Merge tag 'mm-hotfixes-stable-2024-01-12-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc hotfixes from Andrew Morton:
 "For once not mostly MM-related.

  17 hotfixes. 10 address post-6.7 issues and the other 7 are cc:stable"

* tag 'mm-hotfixes-stable-2024-01-12-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  userfaultfd: avoid huge_zero_page in UFFDIO_MOVE
  MAINTAINERS: add entry for shrinker
  selftests: mm: hugepage-vmemmap fails on 64K page size systems
  mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval
  mailmap: switch email for Tanzir Hasan
  mailmap: add old address mappings for Randy
  kernel/crash_core.c: make __crash_hotplug_lock static
  efi: disable mirror feature during crashkernel
  kexec: do syscore_shutdown() in kernel_kexec
  mailmap: update entry for Manivannan Sadhasivam
  fs/proc/task_mmu: move mmu notification mechanism inside mm lock
  mm: zswap: switch maintainers to recently active developers and reviewers
  scripts/decode_stacktrace.sh: optionally use LLVM utilities
  kasan: avoid resetting aux_lock
  lib/Kconfig.debug: disable CONFIG_DEBUG_INFO_BTF for Hexagon
  MAINTAINERS: update LTP maintainers
  kdump: defer the insertion of crashkernel resources

Author: torvalds

.mailmap

@@ -363,7 +363,6 @@ Maheshwar Ajja <quic_majja@quicinc.com> <majja@codeaurora.org>
 Malathi Gottam <quic_mgottam@quicinc.com> <mgottam@codeaurora.org>
 Manikanta Pubbisetty <quic_mpubbise@quicinc.com> <mpubbise@codeaurora.org>
 Manivannan Sadhasivam <mani@kernel.org> <manivannanece23@gmail.com>
-Manivannan Sadhasivam <mani@kernel.org> <manivannan.sadhasivam@linaro.org>
 Manoj Basapathi <quic_manojbm@quicinc.com> <manojbm@codeaurora.org>
 Marcin Nowakowski <marcin.nowakowski@mips.com> <marcin.nowakowski@imgtec.com>
 Marc Zyngier <maz@kernel.org> <marc.zyngier@arm.com>
@@ -504,6 +503,9 @@ Ralf Baechle <ralf@linux-mips.org>
 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
 Ram Chandra Jangir <quic_rjangir@quicinc.com> <rjangir@codeaurora.org>
 Randy Dunlap <rdunlap@infradead.org> <rdunlap@xenotime.net>
+Randy Dunlap <rdunlap@infradead.org> <randy.dunlap@oracle.com>
+Randy Dunlap <rdunlap@infradead.org> <rddunlap@osdl.org>
+Randy Dunlap <rdunlap@infradead.org> <randy.dunlap@intel.com>
 Ravi Kumar Bokka <quic_rbokka@quicinc.com> <rbokka@codeaurora.org>
 Ravi Kumar Siddojigari <quic_rsiddoji@quicinc.com> <rsiddoji@codeaurora.org>
 Rémi Denis-Courmont <rdenis@simphalempin.com>
@@ -582,6 +584,7 @@ Surabhi Vishnoi <quic_svishnoi@quicinc.com> <svishnoi@codeaurora.org>
 Takashi YOSHII <takashi.yoshii.zj@renesas.com>
 Tamizh Chelvam Raja <quic_tamizhr@quicinc.com> <tamizhr@codeaurora.org>
 Taniya Das <quic_tdas@quicinc.com> <tdas@codeaurora.org>
+Tanzir Hasan <tanzhasanwork@gmail.com> <tanzirh@google.com>
 Tejun Heo <htejun@gmail.com>
 Tomeu Vizoso <tomeu@tomeuvizoso.net> <tomeu.vizoso@collabora.com>
 Thomas Graf <tgraf@suug.ch>

MAINTAINERS

@@ -12724,12 +12724,11 @@ F:	Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt
 F:	drivers/i2c/muxes/i2c-mux-ltc4306.c
 
 LTP (Linux Test Project)
-M:	Mike Frysinger <vapier@gentoo.org>
 M:	Cyril Hrubis <chrubis@suse.cz>
-M:	Wanlong Gao <wanlong.gao@gmail.com>
 M:	Jan Stancek <jstancek@redhat.com>
-M:	Stanislav Kholmanskikh <stanislav.kholmanskikh@oracle.com>
-M:	Alexey Kodanev <alexey.kodanev@oracle.com>
+M:	Petr Vorel <pvorel@suse.cz>
+M:	Li Wang <liwang@redhat.com>
+M:	Yang Xu <xuyang2018.jy@fujitsu.com>
 L:	ltp@lists.linux.it (subscribers-only)
 S:	Maintained
 W:	http://linux-test-project.github.io/
@@ -19738,6 +19737,19 @@ T:	git git://linuxtv.org/media_tree.git
 F:	drivers/media/i2c/rj54n1cb0c.c
 F:	include/media/i2c/rj54n1cb0c.h
 
