Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "14 patches.

  Subsystems affected by this patch series: MAINTAINERS, binfmt, and
  mm (tmpfs, secretmem, kasan, kfence, pagealloc, zram, compaction,
  hugetlb, vmalloc, and kmemleak)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: kmemleak: take a full lowmem check in kmemleak_*_phys()
  mm/vmalloc: fix spinning drain_vmap_work after reading from /proc/vmcore
  revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"
  revert "fs/binfmt_elf: fix PT_LOAD p_align values for loaders"
  hugetlb: do not demote poisoned hugetlb pages
  mm: compaction: fix compiler warning when CONFIG_COMPACTION=n
  mm: fix unexpected zeroed page mapping with zram swap
  mm, page_alloc: fix build_zonerefs_node()
  mm, kfence: support kmem_dump_obj() for KFENCE objects
  kasan: fix hw tags enablement when KUNIT tests are disabled
  irq_work: use kasan_record_aux_stack_noalloc() record callstack
  mm/secretmem: fix panic when growing a memfd_secret
  tmpfs: fix regressions from wider use of ZERO_PAGE
  MAINTAINERS: Broadcom internal lists aren't maintainers

25 files changed, 206 insertions, 168 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 7341667e7313..d76c9aa1d38a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3743,7 +3743,7 @@ F:	include/linux/platform_data/b53.h
 
 BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE
 M:	Nicolas Saenz Julienne <nsaenz@kernel.org>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-rpi-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
@@ -3758,7 +3758,7 @@ BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
 M:	Ray Jui <rjui@broadcom.com>
 M:	Scott Branden <sbranden@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Maintained
 T:	git git://github.com/broadcom/mach-bcm
 F:	arch/arm/mach-bcm/
@@ -3778,7 +3778,7 @@ F:	arch/mips/include/asm/mach-bcm47xx/*
 
 BROADCOM BCM4908 ETHERNET DRIVER
 M:	Rafał Miłecki <rafal@milecki.pl>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/brcm,bcm4908-enet.yaml
@@ -3787,7 +3787,7 @@ F:	drivers/net/ethernet/broadcom/unimac.h
 
 BROADCOM BCM4908 PINMUX DRIVER
 M:	Rafał Miłecki <rafal@milecki.pl>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-gpio@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/brcm,bcm4908-pinctrl.yaml
@@ -3797,7 +3797,7 @@ BROADCOM BCM5301X ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
 M:	Hauke Mehrtens <hauke@hauke-m.de>
 M:	Rafał Miłecki <zajec5@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/boot/dts/bcm470*
@@ -3808,7 +3808,7 @@ F:	arch/arm/mach-bcm/bcm_5301x.c
 BROADCOM BCM53573 ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
 M:	Rafał Miłecki <rafal@milecki.pl>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/boot/dts/bcm47189*
@@ -3816,7 +3816,7 @@ F:	arch/arm/boot/dts/bcm53573*
 
 BROADCOM BCM63XX ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 T:	git git://github.com/broadcom/stblinux.git
@@ -3830,7 +3830,7 @@ F:	drivers/usb/gadget/udc/bcm63xx_udc.*
 
 BROADCOM BCM7XXX ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 T:	git git://github.com/broadcom/stblinux.git
@@ -3848,21 +3848,21 @@ N:	bcm7120
 BROADCOM BDC DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
 L:	linux-usb@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/usb/brcm,bdc.yaml
 F:	drivers/usb/gadget/udc/bdc/
 
 BROADCOM BMIPS CPUFREQ DRIVER
 M:	Markus Mayer <mmayer@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 F:	drivers/cpufreq/bmips-cpufreq.c
 
 BROADCOM BMIPS MIPS ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-mips@vger.kernel.org
 S:	Maintained
 T:	git git://github.com/broadcom/stblinux.git
@@ -3928,53 +3928,53 @@ F:	drivers/net/wireless/broadcom/brcm80211/
 BROADCOM BRCMSTB GPIO DRIVER
 M:	Doug Berger <opendmb@gmail.com>
 M:	Florian Fainelli <f.fainelli@gmail.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Supported
 F:	Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.yaml
 F:	drivers/gpio/gpio-brcmstb.c
 
