Merge branch 'akpm' (patches from Andrew)

Pull yet more updates from Andrew Morton:
 "54 patches.

  Subsystems affected by this patch series: lib, mm (slub, secretmem,
  cleanups, init, pagemap, and mremap), and debug"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (54 commits)
  powerpc/mm: enable HAVE_MOVE_PMD support
  powerpc/book3s64/mm: update flush_tlb_range to flush page walk cache
  mm/mremap: allow arch runtime override
  mm/mremap: hold the rmap lock in write mode when moving page table entries.
  mm/mremap: use pmd/pud_poplulate to update page table entries
  mm/mremap: don't enable optimized PUD move if page table levels is 2
  mm/mremap: convert huge PUD move to separate helper
  selftest/mremap_test: avoid crash with static build
  selftest/mremap_test: update the test to handle pagesize other than 4K
  mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *
  mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *
  kdump: use vmlinux_build_id to simplify
  buildid: fix kernel-doc notation
  buildid: mark some arguments const
  scripts/decode_stacktrace.sh: indicate 'auto' can be used for base path
  scripts/decode_stacktrace.sh: silence stderr messages from addr2line/nm
  scripts/decode_stacktrace.sh: support debuginfod
  x86/dumpstack: use %pSb/%pBb for backtrace printing
  arm64: stacktrace: use %pSb for backtrace printing
  module: add printk formats to add module build ID to stacktraces
  ...

24 files changed, 142 insertions, 40 deletions

diff --git a/include/linux/bootconfig.h b/include/linux/bootconfig.h
index 6bdd94cff4e2..abe089c27529 100644
--- a/include/linux/bootconfig.h
+++ b/include/linux/bootconfig.h
@@ -214,10 +214,10 @@ static inline struct xbc_node * __init xbc_node_get_subkey(struct xbc_node *node
  * @value: Iterated value of array entry.
  *
  * Iterate array entries of given @key under @node. Each array entry node
- * is stroed to @anode and @value. If the @node doesn't have @key node,
+ * is stored to @anode and @value. If the @node doesn't have @key node,
  * it does nothing.
  * Note that even if the found key node has only one value (not array)
- * this executes block once. Hoever, if the found key node has no value
+ * this executes block once. However, if the found key node has no value
  * (key-only node), this does nothing. So don't use this for testing the
  * key-value pair existence.
  */
diff --git a/include/linux/buildid.h b/include/linux/buildid.h
index 40232f90db6e..3b7a0ff4642f 100644
--- a/include/linux/buildid.h
+++ b/include/linux/buildid.h
@@ -8,5 +8,13 @@
 
 int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id,
 		   __u32 *size);
+int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size);
+
+#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) || IS_ENABLED(CONFIG_CRASH_CORE)
+extern unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX];
+void init_vmlinux_build_id(void);
+#else
+static inline void init_vmlinux_build_id(void) { }
+#endif
 
 #endif
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 4221888bdcd6..c24098c7acca 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -35,12 +35,12 @@ enum compact_result {
 	COMPACT_CONTINUE,
 
 	/*
-	 * The full zone was compacted scanned but wasn't successfull to compact
+	 * The full zone was compacted scanned but wasn't successful to compact
 	 * suitable pages.
 	 */
 	COMPACT_COMPLETE,
 	/*
-	 * direct compaction has scanned part of the zone but wasn't successfull
+	 * direct compaction has scanned part of the zone but wasn't successful
 	 * to compact suitable pages.
 	 */
 	COMPACT_PARTIAL_SKIPPED,
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index bfc4690de4f4..f3689a52bfd0 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -259,7 +259,7 @@ extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool
 /**
  * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
  * @cpu: the (optionally unsigned) integer iterator
- * @mask: the cpumask poiter
+ * @mask: the cpumask pointer
  * @start: the start location
  *
  * The implementation does not assume any bit in @mask is set (including @start).
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 206bde8308b2..de62a722431e 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -38,8 +38,12 @@ phys_addr_t paddr_vmcoreinfo_note(void);
 
