+
+		/*
+		 * The page is isolated and accounted for.
+		 * Mark the codetag as empty to avoid accounting error
+		 * when the page is freed by unpoison_memory().
+		 */
+		clear_page_tag_ref(page);
 		return false;
 	}
 
diff --git a/mm/slub.c b/mm/slub.c
index c9d8a2497fd6..a77f354f8325 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2116,6 +2116,10 @@ alloc_tagging_slab_free_hook(struct kmem_cache *s, struct slab *slab, void **p,
 	if (!mem_alloc_profiling_enabled())
 		return;
 
+	/* slab->obj_exts might not be NULL if it was created for MEMCG accounting. */
+	if (s->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE))
+		return;
+
 	obj_exts = slab_obj_exts(slab);
 	if (!obj_exts)
 		return;
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index e54e5c8907fa..acc56c75ba99 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -787,27 +787,30 @@ retry:
 		}
 
 		dst_pmdval = pmdp_get_lockless(dst_pmd);
-		/*
-		 * If the dst_pmd is mapped as THP don't
-		 * override it and just be strict.
-		 */
-		if (unlikely(pmd_trans_huge(dst_pmdval))) {
-			err = -EEXIST;
-			break;
-		}
 		if (unlikely(pmd_none(dst_pmdval)) &&
 		    unlikely(__pte_alloc(dst_mm, dst_pmd))) {
 			err = -ENOMEM;
 			break;
 		}
-		/* If an huge pmd materialized from under us fail */
-		if (unlikely(pmd_trans_huge(*dst_pmd))) {
+		dst_pmdval = pmdp_get_lockless(dst_pmd);
+		/*
+		 * If the dst_pmd is THP don't override it and just be strict.
+		 * (This includes the case where the PMD used to be THP and
+		 * changed back to none after __pte_alloc().)
+		 */
+		if (unlikely(!pmd_present(dst_pmdval) || pmd_trans_huge(dst_pmdval) ||
+			     pmd_devmap(dst_pmdval))) {
+			err = -EEXIST;
+			break;
+		}
+		if (unlikely(pmd_bad(dst_pmdval))) {
 			err = -EFAULT;
 			break;
 		}
-
-		BUG_ON(pmd_none(*dst_pmd));
-		BUG_ON(pmd_trans_huge(*dst_pmd));
+		/*
+		 * For shmem mappings, khugepaged is allowed to remove page
+		 * tables under us; pte_offset_map_lock() will deal with that.
+		 */
 
 		err = mfill_atomic_pte(dst_pmd, dst_vma, dst_addr,
 				       src_addr, flags, &folio);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index af2de36549d6..a0df1e2e155a 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2191,6 +2191,7 @@ static void purge_vmap_node(struct work_struct *work)
 {
 	struct vmap_node *vn = container_of(work,
 		struct vmap_node, purge_work);
+	unsigned long nr_purged_pages = 0;
 	struct vmap_area *va, *n_va;
 	LIST_HEAD(local_list);
 
@@ -2208,7 +2209,7 @@ static void purge_vmap_node(struct work_struct *work)
 			kasan_release_vmalloc(orig_start, orig_end,
 					      va->va_start, va->va_end);
 
-		atomic_long_sub(nr, &vmap_lazy_nr);
+		nr_purged_pages += nr;
 		vn->nr_purged++;
 
 		if (is_vn_id_valid(vn_id) && !vn->skip_populate)
@@ -2219,6 +2220,8 @@ static void purge_vmap_node(struct work_struct *work)
 		list_add(&va->list, &local_list);
 	}
 
+	atomic_long_sub(nr_purged_pages, &vmap_lazy_nr);
+
 	reclaim_list_global(&local_list);
 }
 
@@ -2626,6 +2629,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
 	vb->dirty_max = 0;
 	bitmap_set(vb->used_map, 0, (1UL << order));
 	INIT_LIST_HEAD(&vb->free_list);
+	vb->cpu = raw_smp_processor_id();
 
 	xa = addr_to_vb_xa(va->va_start);
 	vb_idx = addr_to_vb_idx(va->va_start);
@@ -2642,7 +2646,6 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
 	 * integrity together with list_for_each_rcu from read
 	 * side.
 	 */
-	vb->cpu = raw_smp_processor_id();
 	vbq = per_cpu_ptr(&vmap_block_queue, vb->cpu);
 	spin_lock(&vbq->lock);
 	list_add_tail_rcu(&vb->free_list, &vbq->free);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cfa839284b92..bd489c1af228 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1604,25 +1604,6 @@ static __always_inline void update_lru_sizes(struct lruvec *lruvec,
 
