Merge branch 'akpm' (patches from Andrew)

Merge yet more updates from Andrew Morton:

 - More MM work. 100ish more to go. Mike Rapoport's "mm: remove
   __ARCH_HAS_5LEVEL_HACK" series should fix the current ppc issue

 - Various other little subsystems

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (127 commits)
  lib/ubsan.c: fix gcc-10 warnings
  tools/testing/selftests/vm: remove duplicate headers
  selftests: vm: pkeys: fix multilib builds for x86
  selftests: vm: pkeys: use the correct page size on powerpc
  selftests/vm/pkeys: override access right definitions on powerpc
  selftests/vm/pkeys: test correct behaviour of pkey-0
  selftests/vm/pkeys: introduce a sub-page allocator
  selftests/vm/pkeys: detect write violation on a mapped access-denied-key page
  selftests/vm/pkeys: associate key on a mapped page and detect write violation
  selftests/vm/pkeys: associate key on a mapped page and detect access violation
  selftests/vm/pkeys: improve checks to determine pkey support
  selftests/vm/pkeys: fix assertion in test_pkey_alloc_exhaust()
  selftests/vm/pkeys: fix number of reserved powerpc pkeys
  selftests/vm/pkeys: introduce powerpc support
  selftests/vm/pkeys: introduce generic pkey abstractions
  selftests: vm: pkeys: use the correct huge page size
  selftests/vm/pkeys: fix alloc_random_pkey() to make it really random
  selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()
  selftests/vm/pkeys: fix pkey_disable_clear()
  selftests: vm: pkeys: add helpers for pkey bits
  ...

13 files changed, 106 insertions, 157 deletions

diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h
deleted file mode 100644
index 58046ddc08d0..000000000000
--- a/include/asm-generic/5level-fixup.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _5LEVEL_FIXUP_H
-#define _5LEVEL_FIXUP_H
-
-#define __ARCH_HAS_5LEVEL_HACK
-#define __PAGETABLE_P4D_FOLDED 1
-
-#define P4D_SHIFT			PGDIR_SHIFT
-#define P4D_SIZE			PGDIR_SIZE
-#define P4D_MASK			PGDIR_MASK
-#define MAX_PTRS_PER_P4D		1
-#define PTRS_PER_P4D			1
-
-#define p4d_t				pgd_t
-
-#define pud_alloc(mm, p4d, address) \
-	((unlikely(pgd_none(*(p4d))) && __pud_alloc(mm, p4d, address)) ? \
-		NULL : pud_offset(p4d, address))
-
-#define p4d_alloc(mm, pgd, address)		(pgd)
-#define p4d_alloc_track(mm, pgd, address, mask)	(pgd)
-#define p4d_offset(pgd, start)			(pgd)
-
-#ifndef __ASSEMBLY__
-static inline int p4d_none(p4d_t p4d)
-{
-	return 0;
-}
-
-static inline int p4d_bad(p4d_t p4d)
-{
-	return 0;
-}
-
-static inline int p4d_present(p4d_t p4d)
-{
-	return 1;
-}
-#endif
-
-#define p4d_ERROR(p4d)			do { } while (0)
-#define p4d_clear(p4d)			pgd_clear(p4d)
-#define p4d_val(p4d)			pgd_val(p4d)
-#define p4d_populate(mm, p4d, pud)	pgd_populate(mm, p4d, pud)
-#define p4d_populate_safe(mm, p4d, pud)	pgd_populate(mm, p4d, pud)
-#define p4d_page(p4d)			pgd_page(p4d)
-#define p4d_page_vaddr(p4d)		pgd_page_vaddr(p4d)
-
-#define __p4d(x)			__pgd(x)
-#define set_p4d(p4dp, p4d)		set_pgd(p4dp, p4d)
-
-#undef p4d_free_tlb
-#define p4d_free_tlb(tlb, x, addr)	do { } while (0)
-#define p4d_free(mm, x)			do { } while (0)
-
-#undef  p4d_addr_end
-#define p4d_addr_end(addr, end)		(end)
-
-#endif
diff --git a/include/asm-generic/pgtable-nop4d-hack.h b/include/asm-generic/pgtable-nop4d-hack.h
deleted file mode 100644
index 829bdb0d6327..000000000000
--- a/include/asm-generic/pgtable-nop4d-hack.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _PGTABLE_NOP4D_HACK_H
-#define _PGTABLE_NOP4D_HACK_H
-
-#ifndef __ASSEMBLY__
-#include <asm-generic/5level-fixup.h>
-
-#define __PAGETABLE_PUD_FOLDED 1
-
-/*
- * Having the pud type consist of a pgd gets the size right, and allows
- * us to conceptually access the pgd entry that this pud is folded into
- * without casting.
- */
-typedef struct { pgd_t pgd; } pud_t;
-
-#define PUD_SHIFT	PGDIR_SHIFT
-#define PTRS_PER_PUD	1
-#define PUD_SIZE	(1UL << PUD_SHIFT)
-#define PUD_MASK	(~(PUD_SIZE-1))
-
-/*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
- * setup: the pud is never bad, and a pud always exists (as it's folded
- * into the pgd entry)
- */
-static inline int pgd_none(pgd_t pgd)		{ return 0; }
-static inline int pgd_bad(pgd_t pgd)		{ return 0; }
-static inline int pgd_present(pgd_t pgd)	{ return 1; }
-static inline void pgd_clear(pgd_t *pgd)	{ }
-#define pud_ERROR(pud)				(pgd_ERROR((pud).pgd))
-
-#define pgd_populate(mm, pgd, pud)		do { } while (0)
-#define pgd_populate_safe(mm, pgd, pud)		do { } while (0)
-/*
- * (puds are folded into pgds so this doesn't get actually called,
- * but the define is needed for a generic inline function.)
- */
-#define set_pgd(pgdptr, pgdval)	set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
-
-static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
-{
-	return (pud_t *)pgd;
-}
-
-#define pud_val(x)				(pgd_val((x).pgd))
-#define __pud(x)				((pud_t) { __pgd(x) })
-
-#define pgd_page(pgd)				(pud_page((pud_t){ pgd }))
-#define pgd_page_vaddr(pgd)			(pud_page_vaddr((pud_t){ pgd }))
-
-/*
- * allocating and freeing a pud is trivial: the 1-entry pud is
- * inside the pgd, so has no extra memory associated with it.
- */
-#define pud_alloc_one(mm, address)		NULL
-#define pud_free(mm, x)				do { } while (0)
-#define __pud_free_tlb(tlb, x, a)		do { } while (0)
-
-#undef  pud_addr_end
-#define pud_addr_end(addr, end)			(end)
-
-#endif /* __ASSEMBLY__ */
-#endif /* _PGTABLE_NOP4D_HACK_H */
diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h
index d3776cb494c0..ad05c1684bfc 100644
--- a/include/asm-generic/pgtable-nopud.h
+++ b/include/asm-generic/pgtable-nopud.h
@@ -4,9 +4,6 @@
 