 BROADCOM BRCMSTB I2C DRIVER
 M:	Kamal Dasu <kdasu.kdev@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-i2c@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Supported
 F:	Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml
 F:	drivers/i2c/busses/i2c-brcmstb.c
 
 BROADCOM BRCMSTB UART DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-serial@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	Documentation/devicetree/bindings/serial/brcm,bcm7271-uart.yaml
 F:	drivers/tty/serial/8250/8250_bcm7271.c
 
 BROADCOM BRCMSTB USB EHCI DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-usb@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	Documentation/devicetree/bindings/usb/brcm,bcm7445-ehci.yaml
 F:	drivers/usb/host/ehci-brcm.*
 
 BROADCOM BRCMSTB USB PIN MAP DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-usb@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
 F:	drivers/usb/misc/brcmstb-usb-pinmap.c
 
 BROADCOM BRCMSTB USB2 and USB3 PHY DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-kernel@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	drivers/phy/broadcom/phy-brcm-usb*
 
 BROADCOM ETHERNET PHY DRIVERS
 M:	Florian Fainelli <f.fainelli@gmail.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	netdev@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/net/broadcom-bcm87xx.txt
@@ -3985,7 +3985,7 @@ F:	include/linux/brcmphy.h
 BROADCOM GENET ETHERNET DRIVER
 M:	Doug Berger <opendmb@gmail.com>
 M:	Florian Fainelli <f.fainelli@gmail.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	netdev@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/net/brcm,bcmgenet.yaml
@@ -3999,7 +3999,7 @@ F:	include/linux/platform_data/mdio-bcm-unimac.h
 BROADCOM IPROC ARM ARCHITECTURE
 M:	Ray Jui <rjui@broadcom.com>
 M:	Scott Branden <sbranden@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 T:	git git://github.com/broadcom/stblinux.git
@@ -4027,7 +4027,7 @@ N:	stingray
 
 BROADCOM IPROC GBIT ETHERNET DRIVER
 M:	Rafał Miłecki <rafal@milecki.pl>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/brcm,amac.yaml
@@ -4036,7 +4036,7 @@ F:	drivers/net/ethernet/broadcom/unimac.h
 
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Supported
 F:	Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt
 F:	drivers/gpio/gpio-bcm-kona.c
@@ -4069,7 +4069,7 @@ F:	drivers/firmware/broadcom/*
 BROADCOM PMB (POWER MANAGEMENT BUS) DRIVER
 M:	Rafał Miłecki <rafal@milecki.pl>
 M:	Florian Fainelli <f.fainelli@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 T:	git git://github.com/broadcom/stblinux.git
@@ -4085,7 +4085,7 @@ F:	include/linux/bcma/
 
 BROADCOM SPI DRIVER
 M:	Kamal Dasu <kdasu.kdev@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/spi/brcm,spi-bcm-qspi.yaml
 F:	drivers/spi/spi-bcm-qspi.*
@@ -4094,7 +4094,7 @@ F:	drivers/spi/spi-iproc-qspi.c
 
 BROADCOM STB AVS CPUFREQ DRIVER
 M:	Markus Mayer <mmayer@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt
@@ -4102,7 +4102,7 @@ F:	drivers/cpufreq/brcmstb*
 
 BROADCOM STB AVS TMON DRIVER
 M:	Markus Mayer <mmayer@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/thermal/brcm,avs-tmon.yaml
@@ -4110,7 +4110,7 @@ F:	drivers/thermal/broadcom/brcmstb*
 