 #define VMCOREINFO_OSRELEASE(value) \
 	vmcoreinfo_append_str("OSRELEASE=%s\n", value)
-#define VMCOREINFO_BUILD_ID(value) \
-	vmcoreinfo_append_str("BUILD-ID=%s\n", value)
+#define VMCOREINFO_BUILD_ID()						\
+	({								\
+		static_assert(sizeof(vmlinux_build_id) == 20);		\
+		vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \
+	})
+
 #define VMCOREINFO_PAGESIZE(value) \
 	vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
 #define VMCOREINFO_SYMBOL(name) \
@@ -69,10 +73,6 @@ extern unsigned char *vmcoreinfo_data;
 extern size_t vmcoreinfo_size;
 extern u32 *vmcoreinfo_note;
 
-/* raw contents of kernel .notes section */
-extern const void __start_notes __weak;
-extern const void __stop_notes __weak;
-
 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
 			  void *data, size_t data_len);
 void final_note(Elf_Word *buf);
diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h
index 8d2dde23e9fb..32444686b6ff 100644
--- a/include/linux/debugobjects.h
+++ b/include/linux/debugobjects.h
@@ -18,7 +18,7 @@ enum debug_obj_state {
 struct debug_obj_descr;
 
 /**
- * struct debug_obj - representaion of an tracked object
+ * struct debug_obj - representation of an tracked object
  * @node:	hlist node to link the object into the tracker list
  * @state:	tracked object state
  * @astate:	current active state
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 866a0fa104c4..2fd2e91d5107 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -113,7 +113,7 @@ int hmm_range_fault(struct hmm_range *range);
  * HMM_RANGE_DEFAULT_TIMEOUT - default timeout (ms) when waiting for a range
  *
  * When waiting for mmu notifiers we need some kind of time out otherwise we
- * could potentialy wait for ever, 1000ms ie 1s sounds like a long time to
+ * could potentially wait for ever, 1000ms ie 1s sounds like a long time to
  * wait already.
  */
 #define HMM_RANGE_DEFAULT_TIMEOUT 1000
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8e0f32f935bd..f7ca1a3870ea 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -51,7 +51,7 @@ struct hugepage_subpool {
 	long count;
 	long max_hpages;	/* Maximum huge pages or -1 if no maximum. */
 	long used_hpages;	/* Used count against maximum, includes */
-				/* both alloced and reserved pages. */
+				/* both allocated and reserved pages. */
 	struct hstate *hstate;
 	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
 	long rsv_hpages;	/* Pages reserved against global pool to */
@@ -85,7 +85,7 @@ struct resv_map {
  * by a resv_map's lock.  The set of regions within the resv_map represent
  * reservations for huge pages, or huge pages that have already been
  * instantiated within the map.  The from and to elements are huge page
- * indicies into the associated mapping.  from indicates the starting index
+ * indices into the associated mapping.  from indicates the starting index
  * of the region.  to represents the first index past the end of  the region.
  *
  * For example, a file region structure with from == 0 and to == 4 represents
@@ -797,7 +797,7 @@ static inline bool hugepage_migration_supported(struct hstate *h)
  * It determines whether or not a huge page should be placed on
  * movable zone or not. Movability of any huge page should be
  * required only if huge page size is supported for migration.
- * There wont be any reason for the huge page to be movable if
+ * There won't be any reason for the huge page to be movable if
  * it is not migratable to start with. Also the size of the huge
  * page should be large enough to be placed under a movable zone
  * and still feasible enough to be migratable. Just the presence
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 465060acc981..a1d6fc82d7f0 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -7,6 +7,7 @@
 #define _LINUX_KALLSYMS_H
 
 #include <linux/errno.h>
+#include <linux/buildid.h>
 #include <linux/kernel.h>
 #include <linux/stddef.h>
 #include <linux/mm.h>
@@ -15,8 +16,10 @@
 #include <asm/sections.h>
 