+SHRINKER
+M:	Andrew Morton <akpm@linux-foundation.org>
+M:	Dave Chinner <david@fromorbit.com>
+R:	Qi Zheng <zhengqi.arch@bytedance.com>
+R:	Roman Gushchin <roman.gushchin@linux.dev>
+R:	Muchun Song <muchun.song@linux.dev>
+L:	linux-mm@kvack.org
+S:	Maintained
+F:	Documentation/admin-guide/mm/shrinker_debugfs.rst
+F:	include/linux/shrinker.h
+F:	mm/shrinker.c
+F:	mm/shrinker_debug.c
+
 SH_VOU V4L2 OUTPUT DRIVER
 L:	linux-media@vger.kernel.org
 S:	Orphan
@@ -24263,11 +24275,13 @@ N:	zstd
 K:	zstd
 
 ZSWAP COMPRESSED SWAP CACHING
-M:	Seth Jennings <sjenning@redhat.com>
-M:	Dan Streetman <ddstreet@ieee.org>
-M:	Vitaly Wool <vitaly.wool@konsulko.com>
+M:	Johannes Weiner <hannes@cmpxchg.org>
+M:	Yosry Ahmed <yosryahmed@google.com>
+M:	Nhat Pham <nphamcs@gmail.com>
 L:	linux-mm@kvack.org
 S:	Maintained
+F:	Documentation/admin-guide/mm/zswap.rst
+F:	include/linux/zswap.h
 F:	mm/zswap.c
 
 THE REST

fs/proc/task_mmu.c

@@ -2432,7 +2432,6 @@ static long pagemap_scan_flush_buffer(struct pagemap_scan_private *p)
 
 static long do_pagemap_scan(struct mm_struct *mm, unsigned long uarg)
 {
-	struct mmu_notifier_range range;
 	struct pagemap_scan_private p = {0};
 	unsigned long walk_start;
 	size_t n_ranges_out = 0;
@@ -2448,15 +2447,9 @@ static long do_pagemap_scan(struct mm_struct *mm, unsigned long uarg)
 	if (ret)
 		return ret;
 
-	/* Protection change for the range is going to happen. */
-	if (p.arg.flags & PM_SCAN_WP_MATCHING) {
-		mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, 0,
-					mm, p.arg.start, p.arg.end);
-		mmu_notifier_invalidate_range_start(&range);
-	}
-
 	for (walk_start = p.arg.start; walk_start < p.arg.end;
 			walk_start = p.arg.walk_end) {
+		struct mmu_notifier_range range;
 		long n_out;
 
 		if (fatal_signal_pending(current)) {
@@ -2467,8 +2460,20 @@ static long do_pagemap_scan(struct mm_struct *mm, unsigned long uarg)
 		ret = mmap_read_lock_killable(mm);
 		if (ret)
 			break;
+
+		/* Protection change for the range is going to happen. */
+		if (p.arg.flags & PM_SCAN_WP_MATCHING) {
+			mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_VMA, 0,
+						mm, walk_start, p.arg.end);
+			mmu_notifier_invalidate_range_start(&range);
+		}
+
 		ret = walk_page_range(mm, walk_start, p.arg.end,
 				      &pagemap_scan_ops, &p);
+
+		if (p.arg.flags & PM_SCAN_WP_MATCHING)
+			mmu_notifier_invalidate_range_end(&range);
+
 		mmap_read_unlock(mm);
 
 		n_out = pagemap_scan_flush_buffer(&p);
@@ -2494,9 +2499,6 @@ static long do_pagemap_scan(struct mm_struct *mm, unsigned long uarg)
 	if (pagemap_scan_writeback_args(&p.arg, uarg))
 		ret = -EFAULT;
 
-	if (p.arg.flags & PM_SCAN_WP_MATCHING)
-		mmu_notifier_invalidate_range_end(&range);
-
 	kfree(p.vec_buf);
 	return ret;
 }

kernel/crash_core.c

@@ -376,7 +376,6 @@ static int __init reserve_crashkernel_low(unsigned long long low_size)
 
 	crashk_low_res.start = low_base;
 	crashk_low_res.end   = low_base + low_size - 1;
-	insert_resource(&iomem_resource, &crashk_low_res);
 #endif
 	return 0;
 }
@@ -458,8 +457,19 @@ void __init reserve_crashkernel_generic(char *cmdline,
 
 	crashk_res.start = crash_base;
 	crashk_res.end = crash_base + crash_size - 1;
-	insert_resource(&iomem_resource, &crashk_res);
 }
+
+static __init int insert_crashkernel_resources(void)
+{
+	if (crashk_res.start < crashk_res.end)
+		insert_resource(&iomem_resource, &crashk_res);
+
+	if (crashk_low_res.start < crashk_low_res.end)
+		insert_resource(&iomem_resource, &crashk_low_res);
+
+	return 0;
+}
+early_initcall(insert_crashkernel_resources);
 #endif
 
