Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - the rest of MM

 - procfs updates

 - various misc things

 - more y2038 fixes

 - get_maintainer updates

 - lib/ updates

 - checkpatch updates

 - various epoll updates

 - autofs updates

 - hfsplus

 - some reiserfs work

 - fatfs updates

 - signal.c cleanups

 - ipc/ updates

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (166 commits)
  ipc/util.c: update return value of ipc_getref from int to bool
  ipc/util.c: further variable name cleanups
  ipc: simplify ipc initialization
  ipc: get rid of ids->tables_initialized hack
  lib/rhashtable: guarantee initial hashtable allocation
  lib/rhashtable: simplify bucket_table_alloc()
  ipc: drop ipc_lock()
  ipc/util.c: correct comment in ipc_obtain_object_check
  ipc: rename ipcctl_pre_down_nolock()
  ipc/util.c: use ipc_rcu_putref() for failues in ipc_addid()
  ipc: reorganize initialization of kern_ipc_perm.seq
  ipc: compute kern_ipc_perm.id under the ipc lock
  init/Kconfig: remove EXPERT from CHECKPOINT_RESTORE
  fs/sysv/inode.c: use ktime_get_real_seconds() for superblock stamp
  adfs: use timespec64 for time conversion
  kernel/sysctl.c: fix typos in comments
  drivers/rapidio/devices/rio_mport_cdev.c: remove redundant pointer md
  fork: don't copy inconsistent signal handler state to child
  signal: make get_signal() return bool
  signal: make sigkill_pending() return bool
  ...

12 files changed, 434 insertions, 552 deletions

diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig
index 0eaeb41453f5..817c02b13b1d 100644
--- a/fs/proc/Kconfig
+++ b/fs/proc/Kconfig
@@ -31,6 +31,7 @@ config PROC_FS
 config PROC_KCORE
 	bool "/proc/kcore support" if !ARM
 	depends on PROC_FS && MMU
+	select CRASH_CORE
 	help
 	  Provides a virtual ELF core file of the live kernel.  This can
 	  be read with gdb and other ELF tools.  No modifications can be
diff --git a/fs/proc/base.c b/fs/proc/base.c
index aaffc0c30216..ccf86f16d9f0 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -463,7 +463,7 @@ static int lstats_show_proc(struct seq_file *m, void *v)
 	if (!task)
 		return -ESRCH;
 	seq_puts(m, "Latency Top version : v0.1\n");
-	for (i = 0; i < 32; i++) {
+	for (i = 0; i < LT_SAVECOUNT; i++) {
 		struct latency_record *lr = &task->latency_record[i];
 		if (lr->backtrace[0]) {
 			int q;
@@ -1366,10 +1366,8 @@ static ssize_t proc_fail_nth_read(struct file *file, char __user *buf,
 	if (!task)
 		return -ESRCH;
 	len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth);
-	len = simple_read_from_buffer(buf, count, ppos, numbuf, len);
 	put_task_struct(task);
-
-	return len;
+	return simple_read_from_buffer(buf, count, ppos, numbuf, len);
 }
 
 static const struct file_operations proc_fail_nth_operations = {
@@ -2519,47 +2517,47 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
 				   size_t count, loff_t *ppos)
 {
 	struct inode * inode = file_inode(file);
+	struct task_struct *task;
 	void *page;
-	ssize_t length;
-	struct task_struct *task = get_proc_task(inode);
-
-	length = -ESRCH;
-	if (!task)
-		goto out_no_task;
+	int rv;
 
+	rcu_read_lock();
+	task = pid_task(proc_pid(inode), PIDTYPE_PID);
+	if (!task) {
+		rcu_read_unlock();
+		return -ESRCH;
+	}
 	/* A task may only write its own attributes. */
-	length = -EACCES;
-	if (current != task)
-		goto out;
+	if (current != task) {
+		rcu_read_unlock();
+		return -EACCES;
+	}
+	rcu_read_unlock();
 
 	if (count > PAGE_SIZE)
 		count = PAGE_SIZE;
 
 	/* No partial writes. */
-	length = -EINVAL;
 	if (*ppos != 0)
-		goto out;
+		return -EINVAL;
 
 	page = memdup_user(buf, count);
 	if (IS_ERR(page)) {
-		length = PTR_ERR(page);
+		rv = PTR_ERR(page);
 		goto out;
 	}
 
 	/* Guard against adverse ptrace interaction */
-	length = mutex_lock_interruptible(&current->signal->cred_guard_mutex);
-	if (length < 0)
+	rv = mutex_lock_interruptible(&current->signal->cred_guard_mutex);
+	if (rv < 0)
 		goto out_free;
 