 }
 
-#ifdef CONFIG_CMA
-/*
- * It is waste of effort to scan and reclaim CMA pages if it is not available
- * for current allocation context. Kswapd can not be enrolled as it can not
- * distinguish this scenario by using sc->gfp_mask = GFP_KERNEL
- */
-static bool skip_cma(struct folio *folio, struct scan_control *sc)
-{
-	return !current_is_kswapd() &&
-			gfp_migratetype(sc->gfp_mask) != MIGRATE_MOVABLE &&
-			folio_migratetype(folio) == MIGRATE_CMA;
-}
-#else
-static bool skip_cma(struct folio *folio, struct scan_control *sc)
-{
-	return false;
-}
-#endif
-
 /*
  * Isolating page from the lruvec to fill in @dst list by nr_to_scan times.
  *
@@ -1669,8 +1650,7 @@ static unsigned long isolate_lru_folios(unsigned long nr_to_scan,
 		nr_pages = folio_nr_pages(folio);
 		total_scan += nr_pages;
 
-		if (folio_zonenum(folio) > sc->reclaim_idx ||
-				skip_cma(folio, sc)) {
+		if (folio_zonenum(folio) > sc->reclaim_idx) {
 			nr_skipped[folio_zonenum(folio)] += nr_pages;
 			move_to = &folios_skipped;
 			goto move;
@@ -4320,7 +4300,7 @@ static bool sort_folio(struct lruvec *lruvec, struct folio *folio, struct scan_c
 	}
 
 	/* ineligible */
-	if (zone > sc->reclaim_idx || skip_cma(folio, sc)) {
+	if (zone > sc->reclaim_idx) {
 		gen = folio_inc_gen(lruvec, folio, false);
 		list_move_tail(&folio->lru, &lrugen->folios[gen][type][zone]);
 		return true;
diff --git a/scripts/gfp-translate b/scripts/gfp-translate
index 6c9aed17cf56..8385ae0d5af9 100755
--- a/scripts/gfp-translate
+++ b/scripts/gfp-translate
@@ -62,25 +62,57 @@ if [ "$GFPMASK" = "none" ]; then
 fi
 
 # Extract GFP flags from the kernel source
-TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1
-grep -q ___GFP $SOURCE/include/linux/gfp_types.h
-if [ $? -eq 0 ]; then
-	grep "^#define ___GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
-else
-	grep "^#define __GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)\//) \//' > $TMPFILE
-fi
+TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || exit 1
 
-# Parse the flags
-IFS="
-"
 echo Source: $SOURCE
 echo Parsing: $GFPMASK
-for LINE in `cat $TMPFILE`; do
-	MASK=`echo $LINE | awk '{print $3}'`
-	if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
-		echo $LINE
-	fi
-done
 
-rm -f $TMPFILE
+(
+    cat <<EOF
+#include <stdint.h>
+#include <stdio.h>
+
+// Try to fool compiler.h into not including extra stuff
+#define __ASSEMBLY__	1
+
+#include <generated/autoconf.h>
+#include <linux/gfp_types.h>
+
+static const char *masks[] = {
+EOF
+
+    sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\1/p' $SOURCE/include/linux/gfp_types.h |
+	while read b; do
+	    cat <<EOF
+#if defined($b) && ($b > 0)
+	[${b}_BIT]	= "$b",
+#endif
+EOF
+	done
+
+    cat <<EOF
+};
+
+int main(int argc, char *argv[])
+{
+	unsigned long long mask = $GFPMASK;
+
+	for (int i = 0; i < sizeof(mask) * 8; i++) {
+		unsigned long long bit = 1ULL << i;
+		if (mask & bit)
+			printf("\t%-25s0x%llx\n",
+			       (i < ___GFP_LAST_BIT && masks[i]) ?
+					masks[i] : "*** INVALID ***",
+			       bit);
+	}
+
+	return 0;
+}
+EOF
+) > $TMPFILE
+
+${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin
+
+rm -f $TMPFILE ${TMPFILE}.bin
+
 exit 0
diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
index a818f010de47..bfcea5cf9a48 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -81,17 +81,6 @@ static int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
 	return sret;
 }
 