 #define KSYM_NAME_LEN 128
-#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
-			 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
+#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s %s]") + \
+			(KSYM_NAME_LEN - 1) + \
+			2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + \
+			(BUILD_ID_SIZE_MAX * 2) + 1)
 
 struct cred;
 struct module;
@@ -91,8 +94,10 @@ const char *kallsyms_lookup(unsigned long addr,
 
 /* Look up a kernel symbol and return it in a text buffer. */
 extern int sprint_symbol(char *buffer, unsigned long address);
+extern int sprint_symbol_build_id(char *buffer, unsigned long address);
 extern int sprint_symbol_no_offset(char *buffer, unsigned long address);
 extern int sprint_backtrace(char *buffer, unsigned long address);
+extern int sprint_backtrace_build_id(char *buffer, unsigned long address);
 
 int lookup_symbol_name(unsigned long addr, char *symname);
 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
@@ -128,6 +133,12 @@ static inline int sprint_symbol(char *buffer, unsigned long addr)
 	return 0;
 }
 
+static inline int sprint_symbol_build_id(char *buffer, unsigned long address)
+{
+	*buffer = '\0';
+	return 0;
+}
+
 static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
 {
 	*buffer = '\0';
@@ -140,6 +151,12 @@ static inline int sprint_backtrace(char *buffer, unsigned long addr)
 	return 0;
 }
 
+static inline int sprint_backtrace_build_id(char *buffer, unsigned long addr)
+{
+	*buffer = '\0';
+	return 0;
+}
+
 static inline int lookup_symbol_name(unsigned long addr, char *symname)
 {
 	return -ERANGE;
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index 9dcaa3e582c9..1b5fceb565df 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -146,7 +146,7 @@ typedef enum lru_status (*list_lru_walk_cb)(struct list_head *item,
  * @lru: the lru pointer.
  * @nid: the node id to scan from.
  * @memcg: the cgroup to scan from.
- * @isolate: callback function that is resposible for deciding what to do with
+ * @isolate: callback function that is responsible for deciding what to do with
  *  the item currently being scanned
  * @cb_arg: opaque type that will be passed to @isolate
  * @nr_to_walk: how many items to scan.
@@ -172,7 +172,7 @@ unsigned long list_lru_walk_one(struct list_lru *lru,
  * @lru: the lru pointer.
  * @nid: the node id to scan from.
  * @memcg: the cgroup to scan from.
- * @isolate: callback function that is resposible for deciding what to do with
+ * @isolate: callback function that is responsible for deciding what to do with
  *  the item currently being scanned
  * @cb_arg: opaque type that will be passed to @isolate
  * @nr_to_walk: how many items to scan.
diff --git a/include/linux/lru_cache.h b/include/linux/lru_cache.h
index 429d67d815ce..07add7882a5d 100644
--- a/include/linux/lru_cache.h
+++ b/include/linux/lru_cache.h
@@ -32,7 +32,7 @@ This header file (and its .c file; kernel-doc of functions see there)
   Because of this later property, it is called "lru_cache".
   As it actually Tracks Objects in an Active SeT, we could also call it
   toast (incidentally that is what may happen to the data on the
-  backend storage uppon next resync, if we don't get it right).
+  backend storage upon next resync, if we don't get it right).
 
 What for?
 