 BROADCOM STB DPFE DRIVER
 M:	Markus Mayer <mmayer@broadcom.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.yaml
@@ -4119,8 +4119,8 @@ F:	drivers/memory/brcmstb_dpfe.c
 BROADCOM STB NAND FLASH DRIVER
 M:	Brian Norris <computersforpeace@gmail.com>
 M:	Kamal Dasu <kdasu.kdev@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-mtd@lists.infradead.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	drivers/mtd/nand/raw/brcmnand/
 F:	include/linux/platform_data/brcmnand.h
@@ -4129,7 +4129,7 @@ BROADCOM STB PCIE DRIVER
 M:	Jim Quinlan <jim2101024@gmail.com>
 M:	Nicolas Saenz Julienne <nsaenz@kernel.org>
 M:	Florian Fainelli <f.fainelli@gmail.com>
-M:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-pci@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
@@ -4137,7 +4137,7 @@ F:	drivers/pci/controller/pcie-brcmstb.c
 
 BROADCOM SYSTEMPORT ETHERNET DRIVER
 M:	Florian Fainelli <f.fainelli@gmail.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	netdev@vger.kernel.org
 S:	Supported
 F:	drivers/net/ethernet/broadcom/bcmsysport.*
@@ -4154,7 +4154,7 @@ F:	drivers/net/ethernet/broadcom/tg3.*
 
 BROADCOM VK DRIVER
 M:	Scott Branden <scott.branden@broadcom.com>
-L:	bcm-kernel-feedback-list@broadcom.com
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 S:	Supported
 F:	drivers/misc/bcm-vk/
 F:	include/uapi/linux/misc/bcm_vk.h
@@ -17648,8 +17648,8 @@ K:	\bTIF_SECCOMP\b
 
 SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) Broadcom BRCMSTB DRIVER
 M:	Al Cooper <alcooperx@gmail.com>
+R:	Broadcom Kernel Team <bcm-kernel-feedback-list@broadcom.com>
 L:	linux-mmc@vger.kernel.org
-L:	bcm-kernel-feedback-list@broadcom.com
 S:	Maintained
 F:	drivers/mmc/host/sdhci-brcmstb*
 
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index f6d91ecb8026..e9736af126b2 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -210,8 +210,6 @@ void __iomem *ioremap(resource_size_t offset, unsigned long size);
 extern void iounmap(volatile void __iomem *addr);
 #define iounmap iounmap
 
-extern void set_iounmap_nonlazy(void);
-
 #ifdef __KERNEL__
 
 void memcpy_fromio(void *, const volatile void __iomem *, size_t);
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index a7f617a3981d..97529552dd24 100644
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -37,7 +37,6 @@ static ssize_t __copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
 	} else
 		memcpy(buf, vaddr + offset, csize);
 
-	set_iounmap_nonlazy();
 	iounmap((void __iomem *)vaddr);
 	return csize;
 }
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 6556e13ed95f..63c7ebb0da89 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1117,11 +1117,11 @@ out_free_interp:
 			 * independently randomized mmap region (0 load_bias
 			 * without MAP_FIXED nor MAP_FIXED_NOREPLACE).
 			 */
-			alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
-			if (interpreter || alignment > ELF_MIN_ALIGN) {
+			if (interpreter) {
 				load_bias = ELF_ET_DYN_BASE;
 				if (current->flags & PF_RANDOMIZE)
 					load_bias += arch_mmap_rnd();
+				alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
 				if (alignment)
 					load_bias &= ~(alignment - 1);
 				elf_flags |= MAP_FIXED_NOREPLACE;
diff --git a/include/linux/kfence.h b/include/linux/kfence.h
index f49e64222628..726857a4b680 100644
--- a/include/linux/kfence.h
+++ b/include/linux/kfence.h
@@ -204,6 +204,22 @@ static __always_inline __must_check bool kfence_free(void *addr)
  */
 bool __must_check kfence_handle_page_fault(unsigned long addr, bool is_write, struct pt_regs *regs);
 
+#ifdef CONFIG_PRINTK
+struct kmem_obj_info;
+/**
+ * __kfence_obj_info() - fill kmem_obj_info struct
+ * @kpp: kmem_obj_info to be filled
+ * @object: the object
+ *
+ * Return:
+ * * false - not a KFENCE object
+ * * true - a KFENCE object, filled @kpp
+ *
+ * Copies information to @kpp for KFENCE objects.
+ */
+bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
+#endif
+
 #else /* CONFIG_KFENCE */
 
 static inline bool is_kfence_address(const void *addr) { return false; }
@@ -221,6 +237,14 @@ static inline bool __must_check kfence_handle_page_fault(unsigned long addr, boo
 	return false;
 }
 