 #ifndef __ASSEMBLY__
 
-#ifdef __ARCH_USE_5LEVEL_HACK
-#include <asm-generic/pgtable-nop4d-hack.h>
-#else
 #include <asm-generic/pgtable-nop4d.h>
 
 #define __PAGETABLE_PUD_FOLDED 1
@@ -65,5 +62,4 @@ static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 #define pud_addr_end(addr, end)			(end)
 
 #endif /* __ASSEMBLY__ */
-#endif /* !__ARCH_USE_5LEVEL_HACK */
 #endif /* _PGTABLE_NOPUD_H */
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 0a9d042e075a..de1ccdcd5703 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -668,10 +668,6 @@ int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
 int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
 		struct ttm_bo_device *bdev);
 
-void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot);
-
-void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot);
-
 /**
  * ttm_bo_io
  *
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index aece1b340e7d..4a20b7517dd0 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -130,8 +130,7 @@ extern int setup_arg_pages(struct linux_binprm * bprm,
 extern int transfer_args_to_stack(struct linux_binprm *bprm,
 				  unsigned long *sp_location);
 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
-extern int copy_strings_kernel(int argc, const char *const *argv,
-			       struct linux_binprm *bprm);
+int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
 extern void set_binfmt(struct linux_binfmt *new);
 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
 
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 9acf654f0b19..99f2ac30b1d9 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -72,7 +72,7 @@ static inline int get_bitmask_order(unsigned int count)
 
 static __always_inline unsigned long hweight_long(unsigned long w)
 {
-	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
+	return sizeof(w) == 4 ? hweight32(w) : hweight64((__u64)w);
 }
 
 /**
diff --git a/include/linux/elfnote.h b/include/linux/elfnote.h
index 594d4e78654f..69b136e4dd2b 100644
--- a/include/linux/elfnote.h
+++ b/include/linux/elfnote.h
@@ -54,7 +54,7 @@
 .popsection				;
 