@@ -152,7 +152,7 @@ struct lc_element {
 	 * for paranoia, and for "lc_element_to_index" */
 	unsigned lc_index;
 	/* if we want to track a larger set of objects,
-	 * it needs to become arch independend u64 */
+	 * it needs to become an architecture independent u64 */
 	unsigned lc_number;
 	/* special label when on free list */
 #define LC_FREE (~0U)
@@ -263,7 +263,7 @@ extern void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char
  *
  * Allows (expects) the set to be "dirty".  Note that the reference counts and
  * order on the active and lru lists may still change.  Used to serialize
- * changing transactions.  Returns true if we aquired the lock.
+ * changing transactions.  Returns true if we acquired the lock.
  */
 static inline int lc_try_lock_for_transaction(struct lru_cache *lc)
 {
@@ -275,7 +275,7 @@ static inline int lc_try_lock_for_transaction(struct lru_cache *lc)
  * @lc: the lru cache to operate on
  *
  * Note that the reference counts and order on the active and lru lists may
- * still change.  Only works on a "clean" set.  Returns true if we aquired the
+ * still change.  Only works on a "clean" set.  Returns true if we acquired the
  * lock, which means there are no pending changes, and any further attempt to
  * change the set will not succeed until the next lc_unlock().
  */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 788a0b1323d0..57453dba41b9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -238,6 +238,9 @@ int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
 
 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
 
+void setup_initial_init_mm(void *start_code, void *end_code,
+			   void *end_data, void *brk);
+
 /*
  * Linux kernel virtual memory manager primitives.
  * The idea being to have a "virtual" mm in the same way
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 6692da8d121d..45fc2c81e370 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -33,7 +33,7 @@ struct mmu_interval_notifier;
  *
  * @MMU_NOTIFY_SOFT_DIRTY: soft dirty accounting (still same page and same
  * access flags). User should soft dirty the page in the end callback to make
- * sure that anyone relying on soft dirtyness catch pages that might be written
+ * sure that anyone relying on soft dirtiness catch pages that might be written
  * through non CPU mappings.
  *
  * @MMU_NOTIFY_RELEASE: used during mmu_interval_notifier invalidate to signal
@@ -167,7 +167,7 @@ struct mmu_notifier_ops {
 	 * decrease the refcount. If the refcount is decreased on
 	 * invalidate_range_start() then the VM can free pages as page
 	 * table entries are removed.  If the refcount is only
-	 * droppped on invalidate_range_end() then the driver itself
+	 * dropped on invalidate_range_end() then the driver itself
 	 * will drop the last refcount but it must take care to flush
 	 * any secondary tlb before doing the final free on the
 	 * page. Pages will no longer be referenced by the linux
@@ -196,7 +196,7 @@ struct mmu_notifier_ops {
 	 * If invalidate_range() is used to manage a non-CPU TLB with
 	 * shared page-tables, it not necessary to implement the
 	 * invalidate_range_start()/end() notifiers, as
-	 * invalidate_range() alread catches the points in time when an
+	 * invalidate_range() already catches the points in time when an
 	 * external TLB range needs to be flushed. For more in depth
 	 * discussion on this see Documentation/vm/mmu_notifier.rst
 	 *
@@ -369,7 +369,7 @@ mmu_interval_read_retry(struct mmu_interval_notifier *interval_sub,
  * mmu_interval_read_retry() will return true.
  *
  * False is not reliable and only suggests a collision may not have
- * occured. It can be called many times and does not have to hold the user
+ * occurred. It can be called many times and does not have to hold the user
  * provided lock.
  *
  * This call can be used as part of loops and other expensive operations to
diff --git a/include/linux/module.h b/include/linux/module.h
index 8100bb477d86..8a298d820dbc 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -11,6 +11,7 @@
 
 #include <linux/list.h>
 #include <linux/stat.h>
+#include <linux/buildid.h>
 #include <linux/compiler.h>
 #include <linux/cache.h>
 #include <linux/kmod.h>
@@ -369,6 +370,11 @@ struct module {
 	/* Unique handle for this module */
 	char name[MODULE_NAME_LEN];
 