+#ifdef CONFIG_PRINTK
+struct kmem_obj_info;
+static inline bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+{
+	return false;
+}
+#endif
+
 #endif
 
 #endif /* _LINUX_KFENCE_H */
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index f7df715ec28e..7afa40fe5cc4 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -137,7 +137,7 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
 	if (!irq_work_claim(work))
 		return false;
 
-	kasan_record_aux_stack(work);
+	kasan_record_aux_stack_noalloc(work);
 
 	preempt_disable();
 	if (cpu != smp_processor_id()) {
diff --git a/mm/compaction.c b/mm/compaction.c
index c3e37aa9ff9e..fe915db6149b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -26,6 +26,11 @@
 #include "internal.h"
 
 #ifdef CONFIG_COMPACTION
+/*
+ * Fragmentation score check interval for proactive compaction purposes.
+ */
+#define HPAGE_FRAG_CHECK_INTERVAL_MSEC	(500)
+
 static inline void count_compact_event(enum vm_event_item item)
 {
 	count_vm_event(item);
@@ -51,11 +56,6 @@ static inline void count_compact_events(enum vm_event_item item, long delta)
 #define pageblock_end_pfn(pfn)		block_end_pfn(pfn, pageblock_order)
 
 /*
- * Fragmentation score check interval for proactive compaction purposes.
- */
-static const unsigned int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
-
-/*
  * Page order with-respect-to which proactive compaction
  * calculates external fragmentation, which is used as
  * the "fragmentation score" of a node/zone.
diff --git a/mm/filemap.c b/mm/filemap.c
index 3a5ffb5587cd..9a1eef6c5d35 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1063,12 +1063,6 @@ void __init pagecache_init(void)
 		init_waitqueue_head(&folio_wait_table[i]);
 
 	page_writeback_init();
-
-	/*
-	 * tmpfs uses the ZERO_PAGE for reading holes: it is up-to-date,
-	 * and splice's page_cache_pipe_buf_confirm() needs to see that.
-	 */
-	SetPageUptodate(ZERO_PAGE(0));
 }
 
 /*
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index b34f50156f7e..f8ca7cca3c1a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3475,7 +3475,6 @@ static int demote_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
 {
 	int nr_nodes, node;
 	struct page *page;
-	int rc = 0;
 
 	lockdep_assert_held(&hugetlb_lock);
 
@@ -3486,15 +3485,19 @@ static int demote_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
 	}
 
 	for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
-		if (!list_empty(&h->hugepage_freelists[node])) {
-			page = list_entry(h->hugepage_freelists[node].next,
-					struct page, lru);
-			rc = demote_free_huge_page(h, page);
-			break;
+		list_for_each_entry(page, &h->hugepage_freelists[node], lru) {
+			if (PageHWPoison(page))
+				continue;
+
+			return demote_free_huge_page(h, page);
 		}
 	}
 
-	return rc;
+	/*
+	 * Only way to get here is if all pages on free lists are poisoned.
+	 * Return -EBUSY so that caller will not retry.
+	 */
+	return -EBUSY;
 }
 
 #define HSTATE_ATTR_RO(_name) \
diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index 07a76c46daa5..9e1b6544bfa8 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -336,8 +336,6 @@ void __kasan_poison_vmalloc(const void *start, unsigned long size)
 
 #endif
 
-#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
-
 void kasan_enable_tagging(void)
 {
 	if (kasan_arg_mode == KASAN_ARG_MODE_ASYNC)
@@ -347,6 +345,9 @@ void kasan_enable_tagging(void)
 	else
 		hw_enable_tagging_sync();
 }
+
+#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
+
 EXPORT_SYMBOL_GPL(kasan_enable_tagging);
 
 void kasan_force_async_fault(void)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index d79b83d673b1..b01b4bbe0409 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -355,25 +355,27 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
 #define hw_set_mem_tag_range(addr, size, tag, init) \
 			arch_set_mem_tag_range((addr), (size), (tag), (init))
 
