Merge tag 'mm-hotfixes-stable-2026-07-20-11-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "12 hotfixes. 8 are cc:stable and the remainder address post-7.1 issues
  or aren't considered appropriate for backporting. 10 are for MM.

  All are singletons - please see the relevant changelogs for details"

* tag 'mm-hotfixes-stable-2026-07-20-11-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mm/memory-failure: trace: change memory_failure_event to ras subsystem
  mm: page_reporting: allow driver to set batch capacity
  mm/kmemleak: fix checksum computation for per-cpu objects
  mm/damon/core: disallow overlapping input ranges for damon_set_regions()
  MAINTAINERS: add Usama as a THP reviewer
  fat: avoid stack overflow warning
  mm/damon/core: validate ranges in damon_set_regions()
  m68k: avoid -Wunused-but-set-parameter in clear_user_page()
  mm/huge_memory: set PG_has_hwpoisoned only after new folio head is established
  mm/page_vma_mapped: fix device-private PMD handling
  MAINTAINERS: s/SeongJae/SJ/
  userfaultfd: prevent registration of special VMAs

Author: torvalds

.mailmap

@@ -817,6 +817,7 @@ Simon Wunderlich <sw@simonwunderlich.de> <simon.wunderlich@s2003.tu-chemnitz.de>
 Simon Wunderlich <sw@simonwunderlich.de> <simon.wunderlich@saxnet.de>
 Simon Wunderlich <sw@simonwunderlich.de> <simon@open-mesh.com>
 Simon Wunderlich <sw@simonwunderlich.de> <siwu@hrz.tu-chemnitz.de>
+SJ Park <sj@kernel.org>
 Sricharan Ramabadhran <quic_srichara@quicinc.com> <sricharan@codeaurora.org>
 Srinivas Kandagatla <srini@kernel.org> <srinivas.kandagatla@st.com>
 Srinivas Kandagatla <srini@kernel.org> <srinivas.kandagatla@linaro.org>

Documentation/ABI/testing/sysfs-kernel-mm-damon

@@ -7125,7 +7125,7 @@ W:	https://docs.dasharo.com/
 F:	drivers/platform/x86/dasharo-acpi.c
 
 DAMON
-M:	SeongJae Park <sj@kernel.org>
+M:	SJ Park <sj@kernel.org>
 L:	damon@lists.linux.dev
 L:	linux-mm@kvack.org
 S:	Maintained
@@ -17257,6 +17257,7 @@ R:	Ryan Roberts <ryan.roberts@arm.com>
 R:	Dev Jain <dev.jain@arm.com>
 R:	Barry Song <baohua@kernel.org>
 R:	Lance Yang <lance.yang@linux.dev>
+R:	Usama Arif <usama.arif@linux.dev>
 L:	linux-mm@kvack.org
 S:	Maintained
 W:	http://www.linux-mm.org

MAINTAINERS

@@ -55,10 +55,12 @@ static inline void clear_page(void *page)
 #define clear_user_page(addr, vaddr, page)	\
 	do {	clear_page(addr);		\
 		flush_dcache_page(page);	\
+		(void)(vaddr);			\
 	} while (0)
 #define copy_user_page(to, from, vaddr, page)	\
 	do {	copy_page(to, from);		\
 		flush_dcache_page(page);	\
+		(void)(vaddr);			\
 	} while (0)
 
 extern unsigned long m68k_memoffset;

arch/m68k/include/asm/page_mm.h

@@ -1017,10 +1017,6 @@ static int virtballoon_probe(struct virtio_device *vdev)
 		unsigned int capacity;
 
 		capacity = virtqueue_get_vring_size(vb->reporting_vq);
-		if (capacity < PAGE_REPORTING_CAPACITY) {
-			err = -ENOSPC;
-			goto out_unregister_oom;
-		}
 
 		vb->pr_dev_info.order = PAGE_REPORTING_ORDER_UNSPECIFIED;
 
@@ -1041,6 +1037,7 @@ static int virtballoon_probe(struct virtio_device *vdev)
 		vb->pr_dev_info.order = 5;
 #endif
 
+		vb->pr_dev_info.capacity = capacity;
 		err = page_reporting_register(&vb->pr_dev_info);
 		if (err)
 			goto out_unregister_oom;

drivers/virtio/virtio_balloon.c

@@ -249,13 +249,13 @@ static inline unsigned char fat_checksum(const __u8 *name)
 	return s;
 }
 
-static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
+static inline sector_t fat_clus_to_blknr(const struct msdos_sb_info *sbi, int clus)
 {
 	return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
 		+ sbi->data_start;
 }
 
-static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi,
+static inline void fat_get_blknr_offset(const struct msdos_sb_info *sbi,
 				loff_t i_pos, sector_t *blknr, int *offset)
 {
 	*blknr = i_pos >> sbi->dir_per_block_bits;

fs/fat/fat.h

@@ -22,7 +22,7 @@ static void fat_checksum_test(struct kunit *test)
 
 static void fat_clus_to_blknr_test(struct kunit *test)
 {
-	struct msdos_sb_info sbi = {
+	static const struct msdos_sb_info sbi = {
 		.sec_per_clus = 4,
 		.data_start = 100,
 	};
@@ -34,7 +34,7 @@ static void fat_clus_to_blknr_test(struct kunit *test)
 
 static void fat_get_blknr_offset_test(struct kunit *test)
 {
-	struct msdos_sb_info sbi = {
+	static const struct msdos_sb_info sbi = {
 		.dir_per_block = 16,
 		.dir_per_block_bits = 4,
 	};

fs/fat/fat_test.c

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * DAMON api
- *
- * Author: SeongJae Park <sj@kernel.org>
  */
 
 #ifndef _DAMON_H_

include/linux/damon.h

@@ -5,7 +5,6 @@
 #include <linux/mmzone.h>
 #include <linux/scatterlist.h>
 
-/* This value should always be a power of 2, see page_reporting_cycle() */
 #define PAGE_REPORTING_CAPACITY		32
 #define PAGE_REPORTING_ORDER_UNSPECIFIED	-1
 
@@ -22,6 +21,9 @@ struct page_reporting_dev_info {
 
 	/* Minimal order of page reporting */
 	unsigned int order;
+
+	/* Max pages per report batch; 0 (default) means PAGE_REPORTING_CAPACITY */
+	unsigned int capacity;
 };
 
 /* Tear-down and bring-up for page reporting devices */

include/linux/page_reporting.h

@@ -1,6 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #undef TRACE_SYSTEM
-#define TRACE_SYSTEM memory_failure
+/*
+ * For historical versions, memory_failure_event is in ras subsystem,
+ * some user programs depend on it.
+ */
+#define TRACE_SYSTEM ras
 #define TRACE_INCLUDE_FILE memory-failure
 
 #if !defined(_TRACE_MEMORY_FAILURE_H) || defined(TRACE_HEADER_MULTI_READ)