-	length = security_setprocattr(file->f_path.dentry->d_name.name,
-				      page, count);
+	rv = security_setprocattr(file->f_path.dentry->d_name.name, page, count);
 	mutex_unlock(&current->signal->cred_guard_mutex);
 out_free:
 	kfree(page);
 out:
-	put_task_struct(task);
-out_no_task:
-	return length;
+	return rv;
 }
 
 static const struct file_operations proc_pid_attr_operations = {
@@ -3309,12 +3307,12 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("cmdline",   S_IRUGO, proc_pid_cmdline_ops),
 	ONE("stat",      S_IRUGO, proc_tid_stat),
 	ONE("statm",     S_IRUGO, proc_pid_statm),
-	REG("maps",      S_IRUGO, proc_tid_maps_operations),
+	REG("maps",      S_IRUGO, proc_pid_maps_operations),
 #ifdef CONFIG_PROC_CHILDREN
 	REG("children",  S_IRUGO, proc_tid_children_operations),
 #endif
 #ifdef CONFIG_NUMA
-	REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
+	REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
 #endif
 	REG("mem",       S_IRUSR|S_IWUSR, proc_mem_operations),
 	LNK("cwd",       proc_cwd_link),
@@ -3324,7 +3322,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("mountinfo",  S_IRUGO, proc_mountinfo_operations),
 #ifdef CONFIG_PROC_PAGE_MONITOR
 	REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
-	REG("smaps",     S_IRUGO, proc_tid_smaps_operations),
+	REG("smaps",     S_IRUGO, proc_pid_smaps_operations),
 	REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
 	REG("pagemap",    S_IRUSR, proc_pagemap_operations),
 #endif
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index bb1c1625b158..8ae109429a88 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -286,9 +286,9 @@ int proc_readdir_de(struct file *file, struct dir_context *ctx,
 	if (!dir_emit_dots(file, ctx))
 		return 0;
 
+	i = ctx->pos - 2;
 	read_lock(&proc_subdir_lock);
 	de = pde_subdir_first(de);
-	i = ctx->pos - 2;
 	for (;;) {
 		if (!de) {
 			read_unlock(&proc_subdir_lock);
@@ -309,8 +309,8 @@ int proc_readdir_de(struct file *file, struct dir_context *ctx,
 			pde_put(de);
 			return 0;
 		}
-		read_lock(&proc_subdir_lock);
 		ctx->pos++;
+		read_lock(&proc_subdir_lock);
 		next = pde_subdir_next(de);
 		pde_put(de);
 		de = next;
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 85ffbd27f288..fc5306a31a1d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -105,8 +105,10 @@ void __init proc_init_kmemcache(void)
 		kmem_cache_create("pde_opener", sizeof(struct pde_opener), 0,
 				  SLAB_ACCOUNT|SLAB_PANIC, NULL);
 	proc_dir_entry_cache = kmem_cache_create_usercopy(
-		"proc_dir_entry", SIZEOF_PDE_SLOT, 0, SLAB_PANIC,
-		OFFSETOF_PDE_NAME, SIZEOF_PDE_INLINE_NAME, NULL);
+		"proc_dir_entry", SIZEOF_PDE, 0, SLAB_PANIC,
+		offsetof(struct proc_dir_entry, inline_name),
+		SIZEOF_PDE_INLINE_NAME, NULL);
+	BUILD_BUG_ON(sizeof(struct proc_dir_entry) >= SIZEOF_PDE);
 }
 
 static int proc_show_options(struct seq_file *seq, struct dentry *root)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index da3dbfa09e79..5185d7f6a51e 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -65,16 +65,13 @@ struct proc_dir_entry {
 	char inline_name[];
 } __randomize_layout;
 
-#define OFFSETOF_PDE_NAME offsetof(struct proc_dir_entry, inline_name)
-#define SIZEOF_PDE_SLOT					\
-	(OFFSETOF_PDE_NAME + 34 <= 64 ? 64 :		\
-	 OFFSETOF_PDE_NAME + 34 <= 128 ? 128 :		\
-	 OFFSETOF_PDE_NAME + 34 <= 192 ? 192 :		\
-	 OFFSETOF_PDE_NAME + 34 <= 256 ? 256 :		\
-	 OFFSETOF_PDE_NAME + 34 <= 512 ? 512 :		\
-	 0)
-
-#define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE_SLOT - OFFSETOF_PDE_NAME)
+#define SIZEOF_PDE	(				\
+	sizeof(struct proc_dir_entry) < 128 ? 128 :	\
+	sizeof(struct proc_dir_entry) < 192 ? 192 :	\
+	sizeof(struct proc_dir_entry) < 256 ? 256 :	\
+	sizeof(struct proc_dir_entry) < 512 ? 512 :	\
+	0)
+#define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry))
 
 extern struct kmem_cache *proc_dir_entry_cache;
 void pde_free(struct proc_dir_entry *pde);
@@ -116,12 +113,12 @@ static inline void *__PDE_DATA(const struct inode *inode)
 	return PDE(inode)->data;
 }
 
-static inline struct pid *proc_pid(struct inode *inode)
+static inline struct pid *proc_pid(const struct inode *inode)
 {
 	return PROC_I(inode)->pid;
 }
 