+void kasan_enable_tagging(void);
+
 #else /* CONFIG_KASAN_HW_TAGS */
 
 #define hw_enable_tagging_sync()
 #define hw_enable_tagging_async()
 #define hw_enable_tagging_asymm()
 
+static inline void kasan_enable_tagging(void) { }
+
 #endif /* CONFIG_KASAN_HW_TAGS */
 
 #if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
 
-void kasan_enable_tagging(void);
 void kasan_force_async_fault(void);
 
-#else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
+#else /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */
 
-static inline void kasan_enable_tagging(void) { }
 static inline void kasan_force_async_fault(void) { }
 
-#endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
+#endif /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */
 
 #ifdef CONFIG_KASAN_SW_TAGS
 u8 kasan_random_tag(void);
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index a203747ad2c0..9b2b5f56f4ae 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -231,27 +231,6 @@ static bool kfence_unprotect(unsigned long addr)
 	return !KFENCE_WARN_ON(!kfence_protect_page(ALIGN_DOWN(addr, PAGE_SIZE), false));
 }
 
-static inline struct kfence_metadata *addr_to_metadata(unsigned long addr)
-{
-	long index;
-
-	/* The checks do not affect performance; only called from slow-paths. */
-
-	if (!is_kfence_address((void *)addr))
-		return NULL;
-
-	/*
-	 * May be an invalid index if called with an address at the edge of
-	 * __kfence_pool, in which case we would report an "invalid access"
-	 * error.
-	 */
-	index = (addr - (unsigned long)__kfence_pool) / (PAGE_SIZE * 2) - 1;
-	if (index < 0 || index >= CONFIG_KFENCE_NUM_OBJECTS)
-		return NULL;
-
-	return &kfence_metadata[index];
-}
-
 static inline unsigned long metadata_to_pageaddr(const struct kfence_metadata *meta)
 {
 	unsigned long offset = (meta - kfence_metadata + 1) * PAGE_SIZE * 2;
diff --git a/mm/kfence/kfence.h b/mm/kfence/kfence.h
index 9a6c4b1b12a8..600f2e2431d6 100644
--- a/mm/kfence/kfence.h
+++ b/mm/kfence/kfence.h
@@ -96,6 +96,27 @@ struct kfence_metadata {
 
 extern struct kfence_metadata kfence_metadata[CONFIG_KFENCE_NUM_OBJECTS];
 