 #define ELFNOTE(name, type, desc)		\
-	ELFNOTE_START(name, type, "")		\
+	ELFNOTE_START(name, type, "a")		\
 		desc			;	\
 	ELFNOTE_END
 
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index ea5cdbd8c2c3..d6e82e3de027 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -32,8 +32,65 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
 #include <asm/kmap_types.h>
 
 #ifdef CONFIG_HIGHMEM
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
+extern void kunmap_atomic_high(void *kvaddr);
 #include <asm/highmem.h>
 
+#ifndef ARCH_HAS_KMAP_FLUSH_TLB
+static inline void kmap_flush_tlb(unsigned long addr) { }
+#endif
+
+#ifndef kmap_prot
+#define kmap_prot PAGE_KERNEL
+#endif
+
+void *kmap_high(struct page *page);
+static inline void *kmap(struct page *page)
+{
+	void *addr;
+
+	might_sleep();
+	if (!PageHighMem(page))
+		addr = page_address(page);
+	else
+		addr = kmap_high(page);
+	kmap_flush_tlb((unsigned long)addr);
+	return addr;
+}
+
+void kunmap_high(struct page *page);
+
+static inline void kunmap(struct page *page)
+{
+	might_sleep();
+	if (!PageHighMem(page))
+		return;
+	kunmap_high(page);
+}
+
+/*
+ * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
+ * no global lock is needed and because the kmap code must perform a global TLB
+ * invalidation when the kmap pool wraps.
+ *
+ * However when holding an atomic kmap is is not legal to sleep, so atomic
+ * kmaps are appropriate for short, tight code paths only.
+ *
+ * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
+ * gives a more generic (and caching) interface. But kmap_atomic can
+ * be used in IRQ contexts, so in some (very limited) cases we need
+ * it.
+ */
+static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
+{
+	preempt_disable();
+	pagefault_disable();
+	if (!PageHighMem(page))
+		return page_address(page);
+	return kmap_atomic_high_prot(page, prot);
+}
+#define kmap_atomic(page)	kmap_atomic_prot(page, kmap_prot)
+
 /* declarations for linux/mm/highmem.c */
 unsigned int nr_free_highpages(void);
 extern atomic_long_t _totalhigh_pages;
@@ -77,15 +134,21 @@ static inline struct page *kmap_to_page(void *addr)
 
 static inline unsigned long totalhigh_pages(void) { return 0UL; }
 
-#ifndef ARCH_HAS_KMAP
 static inline void *kmap(struct page *page)
 {
 	might_sleep();
 	return page_address(page);
 }
 
+static inline void kunmap_high(struct page *page)
+{
+}
+
 static inline void kunmap(struct page *page)
 {
+#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
+	kunmap_flush_on_unmap(page_address(page));
+#endif
 }
 
 static inline void *kmap_atomic(struct page *page)
@@ -96,16 +159,20 @@ static inline void *kmap_atomic(struct page *page)
 }
 #define kmap_atomic_prot(page, prot)	kmap_atomic(page)
 
-static inline void __kunmap_atomic(void *addr)
+static inline void kunmap_atomic_high(void *addr)
 {
-	pagefault_enable();
-	preempt_enable();
+	/*
+	 * Mostly nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic()
+	 * handles re-enabling faults + preemption
+	 */
+#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
+	kunmap_flush_on_unmap(addr);
+#endif
 }
 
 #define kmap_atomic_pfn(pfn)	kmap_atomic(pfn_to_page(pfn))
 
 #define kmap_flush_unused()	do {} while(0)
-#endif
 
 #endif /* CONFIG_HIGHMEM */
 
@@ -149,7 +216,9 @@ static inline void kmap_atomic_idx_pop(void)
 #define kunmap_atomic(addr)                                     \
 do {                                                            \
 	BUILD_BUG_ON(__same_type((addr), struct page *));       \
-	__kunmap_atomic(addr);                                  \
+	kunmap_atomic_high(addr);                                  \
+	pagefault_enable();                                     \
+	preempt_enable();                                       \
 } while (0)
 
 
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index a9b9170b5dd2..cc9a5b4593ca 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -103,6 +103,7 @@ struct resource {
 #define IORESOURCE_MEM_32BIT		(3<<3)
 #define IORESOURCE_MEM_SHADOWABLE	(1<<5)	/* dup: IORESOURCE_SHADOWABLE */
 #define IORESOURCE_MEM_EXPANSIONROM	(1<<6)
+#define IORESOURCE_MEM_DRIVER_MANAGED	(1<<7)
 