-static inline struct task_struct *get_proc_task(struct inode *inode)
+static inline struct task_struct *get_proc_task(const struct inode *inode)
 {
 	return get_pid_task(proc_pid(inode), PIDTYPE_PID);
 }
@@ -285,7 +282,6 @@ struct proc_maps_private {
 	struct inode *inode;
 	struct task_struct *task;
 	struct mm_struct *mm;
-	struct mem_size_stats *rollup;
 #ifdef CONFIG_MMU
 	struct vm_area_struct *tail_vma;
 #endif
@@ -297,12 +293,9 @@ struct proc_maps_private {
 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
 
 extern const struct file_operations proc_pid_maps_operations;
-extern const struct file_operations proc_tid_maps_operations;
 extern const struct file_operations proc_pid_numa_maps_operations;
-extern const struct file_operations proc_tid_numa_maps_operations;
 extern const struct file_operations proc_pid_smaps_operations;
 extern const struct file_operations proc_pid_smaps_rollup_operations;
-extern const struct file_operations proc_tid_smaps_operations;
 extern const struct file_operations proc_clear_refs_operations;
 extern const struct file_operations proc_pagemap_operations;
 
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index e64ecb9f2720..80464432dfe6 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -10,6 +10,7 @@
  *	Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com>
  */
 
+#include <linux/crash_core.h>
 #include <linux/mm.h>
 #include <linux/proc_fs.h>
 #include <linux/kcore.h>
@@ -49,32 +50,23 @@ static struct proc_dir_entry *proc_root_kcore;
 #define	kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET)
 #endif
 
-/* An ELF note in memory */
-struct memelfnote
-{
-	const char *name;
-	int type;
-	unsigned int datasz;
-	void *data;
-};
-
 static LIST_HEAD(kclist_head);
-static DEFINE_RWLOCK(kclist_lock);
+static DECLARE_RWSEM(kclist_lock);
 static int kcore_need_update = 1;
 
-void
-kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
+/* This doesn't grab kclist_lock, so it should only be used at init time. */
+void __init kclist_add(struct kcore_list *new, void *addr, size_t size,
+		       int type)
 {
 	new->addr = (unsigned long)addr;
 	new->size = size;
 	new->type = type;
 
-	write_lock(&kclist_lock);
 	list_add_tail(&new->list, &kclist_head);
-	write_unlock(&kclist_lock);
 }
 
-static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
+static size_t get_kcore_size(int *nphdr, size_t *phdrs_len, size_t *notes_len,
+			     size_t *data_offset)
 {
 	size_t try, size;
 	struct kcore_list *m;
@@ -88,53 +80,19 @@ static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
 			size = try;
 		*nphdr = *nphdr + 1;
 	}
-	*elf_buflen =	sizeof(struct elfhdr) + 
-			(*nphdr + 2)*sizeof(struct elf_phdr) + 
-			3 * ((sizeof(struct elf_note)) +
-			     roundup(sizeof(CORE_STR), 4)) +
-			roundup(sizeof(struct elf_prstatus), 4) +
-			roundup(sizeof(struct elf_prpsinfo), 4) +
-			roundup(arch_task_struct_size, 4);
-	*elf_buflen = PAGE_ALIGN(*elf_buflen);
-	return size + *elf_buflen;
-}
-
-static void free_kclist_ents(struct list_head *head)
-{
-	struct kcore_list *tmp, *pos;
 
-	list_for_each_entry_safe(pos, tmp, head, list) {
-		list_del(&pos->list);
-		kfree(pos);
-	}
+	*phdrs_len = *nphdr * sizeof(struct elf_phdr);
+	*notes_len = (4 * sizeof(struct elf_note) +
+		      3 * ALIGN(sizeof(CORE_STR), 4) +
+		      VMCOREINFO_NOTE_NAME_BYTES +
+		      ALIGN(sizeof(struct elf_prstatus), 4) +
+		      ALIGN(sizeof(struct elf_prpsinfo), 4) +
+		      ALIGN(arch_task_struct_size, 4) +
+		      ALIGN(vmcoreinfo_size, 4));
+	*data_offset = PAGE_ALIGN(sizeof(struct elfhdr) + *phdrs_len +
+				  *notes_len);
+	return *data_offset + size;
 }
-/*
- * Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list.
- */
-static void __kcore_update_ram(struct list_head *list)
-{
-	int nphdr;
-	size_t size;
-	struct kcore_list *tmp, *pos;
-	LIST_HEAD(garbage);
-
-	write_lock(&kclist_lock);
-	if (kcore_need_update) {
-		list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
-			if (pos->type == KCORE_RAM
-				|| pos->type == KCORE_VMEMMAP)
-				list_move(&pos->list, &garbage);
-		}
-		list_splice_tail(list, &kclist_head);
-	} else
-		list_splice(list, &garbage);
-	kcore_need_update = 0;
-	proc_root_kcore->size = get_kcore_size(&nphdr, &size);
-	write_unlock(&kclist_lock);
-
-	free_kclist_ents(&garbage);
-}
-
 