+static inline struct kfence_metadata *addr_to_metadata(unsigned long addr)
+{
+	long index;
+
+	/* The checks do not affect performance; only called from slow-paths. */
+
+	if (!is_kfence_address((void *)addr))
+		return NULL;
+
+	/*
+	 * May be an invalid index if called with an address at the edge of
+	 * __kfence_pool, in which case we would report an "invalid access"
+	 * error.
+	 */
+	index = (addr - (unsigned long)__kfence_pool) / (PAGE_SIZE * 2) - 1;
+	if (index < 0 || index >= CONFIG_KFENCE_NUM_OBJECTS)
+		return NULL;
+
+	return &kfence_metadata[index];
+}
+
 /* KFENCE error types for report generation. */
 enum kfence_error_type {
 	KFENCE_ERROR_OOB,		/* Detected a out-of-bounds access. */
diff --git a/mm/kfence/report.c b/mm/kfence/report.c
index f93a7b2a338b..f5a6d8ba3e21 100644
--- a/mm/kfence/report.c
+++ b/mm/kfence/report.c
@@ -273,3 +273,50 @@ void kfence_report_error(unsigned long address, bool is_write, struct pt_regs *r
 	/* We encountered a memory safety error, taint the kernel! */
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_STILL_OK);
 }
+
+#ifdef CONFIG_PRINTK
+static void kfence_to_kp_stack(const struct kfence_track *track, void **kp_stack)
+{
+	int i, j;
+
+	i = get_stack_skipnr(track->stack_entries, track->num_stack_entries, NULL);
+	for (j = 0; i < track->num_stack_entries && j < KS_ADDRS_COUNT; ++i, ++j)
+		kp_stack[j] = (void *)track->stack_entries[i];
+	if (j < KS_ADDRS_COUNT)
+		kp_stack[j] = NULL;
+}
+
+bool __kfence_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+{
+	struct kfence_metadata *meta = addr_to_metadata((unsigned long)object);
+	unsigned long flags;
+
+	if (!meta)
+		return false;
+
+	/*
+	 * If state is UNUSED at least show the pointer requested; the rest
+	 * would be garbage data.
+	 */
+	kpp->kp_ptr = object;
+
+	/* Requesting info an a never-used object is almost certainly a bug. */
+	if (WARN_ON(meta->state == KFENCE_OBJECT_UNUSED))
+		return true;
+
+	raw_spin_lock_irqsave(&meta->lock, flags);
+
+	kpp->kp_slab = slab;
+	kpp->kp_slab_cache = meta->cache;
+	kpp->kp_objp = (void *)meta->addr;
+	kfence_to_kp_stack(&meta->alloc_track, kpp->kp_stack);
+	if (meta->state == KFENCE_OBJECT_FREED)
+		kfence_to_kp_stack(&meta->free_track, kpp->kp_free_stack);
+	/* get_stack_skipnr() ensures the first entry is outside allocator. */
+	kpp->kp_ret = kpp->kp_stack[0];
+
+	raw_spin_unlock_irqrestore(&meta->lock, flags);
+
+	return true;
+}
+#endif
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index acd7cbb82e16..a182f5ddaf68 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1132,7 +1132,7 @@ EXPORT_SYMBOL(kmemleak_no_scan);
 void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
 			       gfp_t gfp)
 {
-	if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
 		kmemleak_alloc(__va(phys), size, min_count, gfp);
 }
 EXPORT_SYMBOL(kmemleak_alloc_phys);
@@ -1146,7 +1146,7 @@ EXPORT_SYMBOL(kmemleak_alloc_phys);
  */
 void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size)
 {
-	if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
 		kmemleak_free_part(__va(phys), size);
 }
 EXPORT_SYMBOL(kmemleak_free_part_phys);
@@ -1158,7 +1158,7 @@ EXPORT_SYMBOL(kmemleak_free_part_phys);
  */
 void __ref kmemleak_not_leak_phys(phys_addr_t phys)
 {
-	if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
 		kmemleak_not_leak(__va(phys));
 }
 EXPORT_SYMBOL(kmemleak_not_leak_phys);
@@ -1170,7 +1170,7 @@ EXPORT_SYMBOL(kmemleak_not_leak_phys);
  */
 void __ref kmemleak_ignore_phys(phys_addr_t phys)
 {
-	if (!IS_ENABLED(CONFIG_HIGHMEM) || PHYS_PFN(phys) < max_low_pfn)
+	if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
 		kmemleak_ignore(__va(phys));
 }
 EXPORT_SYMBOL(kmemleak_ignore_phys);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6e5b4488a0c5..33ca8cab21e6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6131,7 +6131,7 @@ static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs)
 	do {
 		zone_type--;
 		zone = pgdat->node_zones + zone_type;
-		if (managed_zone(zone)) {
+		if (populated_zone(zone)) {
 			zoneref_set_zone(zone, &zonerefs[nr_zones++]);
 			check_highest_zone(zone_type);
 		}
diff --git a/mm/page_io.c b/mm/page_io.c
index b417f000b49e..89fbf3cae30f 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -51,54 +51,6 @@ void end_swap_bio_write(struct bio *bio)
 	bio_put(bio);
 }
 