+#ifdef CONFIG_STACKTRACE_BUILD_ID
+	/* Module build ID */
+	unsigned char build_id[BUILD_ID_SIZE_MAX];
+#endif
+
 	/* Sysfs stuff. */
 	struct module_kobject mkobj;
 	struct module_attribute *modinfo_attrs;
@@ -636,7 +642,7 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr);
 const char *module_address_lookup(unsigned long addr,
 			    unsigned long *symbolsize,
 			    unsigned long *offset,
-			    char **modname,
+			    char **modname, const unsigned char **modbuildid,
 			    char *namebuf);
 int lookup_module_symbol_name(unsigned long addr, char *symname);
 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
@@ -740,6 +746,7 @@ static inline const char *module_address_lookup(unsigned long addr,
 					  unsigned long *symbolsize,
 					  unsigned long *offset,
 					  char **modname,
+					  const unsigned char **modbuildid,
 					  char *namebuf)
 {
 	return NULL;
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index ac398e143c9a..567c3ddba2c4 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -119,7 +119,7 @@ static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m)
  * The inline keyword gives the compiler room to decide to inline, or
  * not inline a function as it sees best.  However, as these functions
  * are called in both __init and non-__init functions, if they are not
- * inlined we will end up with a section mis-match error (of the type of
+ * inlined we will end up with a section mismatch error (of the type of
  * freeable items not being freed).  So we must use __always_inline here
  * to fix the problem.  If other functions in the future also end up in
  * this situation they will also need to be annotated as __always_inline
@@ -515,7 +515,7 @@ static inline int node_random(const nodemask_t *mask)
 #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
 
 /*
- * For nodemask scrach area.
+ * For nodemask scratch area.
  * NODEMASK_ALLOC(type, name) allocates an object with a specified type and
  * name.
  */
@@ -528,7 +528,7 @@ static inline int node_random(const nodemask_t *mask)
 #define NODEMASK_FREE(m)			do {} while (0)
 #endif
 
-/* A example struture for using NODEMASK_ALLOC, used in mempolicy. */
+/* Example structure for using NODEMASK_ALLOC, used in mempolicy. */
 struct nodemask_scratch {
 	nodemask_t	mask1;
 	nodemask_t	mask2;
diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index dff7040f629a..af1071535de8 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -412,7 +412,7 @@ do {									\
  * instead.
  *
  * If there is no other protection through preempt disable and/or disabling
- * interupts then one of these RMW operations can show unexpected behavior
+ * interrupts then one of these RMW operations can show unexpected behavior
  * because the execution thread was rescheduled on another processor or an
  * interrupt occurred and the same percpu variable was modified from the
  * interrupt context.
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 16c35a728b4c..ae16a9856305 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -213,7 +213,7 @@ static inline void percpu_ref_get_many(struct percpu_ref *ref, unsigned long nr)
  * percpu_ref_get - increment a percpu refcount
  * @ref: percpu_ref to get
  *
- * Analagous to atomic_long_inc().
+ * Analogous to atomic_long_inc().
  *
  * This function is safe to call as long as @ref is between init and exit.
  */
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index e82660f7b9e4..d147480cdefc 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -106,7 +106,7 @@ static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 #ifndef pmd_offset
 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 {
-	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
+	return pud_pgtable(*pud) + pmd_index(address);
 }
 #define pmd_offset pmd_offset
 #endif
@@ -114,7 +114,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 #ifndef pud_offset
 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 {
-	return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
+	return p4d_pgtable(*p4d) + pud_index(address);
 }
 #define pud_offset pud_offset
 #endif
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 6f70572b2938..ecf87484814f 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -474,7 +474,7 @@ sg_page_iter_dma_address(struct sg_dma_page_iter *dma_iter)
  * Iterates over sg entries mapping page-by-page.  On each successful
  * iteration, @miter->page points to the mapped page and
  * @miter->length bytes of data can be accessed at @miter->addr.  As
- * long as an interation is enclosed between start and stop, the user
+ * long as an iteration is enclosed between start and stop, the user
  * is free to choose control structure and when to stop.
  *
  * @miter->consumed is set to @miter->length on each iteration.  It
diff --git a/include/linux/secretmem.h b/include/linux/secretmem.h
new file mode 100644
index 000000000000..21c3771e6a56
--- /dev/null
+++ b/include/linux/secretmem.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_SECRETMEM_H
+#define _LINUX_SECRETMEM_H
+
+#ifdef CONFIG_SECRETMEM
+
+extern const struct address_space_operations secretmem_aops;
+
+static inline bool page_is_secretmem(struct page *page)
+{
+	struct address_space *mapping;
+
+	/*
+	 * Using page_mapping() is quite slow because of the actual call
+	 * instruction and repeated compound_head(page) inside the
+	 * page_mapping() function.
+	 * We know that secretmem pages are not compound and LRU so we can
+	 * save a couple of cycles here.
+	 */
+	if (PageCompound(page) || !PageLRU(page))
+		return false;
+
+	mapping = (struct address_space *)
+		((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
+
+	if (mapping != page->mapping)
+		return false;
+
+	return mapping->a_ops == &secretmem_aops;
+}
+
+bool vma_is_secretmem(struct vm_area_struct *vma);
+bool secretmem_active(void);
+
+#else
+
+static inline bool vma_is_secretmem(struct vm_area_struct *vma)
+{
+	return false;
+}
+
+static inline bool page_is_secretmem(struct page *page)
+{
+	return false;
+}
+
+static inline bool secretmem_active(void)
+{
+	return false;
+}
+
+#endif /* CONFIG_SECRETMEM */
+
+#endif /* _LINUX_SECRETMEM_H */
diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index fe1aa4e54680..f36be5166c19 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -28,7 +28,19 @@ static inline bool kernel_page_present(struct page *page)
 {
 	return true;
 }
+#else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
+/*
+ * Some architectures, e.g. ARM64 can disable direct map modifications at
+ * boot time. Let them overrive this query.
+ */
+#ifndef can_set_direct_map
+static inline bool can_set_direct_map(void)
+{
+	return true;
+}
+#define can_set_direct_map can_set_direct_map
 #endif
+#endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
 