 #ifdef CONFIG_HIGHMEM
 /*
@@ -142,11 +100,9 @@ static void __kcore_update_ram(struct list_head *list)
  * because memory hole is not as big as !HIGHMEM case.
  * (HIGHMEM is special because part of memory is _invisible_ from the kernel.)
  */
-static int kcore_update_ram(void)
+static int kcore_ram_list(struct list_head *head)
 {
-	LIST_HEAD(head);
 	struct kcore_list *ent;
-	int ret = 0;
 
 	ent = kmalloc(sizeof(*ent), GFP_KERNEL);
 	if (!ent)
@@ -154,9 +110,8 @@ static int kcore_update_ram(void)
 	ent->addr = (unsigned long)__va(0);
 	ent->size = max_low_pfn << PAGE_SHIFT;
 	ent->type = KCORE_RAM;
-	list_add(&ent->list, &head);
-	__kcore_update_ram(&head);
-	return ret;
+	list_add(&ent->list, head);
+	return 0;
 }
 
 #else /* !CONFIG_HIGHMEM */
@@ -255,11 +210,10 @@ free_out:
 	return 1;
 }
 
-static int kcore_update_ram(void)
+static int kcore_ram_list(struct list_head *list)
 {
 	int nid, ret;
 	unsigned long end_pfn;
-	LIST_HEAD(head);
 
 	/* Not inialized....update now */
 	/* find out "max pfn" */
@@ -271,258 +225,255 @@ static int kcore_update_ram(void)
 			end_pfn = node_end;
 	}
 	/* scan 0 to max_pfn */
-	ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private);
-	if (ret) {
-		free_kclist_ents(&head);
+	ret = walk_system_ram_range(0, end_pfn, list, kclist_add_private);
+	if (ret)
 		return -ENOMEM;
-	}
-	__kcore_update_ram(&head);
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_HIGHMEM */
 
-/*****************************************************************************/
-/*
- * determine size of ELF note
- */
-static int notesize(struct memelfnote *en)
-{
-	int sz;
-
-	sz = sizeof(struct elf_note);
-	sz += roundup((strlen(en->name) + 1), 4);
-	sz += roundup(en->datasz, 4);
-
-	return sz;
-} /* end notesize() */
-
-/*****************************************************************************/
-/*
- * store a note in the header buffer
- */
-static char *storenote(struct memelfnote *men, char *bufp)
+static int kcore_update_ram(void)
 {
-	struct elf_note en;
-
-#define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0)
-
-	en.n_namesz = strlen(men->name) + 1;
-	en.n_descsz = men->datasz;
-	en.n_type = men->type;
-
-	DUMP_WRITE(&en, sizeof(en));
-	DUMP_WRITE(men->name, en.n_namesz);
-
-	/* XXX - cast from long long to long to avoid need for libgcc.a */
-	bufp = (char*) roundup((unsigned long)bufp,4);
-	DUMP_WRITE(men->data, men->datasz);
-	bufp = (char*) roundup((unsigned long)bufp,4);
-
-#undef DUMP_WRITE
-
-	return bufp;
-} /* end storenote() */
+	LIST_HEAD(list);
+	LIST_HEAD(garbage);
+	int nphdr;
+	size_t phdrs_len, notes_len, data_offset;
+	struct kcore_list *tmp, *pos;
+	int ret = 0;
 
-/*
- * store an ELF coredump header in the supplied buffer
- * nphdr is the number of elf_phdr to insert
- */
-static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
-{
-	struct elf_prstatus prstatus;	/* NT_PRSTATUS */
-	struct elf_prpsinfo prpsinfo;	/* NT_PRPSINFO */
-	struct elf_phdr *nhdr, *phdr;
-	struct elfhdr *elf;
-	struct memelfnote notes[3];
-	off_t offset = 0;
-	struct kcore_list *m;
+	down_write(&kclist_lock);
+	if (!xchg(&kcore_need_update, 0))
+		goto out;
 