-static void swap_slot_free_notify(struct page *page)
-{
-	struct swap_info_struct *sis;
-	struct gendisk *disk;
-	swp_entry_t entry;
-
-	/*
-	 * There is no guarantee that the page is in swap cache - the software
-	 * suspend code (at least) uses end_swap_bio_read() against a non-
-	 * swapcache page.  So we must check PG_swapcache before proceeding with
-	 * this optimization.
-	 */
-	if (unlikely(!PageSwapCache(page)))
-		return;
-
-	sis = page_swap_info(page);
-	if (data_race(!(sis->flags & SWP_BLKDEV)))
-		return;
-
-	/*
-	 * The swap subsystem performs lazy swap slot freeing,
-	 * expecting that the page will be swapped out again.
-	 * So we can avoid an unnecessary write if the page
-	 * isn't redirtied.
-	 * This is good for real swap storage because we can
-	 * reduce unnecessary I/O and enhance wear-leveling
-	 * if an SSD is used as the as swap device.
-	 * But if in-memory swap device (eg zram) is used,
-	 * this causes a duplicated copy between uncompressed
-	 * data in VM-owned memory and compressed data in
-	 * zram-owned memory.  So let's free zram-owned memory
-	 * and make the VM-owned decompressed page *dirty*,
-	 * so the page should be swapped out somewhere again if
-	 * we again wish to reclaim it.
-	 */
-	disk = sis->bdev->bd_disk;
-	entry.val = page_private(page);
-	if (disk->fops->swap_slot_free_notify && __swap_count(entry) == 1) {
-		unsigned long offset;
-
-		offset = swp_offset(entry);
-
-		SetPageDirty(page);
-		disk->fops->swap_slot_free_notify(sis->bdev,
-				offset);
-	}
-}
-
 static void end_swap_bio_read(struct bio *bio)
 {
 	struct page *page = bio_first_page_all(bio);
@@ -114,7 +66,6 @@ static void end_swap_bio_read(struct bio *bio)
 	}
 
 	SetPageUptodate(page);
-	swap_slot_free_notify(page);
 out:
 	unlock_page(page);
 	WRITE_ONCE(bio->bi_private, NULL);
@@ -394,11 +345,6 @@ int swap_readpage(struct page *page, bool synchronous)
 	if (sis->flags & SWP_SYNCHRONOUS_IO) {
 		ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
 		if (!ret) {
-			if (trylock_page(page)) {
-				swap_slot_free_notify(page);
-				unlock_page(page);
-			}
-
 			count_vm_event(PSWPIN);
 			goto out;
 		}
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 098638d3b8a4..3b3cf2892b6a 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -158,6 +158,22 @@ const struct address_space_operations secretmem_aops = {
 	.isolate_page	= secretmem_isolate_page,
 };
 
+static int secretmem_setattr(struct user_namespace *mnt_userns,
+			     struct dentry *dentry, struct iattr *iattr)
+{
+	struct inode *inode = d_inode(dentry);
+	unsigned int ia_valid = iattr->ia_valid;
+
+	if ((ia_valid & ATTR_SIZE) && inode->i_size)
+		return -EINVAL;
+
+	return simple_setattr(mnt_userns, dentry, iattr);
+}
+
+static const struct inode_operations secretmem_iops = {
+	.setattr = secretmem_setattr,
+};
+
 static struct vfsmount *secretmem_mnt;
 
 static struct file *secretmem_file_create(unsigned long flags)
@@ -177,6 +193,7 @@ static struct file *secretmem_file_create(unsigned long flags)
 	mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
 	mapping_set_unevictable(inode->i_mapping);
 
+	inode->i_op = &secretmem_iops;
 	inode->i_mapping->a_ops = &secretmem_aops;
 
 	/* pretend we are a normal file with zero size */
diff --git a/mm/shmem.c b/mm/shmem.c
index 529c9ad3e926..4b2fea33158e 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2513,7 +2513,6 @@ static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 		pgoff_t end_index;
 		unsigned long nr, ret;
 		loff_t i_size = i_size_read(inode);
-		bool got_page;
 