-static void *sys_mmap(void *addr, unsigned long len, unsigned long prot,
-	unsigned long flags, unsigned long fd, unsigned long offset)
-{
-	void *sret;
-
-	errno = 0;
-	sret = (void *) syscall(__NR_mmap, addr, len, prot,
-		flags, fd, offset);
-	return sret;
-}
-
 static int sys_munmap(void *ptr, size_t size)
 {
 	int sret;
@@ -172,7 +161,7 @@ static void setup_single_address(int size, void **ptrOut)
 {
 	void *ptr;
 
-	ptr = sys_mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
 	*ptrOut = ptr;
 }
 
@@ -181,7 +170,7 @@ static void setup_single_address_rw(int size, void **ptrOut)
 	void *ptr;
 	unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;
 
-	ptr = sys_mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
+	ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
 	*ptrOut = ptr;
 }
 
@@ -205,7 +194,7 @@ bool seal_support(void)
 	void *ptr;
 	unsigned long page_size = getpagesize();
 
-	ptr = sys_mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	ptr = mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
 	if (ptr == (void *) -1)
 		return false;
 
@@ -481,8 +470,8 @@ static void test_seal_zero_address(void)
 	int prot;
 
 	/* use mmap to change protection. */
-	ptr = sys_mmap(0, size, PROT_NONE,
-			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+	ptr = mmap(0, size, PROT_NONE,
+		   MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
 	FAIL_TEST_IF_FALSE(ptr == 0);
 
 	size = get_vma_size(ptr, &prot);
@@ -1209,8 +1198,8 @@ static void test_seal_mmap_overwrite_prot(bool seal)
 	}
 
 	/* use mmap to change protection. */
-	ret2 = sys_mmap(ptr, size, PROT_NONE,
-			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+	ret2 = mmap(ptr, size, PROT_NONE,
+		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
 	if (seal) {
 		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
 		FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1240,8 +1229,8 @@ static void test_seal_mmap_expand(bool seal)
 	}
 
 	/* use mmap to expand. */
-	ret2 = sys_mmap(ptr, size, PROT_READ,
-			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+	ret2 = mmap(ptr, size, PROT_READ,
+		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
 	if (seal) {
 		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
 		FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1268,8 +1257,8 @@ static void test_seal_mmap_shrink(bool seal)
 	}
 
 	/* use mmap to shrink. */
-	ret2 = sys_mmap(ptr, 8 * page_size, PROT_READ,
-			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+	ret2 = mmap(ptr, 8 * page_size, PROT_READ,
+		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
 	if (seal) {
 		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
 		FAIL_TEST_IF_FALSE(errno == EPERM);
@@ -1650,7 +1639,7 @@ static void test_seal_discard_ro_anon_on_filebacked(bool seal)
 	ret = fallocate(fd, 0, 0, size);
 	FAIL_TEST_IF_FALSE(!ret);
 
-	ptr = sys_mmap(NULL, size, PROT_READ, mapflags, fd, 0);
+	ptr = mmap(NULL, size, PROT_READ, mapflags, fd, 0);
 	FAIL_TEST_IF_FALSE(ptr != MAP_FAILED);
 
 	if (seal) {
@@ -1680,7 +1669,7 @@ static void test_seal_discard_ro_anon_on_shared(bool seal)
 	int ret;
 	unsigned long mapflags = MAP_ANONYMOUS | MAP_SHARED;
 
-	ptr = sys_mmap(NULL, size, PROT_READ, mapflags, -1, 0);
+	ptr = mmap(NULL, size, PROT_READ, mapflags, -1, 0);
 	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
 
 	if (seal) {
diff --git a/tools/testing/selftests/mm/seal_elf.c b/tools/testing/selftests/mm/seal_elf.c
index 7aa1366063e4..d9f8ba8d5050 100644
--- a/tools/testing/selftests/mm/seal_elf.c
+++ b/tools/testing/selftests/mm/seal_elf.c
@@ -30,17 +30,6 @@ static int sys_mseal(void *start, size_t len)
 	return sret;
 }
 
-static void *sys_mmap(void *addr, unsigned long len, unsigned long prot,
-	unsigned long flags, unsigned long fd, unsigned long offset)
-{
-	void *sret;
-
-	errno = 0;
-	sret = (void *) syscall(__NR_mmap, addr, len, prot,
-		flags, fd, offset);
-	return sret;
-}
-
 static inline int sys_mprotect(void *ptr, size_t size, unsigned long prot)
 {
 	int sret;
@@ -56,7 +45,7 @@ static bool seal_support(void)
 	void *ptr;
 	unsigned long page_size = getpagesize();
 
-	ptr = sys_mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	ptr = mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
 	if (ptr == (void *) -1)
 		return false;