-	/* setup ELF header */
-	elf = (struct elfhdr *) bufp;
-	bufp += sizeof(struct elfhdr);
-	offset += sizeof(struct elfhdr);
-	memcpy(elf->e_ident, ELFMAG, SELFMAG);
-	elf->e_ident[EI_CLASS]	= ELF_CLASS;
-	elf->e_ident[EI_DATA]	= ELF_DATA;
-	elf->e_ident[EI_VERSION]= EV_CURRENT;
-	elf->e_ident[EI_OSABI] = ELF_OSABI;
-	memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
-	elf->e_type	= ET_CORE;
-	elf->e_machine	= ELF_ARCH;
-	elf->e_version	= EV_CURRENT;
-	elf->e_entry	= 0;
-	elf->e_phoff	= sizeof(struct elfhdr);
-	elf->e_shoff	= 0;
-	elf->e_flags	= ELF_CORE_EFLAGS;
-	elf->e_ehsize	= sizeof(struct elfhdr);
-	elf->e_phentsize= sizeof(struct elf_phdr);
-	elf->e_phnum	= nphdr;
-	elf->e_shentsize= 0;
-	elf->e_shnum	= 0;
-	elf->e_shstrndx	= 0;
-
-	/* setup ELF PT_NOTE program header */
-	nhdr = (struct elf_phdr *) bufp;
-	bufp += sizeof(struct elf_phdr);
-	offset += sizeof(struct elf_phdr);
-	nhdr->p_type	= PT_NOTE;
-	nhdr->p_offset	= 0;
-	nhdr->p_vaddr	= 0;
-	nhdr->p_paddr	= 0;
-	nhdr->p_filesz	= 0;
-	nhdr->p_memsz	= 0;
-	nhdr->p_flags	= 0;
-	nhdr->p_align	= 0;
-
-	/* setup ELF PT_LOAD program header for every area */
-	list_for_each_entry(m, &kclist_head, list) {
-		phdr = (struct elf_phdr *) bufp;
-		bufp += sizeof(struct elf_phdr);
-		offset += sizeof(struct elf_phdr);
-
-		phdr->p_type	= PT_LOAD;
-		phdr->p_flags	= PF_R|PF_W|PF_X;
-		phdr->p_offset	= kc_vaddr_to_offset(m->addr) + dataoff;
-		phdr->p_vaddr	= (size_t)m->addr;
-		if (m->type == KCORE_RAM || m->type == KCORE_TEXT)
-			phdr->p_paddr	= __pa(m->addr);
-		else
-			phdr->p_paddr	= (elf_addr_t)-1;
-		phdr->p_filesz	= phdr->p_memsz	= m->size;
-		phdr->p_align	= PAGE_SIZE;
+	ret = kcore_ram_list(&list);
+	if (ret) {
+		/* Couldn't get the RAM list, try again next time. */
+		WRITE_ONCE(kcore_need_update, 1);
+		list_splice_tail(&list, &garbage);
+		goto out;
 	}
 
-	/*
-	 * Set up the notes in similar form to SVR4 core dumps made
-	 * with info from their /proc.
-	 */
-	nhdr->p_offset	= offset;
-
-	/* set up the process status */
-	notes[0].name = CORE_STR;
-	notes[0].type = NT_PRSTATUS;
-	notes[0].datasz = sizeof(struct elf_prstatus);
-	notes[0].data = &prstatus;
-
-	memset(&prstatus, 0, sizeof(struct elf_prstatus));
-
-	nhdr->p_filesz	= notesize(&notes[0]);
-	bufp = storenote(&notes[0], bufp);
-
-	/* set up the process info */
-	notes[1].name	= CORE_STR;
-	notes[1].type	= NT_PRPSINFO;
-	notes[1].datasz	= sizeof(struct elf_prpsinfo);
-	notes[1].data	= &prpsinfo;
-
-	memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo));
-	prpsinfo.pr_state	= 0;
-	prpsinfo.pr_sname	= 'R';
-	prpsinfo.pr_zomb	= 0;
-
-	strcpy(prpsinfo.pr_fname, "vmlinux");
-	strlcpy(prpsinfo.pr_psargs, saved_command_line, sizeof(prpsinfo.pr_psargs));
-
-	nhdr->p_filesz	+= notesize(&notes[1]);
-	bufp = storenote(&notes[1], bufp);
+	list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
+		if (pos->type == KCORE_RAM || pos->type == KCORE_VMEMMAP)
+			list_move(&pos->list, &garbage);
+	}
+	list_splice_tail(&list, &kclist_head);
 
-	/* set up the task structure */
-	notes[2].name	= CORE_STR;
-	notes[2].type	= NT_TASKSTRUCT;
-	notes[2].datasz	= arch_task_struct_size;
-	notes[2].data	= current;
+	proc_root_kcore->size = get_kcore_size(&nphdr, &phdrs_len, &notes_len,
+					       &data_offset);
 
-	nhdr->p_filesz	+= notesize(&notes[2]);
-	bufp = storenote(&notes[2], bufp);
+out:
+	up_write(&kclist_lock);
+	list_for_each_entry_safe(pos, tmp, &garbage, list) {
+		list_del(&pos->list);
+		kfree(pos);
+	}
+	return ret;
+}
 
-} /* end elf_kcore_store_hdr() */
+static void append_kcore_note(char *notes, size_t *i, const char *name,
+			      unsigned int type, const void *desc,
+			      size_t descsz)
+{
+	struct elf_note *note = (struct elf_note *)&notes[*i];
+
+	note->n_namesz = strlen(name) + 1;
+	note->n_descsz = descsz;
+	note->n_type = type;
+	*i += sizeof(*note);
+	memcpy(&notes[*i], name, note->n_namesz);
+	*i = ALIGN(*i + note->n_namesz, 4);
+	memcpy(&notes[*i], desc, descsz);
+	*i = ALIGN(*i + descsz, 4);
+}
 