 int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
@@ -867,7 +877,7 @@ subsys_initcall(crash_notes_memory_init);
  * regions are online. So mutex lock  __crash_hotplug_lock is used to
  * serialize the crash hotplug handling specifically.
  */
-DEFINE_MUTEX(__crash_hotplug_lock);
+static DEFINE_MUTEX(__crash_hotplug_lock);
 #define crash_hotplug_lock() mutex_lock(&__crash_hotplug_lock)
 #define crash_hotplug_unlock() mutex_unlock(&__crash_hotplug_lock)
 

kernel/kexec_core.c

@@ -1257,6 +1257,7 @@ int kernel_kexec(void)
 		kexec_in_progress = true;
 		kernel_restart_prepare("kexec reboot");
 		migrate_to_reboot_cpu();
+		syscore_shutdown();
 
 		/*
 		 * migrate_to_reboot_cpu() disables CPU hotplug assuming that

lib/Kconfig.debug

@@ -378,6 +378,8 @@ config DEBUG_INFO_BTF
 	depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
 	depends on BPF_SYSCALL
 	depends on !DEBUG_INFO_DWARF5 || PAHOLE_VERSION >= 121
+	# pahole uses elfutils, which does not have support for Hexagon relocations
+	depends on !HEXAGON
 	help
 	  Generate deduplicated BTF type information from DWARF debug info.
 	  Turning this on expects presence of pahole tool, which will convert

mm/kasan/generic.c

@@ -487,6 +487,7 @@ void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
 		__memset(alloc_meta, 0, sizeof(*alloc_meta));
 
 		/*
+		 * Prepare the lock for saving auxiliary stack traces.
 		 * Temporarily disable KASAN bug reporting to allow instrumented
 		 * raw_spin_lock_init to access aux_lock, which resides inside
 		 * of a redzone.
@@ -510,8 +511,13 @@ static void release_alloc_meta(struct kasan_alloc_meta *meta)
 	stack_depot_put(meta->aux_stack[0]);
 	stack_depot_put(meta->aux_stack[1]);
 
-	/* Zero out alloc meta to mark it as invalid. */
-	__memset(meta, 0, sizeof(*meta));
+	/*
+	 * Zero out alloc meta to mark it as invalid but keep aux_lock
+	 * initialized to avoid having to reinitialize it when another object
+	 * is allocated in the same slot.
+	 */
+	__memset(&meta->alloc_track, 0, sizeof(meta->alloc_track));
+	__memset(meta->aux_stack, 0, sizeof(meta->aux_stack));
 }
 
 static void release_free_meta(const void *object, struct kasan_free_meta *meta)

mm/memory_hotplug.c

@@ -101,9 +101,11 @@ static int set_memmap_mode(const char *val, const struct kernel_param *kp)
 
 static int get_memmap_mode(char *buffer, const struct kernel_param *kp)
 {
-	if (*((int *)kp->arg) == MEMMAP_ON_MEMORY_FORCE)
-		return sprintf(buffer,  "force\n");
-	return param_get_bool(buffer, kp);
+	int mode = *((int *)kp->arg);
+
+	if (mode == MEMMAP_ON_MEMORY_FORCE)
+		return sprintf(buffer, "force\n");
+	return sprintf(buffer, "%c\n", mode ? 'Y' : 'N');
 }
 
 static const struct kernel_param_ops memmap_mode_ops = {

mm/mm_init.c

@@ -26,6 +26,7 @@
 #include <linux/pgtable.h>
 #include <linux/swap.h>
 #include <linux/cma.h>
+#include <linux/crash_dump.h>
 #include "internal.h"
 #include "slab.h"
 #include "shuffle.h"
@@ -381,6 +382,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 			goto out;
 		}
 
+		if (is_kdump_kernel()) {
+			pr_warn("The system is under kdump, ignore kernelcore=mirror.\n");
+			goto out;
+		}
+
 		for_each_mem_region(r) {
 			if (memblock_is_mirror(r))
 				continue;

mm/userfaultfd.c

@@ -1393,6 +1393,12 @@ ssize_t move_pages(struct userfaultfd_ctx *ctx, struct mm_struct *mm,
 				err = -ENOENT;
 				break;
 			}
+			/* Avoid moving zeropages for now */
+			if (is_huge_zero_pmd(*src_pmd)) {
+				spin_unlock(ptl);
+				err = -EBUSY;
+				break;
+			}
 
 			/* Check if we can move the pmd without splitting it. */
 			if (move_splits_huge_pmd(dst_addr, src_addr, src_start + len) ||