 /* PnP I/O specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_IO_16BIT_ADDR	(1<<0)
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 93d9ada74ddd..fee7fab5d706 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -314,19 +314,12 @@ static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
 
-extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 extern void try_offline_node(int nid);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 extern int remove_memory(int nid, u64 start, u64 size);
 extern void __remove_memory(int nid, u64 start, u64 size);
 
 #else
-static inline bool is_mem_section_removable(unsigned long pfn,
-					unsigned long nr_pages)
-{
-	return false;
-}
-
 static inline void try_offline_node(int nid) {}
 
 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
@@ -349,6 +342,8 @@ extern void __ref free_area_init_core_hotplug(int nid);
 extern int __add_memory(int nid, u64 start, u64 size);
 extern int add_memory(int nid, u64 start, u64 size);
 extern int add_memory_resource(int nid, struct resource *resource);
+extern int add_memory_driver_managed(int nid, u64 start, u64 size,
+				     const char *resource_name);
 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
 		unsigned long nr_pages, struct vmem_altmap *altmap);
 extern void remove_pfn_range_from_zone(struct zone *zone,
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 66e0977f970a..86adc71a972f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -776,6 +776,7 @@ static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
 }
 
 extern void kvfree(const void *addr);
+extern void kvfree_sensitive(const void *addr, size_t len);
 
 /*
  * Mapcount of compound page as a whole, does not include mapped sub-pages.
@@ -1372,7 +1373,7 @@ static inline int cpu_pid_to_cpupid(int nid, int pid)
 
 static inline bool cpupid_pid_unset(int cpupid)
 {
-	return 1;
+	return true;
 }
 
 static inline void page_cpupid_reset_last(struct page *page)
@@ -1725,7 +1726,7 @@ struct frame_vector {
 	unsigned int nr_frames;	/* Number of frames stored in ptrs array */
 	bool got_ref;		/* Did we pin pages by getting page ref? */
 	bool is_pfns;		/* Does array contain pages or pfns? */
-	void *ptrs[0];		/* Array of pinned pfns / pages. Use
+	void *ptrs[];		/* Array of pinned pfns / pages. Use
 				 * pfns_vector_pages() or pfns_vector_pfns()
 				 * for access */
 };
@@ -2069,11 +2070,6 @@ int __pte_alloc_kernel(pmd_t *pmd);
 
 #if defined(CONFIG_MMU)
 
-/*
- * The following ifdef needed to get the 5level-fixup.h header to work.
- * Remove it when 5level-fixup.h has been removed.
- */
-#ifndef __ARCH_HAS_5LEVEL_HACK
 static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd,
 		unsigned long address)
 {
@@ -2102,8 +2098,6 @@ static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
 	return p4d_offset(pgd, address);
 }
 
-#endif /* !__ARCH_HAS_5LEVEL_HACK */
-
 static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
 				     unsigned long address,
 				     pgtbl_mod_mask *mod_mask)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 57a5ce9f33c5..c5d96e3e7fff 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1247,6 +1247,9 @@ struct task_struct {
 
 	/* KCOV sequence number: */
 	int				kcov_sequence;
+
+	/* Collect coverage from softirq context: */
+	unsigned int			kcov_softirq;
 #endif
 
 #ifdef CONFIG_MEMCG
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 1672cf6f7614..813614d4b71f 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -145,6 +145,25 @@ void *__seq_open_private(struct file *, const struct seq_operations *, int);
 int seq_open_private(struct file *, const struct seq_operations *, int);
 int seq_release_private(struct inode *, struct file *);
 
+#define DEFINE_SEQ_ATTRIBUTE(__name)					\
+static int __name ## _open(struct inode *inode, struct file *file)	\
+{									\
+	int ret = seq_open(file, &__name ## _sops);			\
+	if (!ret && inode->i_private) {					\
+		struct seq_file *seq_f = file->private_data;		\
+		seq_f->private = inode->i_private;			\
+	}								\
+	return ret;							\
+}									\
+									\
+static const struct file_operations __name ## _fops = {			\
+	.owner		= THIS_MODULE,					\
+	.open		= __name ## _open,				\
+	.read		= seq_read,					\
+	.llseek		= seq_lseek,					\
+	.release	= seq_release,					\
+}
+
 #define DEFINE_SHOW_ATTRIBUTE(__name)					\
 static int __name ## _open(struct inode *inode, struct file *file)	\
 {									\