-/*****************************************************************************/
-/*
- * read from the ELF header and then kernel memory
- */
 static ssize_t
 read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
 {
 	char *buf = file->private_data;
-	ssize_t acc = 0;
-	size_t size, tsz;
-	size_t elf_buflen;
+	size_t phdrs_offset, notes_offset, data_offset;
+	size_t phdrs_len, notes_len;
+	struct kcore_list *m;
+	size_t tsz;
 	int nphdr;
 	unsigned long start;
+	size_t orig_buflen = buflen;
+	int ret = 0;
 
-	read_lock(&kclist_lock);
-	size = get_kcore_size(&nphdr, &elf_buflen);
+	down_read(&kclist_lock);
+
+	get_kcore_size(&nphdr, &phdrs_len, &notes_len, &data_offset);
+	phdrs_offset = sizeof(struct elfhdr);
+	notes_offset = phdrs_offset + phdrs_len;
+
+	/* ELF file header. */
+	if (buflen && *fpos < sizeof(struct elfhdr)) {
+		struct elfhdr ehdr = {
+			.e_ident = {
+				[EI_MAG0] = ELFMAG0,
+				[EI_MAG1] = ELFMAG1,
+				[EI_MAG2] = ELFMAG2,
+				[EI_MAG3] = ELFMAG3,
+				[EI_CLASS] = ELF_CLASS,
+				[EI_DATA] = ELF_DATA,
+				[EI_VERSION] = EV_CURRENT,
+				[EI_OSABI] = ELF_OSABI,
+			},
+			.e_type = ET_CORE,
+			.e_machine = ELF_ARCH,
+			.e_version = EV_CURRENT,
+			.e_phoff = sizeof(struct elfhdr),
+			.e_flags = ELF_CORE_EFLAGS,
+			.e_ehsize = sizeof(struct elfhdr),
+			.e_phentsize = sizeof(struct elf_phdr),
+			.e_phnum = nphdr,
+		};
+
+		tsz = min_t(size_t, buflen, sizeof(struct elfhdr) - *fpos);
+		if (copy_to_user(buffer, (char *)&ehdr + *fpos, tsz)) {
+			ret = -EFAULT;
+			goto out;
+		}
 
-	if (buflen == 0 || *fpos >= size) {
-		read_unlock(&kclist_lock);
-		return 0;
+		buffer += tsz;
+		buflen -= tsz;
+		*fpos += tsz;
 	}
 
-	/* trim buflen to not go beyond EOF */
-	if (buflen > size - *fpos)
-		buflen = size - *fpos;
-
-	/* construct an ELF core header if we'll need some of it */
-	if (*fpos < elf_buflen) {
-		char * elf_buf;
-
-		tsz = elf_buflen - *fpos;
-		if (buflen < tsz)
-			tsz = buflen;
-		elf_buf = kzalloc(elf_buflen, GFP_ATOMIC);
-		if (!elf_buf) {
-			read_unlock(&kclist_lock);
-			return -ENOMEM;
+	/* ELF program headers. */
+	if (buflen && *fpos < phdrs_offset + phdrs_len) {
+		struct elf_phdr *phdrs, *phdr;
+
+		phdrs = kzalloc(phdrs_len, GFP_KERNEL);
+		if (!phdrs) {
+			ret = -ENOMEM;
+			goto out;
 		}
-		elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen);
-		read_unlock(&kclist_lock);
-		if (copy_to_user(buffer, elf_buf + *fpos, tsz)) {
-			kfree(elf_buf);
-			return -EFAULT;
+
+		phdrs[0].p_type = PT_NOTE;
+		phdrs[0].p_offset = notes_offset;
+		phdrs[0].p_filesz = notes_len;
+
+		phdr = &phdrs[1];
+		list_for_each_entry(m, &kclist_head, list) {
+			phdr->p_type = PT_LOAD;
+			phdr->p_flags = PF_R | PF_W | PF_X;
+			phdr->p_offset = kc_vaddr_to_offset(m->addr) + data_offset;
+			phdr->p_vaddr = (size_t)m->addr;
+			if (m->type == KCORE_RAM)
+				phdr->p_paddr = __pa(m->addr);
+			else if (m->type == KCORE_TEXT)
+				phdr->p_paddr = __pa_symbol(m->addr);
+			else
+				phdr->p_paddr = (elf_addr_t)-1;
+			phdr->p_filesz = phdr->p_memsz = m->size;
+			phdr->p_align = PAGE_SIZE;
+			phdr++;
 		}
-		kfree(elf_buf);
+
+		tsz = min_t(size_t, buflen, phdrs_offset + phdrs_len - *fpos);
+		if (copy_to_user(buffer, (char *)phdrs + *fpos - phdrs_offset,
+				 tsz)) {
+			kfree(phdrs);
+			ret = -EFAULT;
+			goto out;
+		}
+		kfree(phdrs);
+
+		buffer += tsz;
 		buflen -= tsz;
 		*fpos += tsz;
-		buffer += tsz;
-		acc += tsz;
+	}
+
+	/* ELF note segment. */
+	if (buflen && *fpos < notes_offset + notes_len) {
+		struct elf_prstatus prstatus = {};
+		struct elf_prpsinfo prpsinfo = {
+			.pr_sname = 'R',
+			.pr_fname = "vmlinux",
+		};
+		char *notes;
+		size_t i = 0;
+
+		strlcpy(prpsinfo.pr_psargs, saved_command_line,
+			sizeof(prpsinfo.pr_psargs));
+
+		notes = kzalloc(notes_len, GFP_KERNEL);
+		if (!notes) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		append_kcore_note(notes, &i, CORE_STR, NT_PRSTATUS, &prstatus,
+				  sizeof(prstatus));
+		append_kcore_note(notes, &i, CORE_STR, NT_PRPSINFO, &prpsinfo,
+				  sizeof(prpsinfo));
+		append_kcore_note(notes, &i, CORE_STR, NT_TASKSTRUCT, current,
+				  arch_task_struct_size);
+		/*
+		 * vmcoreinfo_size is mostly constant after init time, but it
+		 * can be changed by crash_save_vmcoreinfo(). Racing here with a
+		 * panic on another CPU before the machine goes down is insanely
+		 * unlikely, but it's better to not leave potential buffer
+		 * overflows lying around, regardless.
+		 */
+		append_kcore_note(notes, &i, VMCOREINFO_NOTE_NAME, 0,
+				  vmcoreinfo_data,
+				  min(vmcoreinfo_size, notes_len - i));
+
+		tsz = min_t(size_t, buflen, notes_offset + notes_len - *fpos);
+		if (copy_to_user(buffer, notes + *fpos - notes_offset, tsz)) {
+			kfree(notes);
+			ret = -EFAULT;
+			goto out;
+		}
+		kfree(notes);
 