 		end_index = i_size >> PAGE_SHIFT;
 		if (index > end_index)
@@ -2570,24 +2569,34 @@ static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 			 */
 			if (!offset)
 				mark_page_accessed(page);
-			got_page = true;
+			/*
+			 * Ok, we have the page, and it's up-to-date, so
+			 * now we can copy it to user space...
+			 */
+			ret = copy_page_to_iter(page, offset, nr, to);
+			put_page(page);
+
+		} else if (iter_is_iovec(to)) {
+			/*
+			 * Copy to user tends to be so well optimized, but
+			 * clear_user() not so much, that it is noticeably
+			 * faster to copy the zero page instead of clearing.
+			 */
+			ret = copy_page_to_iter(ZERO_PAGE(0), offset, nr, to);
 		} else {
-			page = ZERO_PAGE(0);
-			got_page = false;
+			/*
+			 * But submitting the same page twice in a row to
+			 * splice() - or others? - can result in confusion:
+			 * so don't attempt that optimization on pipes etc.
+			 */
+			ret = iov_iter_zero(nr, to);
 		}
 
-		/*
-		 * Ok, we have the page, and it's up-to-date, so
-		 * now we can copy it to user space...
-		 */
-		ret = copy_page_to_iter(page, offset, nr, to);
 		retval += ret;
 		offset += ret;
 		index += offset >> PAGE_SHIFT;
 		offset &= ~PAGE_MASK;
 
-		if (got_page)
-			put_page(page);
 		if (!iov_iter_count(to))
 			break;
 		if (ret < nr) {
diff --git a/mm/slab.c b/mm/slab.c
index b04e40078bdf..0edb474edef1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3665,7 +3665,7 @@ EXPORT_SYMBOL(__kmalloc_node_track_caller);
 #endif /* CONFIG_NUMA */
 
 #ifdef CONFIG_PRINTK
-void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
 {
 	struct kmem_cache *cachep;
 	unsigned int objnr;
diff --git a/mm/slab.h b/mm/slab.h
index fd7ae2024897..95eb34174c1b 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -868,7 +868,7 @@ struct kmem_obj_info {
 	void *kp_stack[KS_ADDRS_COUNT];
 	void *kp_free_stack[KS_ADDRS_COUNT];
 };
-void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
+void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
 #endif
 
 #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 6ee64d6208b3..2b3206a2c3b5 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -555,6 +555,13 @@ bool kmem_valid_obj(void *object)
 }
 EXPORT_SYMBOL_GPL(kmem_valid_obj);
 
+static void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+{
+	if (__kfence_obj_info(kpp, object, slab))
+		return;
+	__kmem_obj_info(kpp, object, slab);
+}
+
 /**
  * kmem_dump_obj - Print available slab provenance information
  * @object: slab object for which to find provenance information.
@@ -590,6 +597,8 @@ void kmem_dump_obj(void *object)
 		pr_cont(" slab%s %s", cp, kp.kp_slab_cache->name);
 	else
 		pr_cont(" slab%s", cp);
+	if (is_kfence_address(object))
+		pr_cont(" (kfence)");
 	if (kp.kp_objp)
 		pr_cont(" start %px", kp.kp_objp);
 	if (kp.kp_data_offset)
diff --git a/mm/slob.c b/mm/slob.c
index dfa6808dff36..40ea6e2d4ccd 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -463,7 +463,7 @@ out:
 }
 
 #ifdef CONFIG_PRINTK
-void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
 {
 	kpp->kp_ptr = object;
 	kpp->kp_slab = slab;
diff --git a/mm/slub.c b/mm/slub.c
index 74d92aa4a3a2..ed5c2c03a47a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4312,7 +4312,7 @@ int __kmem_cache_shutdown(struct kmem_cache *s)
 }
 
 #ifdef CONFIG_PRINTK
-void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
+void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
 {
 	void *base;
 	int __maybe_unused i;
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e163372d3967..0b17498a34f1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1671,17 +1671,6 @@ static DEFINE_MUTEX(vmap_purge_lock);
 /* for per-CPU blocks */
 static void purge_fragmented_blocks_allcpus(void);
 
-#ifdef CONFIG_X86_64
-/*
- * called before a call to iounmap() if the caller wants vm_area_struct's
- * immediately freed.
- */
-void set_iounmap_nonlazy(void)
-{
-	atomic_long_set(&vmap_lazy_nr, lazy_max_pages()+1);
-}
-#endif /* CONFIG_X86_64 */
-
 /*
  * Purges all lazily-freed vmap areas.
  */