 #ifndef set_mce_nospec
 static inline int set_mce_nospec(unsigned long pfn, bool unmap)
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 1eac79ce57d4..9814fff58a69 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -4,7 +4,7 @@
 
 /*
  * This struct is used to pass information from page reclaim to the shrinkers.
- * We consolidate the values for easier extention later.
+ * We consolidate the values for easier extension later.
  *
  * The 'gfpmask' refers to the allocation we are currently trying to
  * fulfil.
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 586128d5c3b8..69c9a7010081 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1050,6 +1050,7 @@ asmlinkage long sys_landlock_create_ruleset(const struct landlock_ruleset_attr _
 asmlinkage long sys_landlock_add_rule(int ruleset_fd, enum landlock_rule_type rule_type,
 		const void __user *rule_attr, __u32 flags);
 asmlinkage long sys_landlock_restrict_self(int ruleset_fd, __u32 flags);
+asmlinkage long sys_memfd_secret(unsigned int flags);
 
 /*
  * Architecture-specific system calls
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 1dabd6f22486..2644425b6dce 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -29,7 +29,7 @@ struct notifier_block;		/* in notifier.h */
 #define VM_NO_HUGE_VMAP		0x00000400	/* force PAGE_SIZE pte mapping */
 
 /*
- * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC.
+ * VM_KASAN is used slightly differently depending on CONFIG_KASAN_VMALLOC.
  *
  * If IS_ENABLED(CONFIG_KASAN_VMALLOC), VM_KASAN is set on a vm_struct after
  * shadow memory has been mapped. It's used to handle allocation errors so that
@@ -247,7 +247,7 @@ static inline void set_vm_flush_reset_perms(void *addr)
 extern long vread(char *buf, char *addr, unsigned long count);
 
 /*
- *	Internals.  Dont't use..
+ *	Internals.  Don't use..
  */
 extern struct list_head vmap_area_list;
 extern __init void vm_area_add_early(struct vm_struct *vm);