-		/* leave now if filled buffer already */
-		if (buflen == 0)
-			return acc;
-	} else
-		read_unlock(&kclist_lock);
+		buffer += tsz;
+		buflen -= tsz;
+		*fpos += tsz;
+	}
 
 	/*
 	 * Check to see if our file offset matches with any of
 	 * the addresses in the elf_phdr on our list.
 	 */
-	start = kc_offset_to_vaddr(*fpos - elf_buflen);
+	start = kc_offset_to_vaddr(*fpos - data_offset);
 	if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
 		tsz = buflen;
-		
-	while (buflen) {
-		struct kcore_list *m;
 
-		read_lock(&kclist_lock);
-		list_for_each_entry(m, &kclist_head, list) {
-			if (start >= m->addr && start < (m->addr+m->size))
-				break;
+	m = NULL;
+	while (buflen) {
+		/*
+		 * If this is the first iteration or the address is not within
+		 * the previous entry, search for a matching entry.
+		 */
+		if (!m || start < m->addr || start >= m->addr + m->size) {
+			list_for_each_entry(m, &kclist_head, list) {
+				if (start >= m->addr &&
+				    start < m->addr + m->size)
+					break;
+			}
 		}
-		read_unlock(&kclist_lock);
 
 		if (&m->list == &kclist_head) {
-			if (clear_user(buffer, tsz))
-				return -EFAULT;
+			if (clear_user(buffer, tsz)) {
+				ret = -EFAULT;
+				goto out;
+			}
 		} else if (m->type == KCORE_VMALLOC) {
 			vread(buf, (char *)start, tsz);
 			/* we have to zero-fill user buffer even if no read */
-			if (copy_to_user(buffer, buf, tsz))
-				return -EFAULT;
+			if (copy_to_user(buffer, buf, tsz)) {
+				ret = -EFAULT;
+				goto out;
+			}
 		} else if (m->type == KCORE_USER) {
 			/* User page is handled prior to normal kernel page: */
-			if (copy_to_user(buffer, (char *)start, tsz))
-				return -EFAULT;
+			if (copy_to_user(buffer, (char *)start, tsz)) {
+				ret = -EFAULT;
+				goto out;
+			}
 		} else {
 			if (kern_addr_valid(start)) {
 				/*
@@ -530,29 +481,37 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
 				 * hardened user copy kernel text checks.
 				 */
 				if (probe_kernel_read(buf, (void *) start, tsz)) {
-					if (clear_user(buffer, tsz))
-						return -EFAULT;
+					if (clear_user(buffer, tsz)) {
+						ret = -EFAULT;
+						goto out;
+					}
 				} else {
-					if (copy_to_user(buffer, buf, tsz))
-						return -EFAULT;
+					if (copy_to_user(buffer, buf, tsz)) {
+						ret = -EFAULT;
+						goto out;
+					}
 				}
 			} else {
-				if (clear_user(buffer, tsz))
-					return -EFAULT;
+				if (clear_user(buffer, tsz)) {
+					ret = -EFAULT;
+					goto out;
+				}
 			}
 		}
 		buflen -= tsz;
 		*fpos += tsz;
 		buffer += tsz;
-		acc += tsz;
 		start += tsz;
 		tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
 	}
 
-	return acc;
+out:
+	up_read(&kclist_lock);
+	if (ret)
+		return ret;
+	return orig_buflen - buflen;
 }
 
-
 static int open_kcore(struct inode *inode, struct file *filp)
 {
 	if (!capable(CAP_SYS_RAWIO))
@@ -592,9 +551,8 @@ static int __meminit kcore_callback(struct notifier_block *self,
 	switch (action) {
 	case MEM_ONLINE:
 	case MEM_OFFLINE:
-		write_lock(&kclist_lock);
 		kcore_need_update = 1;
-		write_unlock(&kclist_lock);
+		break;
 	}
 	return NOTIFY_OK;
 }
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 2fb04846ed11..edda898714eb 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -7,6 +7,7 @@
 #include <linux/mman.h>
 #include <linux/mmzone.h>
 #include <linux/proc_fs.h>
+#include <linux/percpu.h>
 #include <linux/quicklist.h>
 #include <linux/seq_file.h>
 #include <linux/swap.h>
@@ -121,6 +122,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		   (unsigned long)VMALLOC_TOTAL >> 10);
 	show_val_kb(m, "VmallocUsed:    ", 0ul);
 	show_val_kb(m, "VmallocChunk:   ", 0ul);
+	show_val_kb(m, "Percpu:         ", pcpu_nr_pages());
 
 #ifdef CONFIG_MEMORY_FAILURE
 	seq_printf(m, "HardwareCorrupted: %5lu kB\n",
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 59749dfaef67..535eda7857cf 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -183,7 +183,7 @@ static int show_stat(struct seq_file *p, void *v)
 
 static int stat_open(struct inode *inode, struct file *file)
 {
-	size_t size = 1024 + 128 * num_online_cpus();
+	unsigned int size = 1024 + 128 * num_online_cpus();
 
 	/* minimum size to display an interrupt count : 2 bytes */
 	size += 2 * nr_irqs;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index dfd73a4616ce..5ea1d64cb0b4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -247,7 +247,6 @@ static int proc_map_release(struct inode *inode, struct file *file)
 	if (priv->mm)
 		mmdrop(priv->mm);
 
-	kfree(priv->rollup);
 	return seq_release_private(inode, file);
 }
 
@@ -294,7 +293,7 @@ static void show_vma_header_prefix(struct seq_file *m,
 }
 
 static void
-show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
+show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
 {
 	struct mm_struct *mm = vma->vm_mm;
 	struct file *file = vma->vm_file;
@@ -357,35 +356,18 @@ done:
 	seq_putc(m, '\n');
 }
 
-static int show_map(struct seq_file *m, void *v, int is_pid)
+static int show_map(struct seq_file *m, void *v)
 {
-	show_map_vma(m, v, is_pid);
+	show_map_vma(m, v);
 	m_cache_vma(m, v);
 	return 0;
 }
 
-static int show_pid_map(struct seq_file *m, void *v)
-{
-	return show_map(m, v, 1);
-}
-
-static int show_tid_map(struct seq_file *m, void *v)
-{
-	return show_map(m, v, 0);
-}
-
 static const struct seq_operations proc_pid_maps_op = {
 	.start	= m_start,
 	.next	= m_next,
 	.stop	= m_stop,
-	.show	= show_pid_map
-};
-
-static const struct seq_operations proc_tid_maps_op = {
-	.start	= m_start,
-	.next	= m_next,
-	.stop	= m_stop,
-	.show	= show_tid_map
+	.show	= show_map
 };
 
 static int pid_maps_open(struct inode *inode, struct file *file)
@@ -393,11 +375,6 @@ static int pid_maps_open(struct inode *inode, struct file *file)
 	return do_maps_open(inode, file, &proc_pid_maps_op);
 }
 
-static int tid_maps_open(struct inode *inode, struct file *file)
-{
-	return do_maps_open(inode, file, &proc_tid_maps_op);
-}
-
 const struct file_operations proc_pid_maps_operations = {
 	.open		= pid_maps_open,
 	.read		= seq_read,
@@ -405,13 +382,6 @@ const struct file_operations proc_pid_maps_operations = {
 	.release	= proc_map_release,
 };
 
-const struct file_operations proc_tid_maps_operations = {
-	.open		= tid_maps_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= proc_map_release,
-};
-
 /*
  * Proportional Set Size(PSS): my share of RSS.
  *
@@ -433,7 +403,6 @@ const struct file_operations proc_tid_maps_operations = {
 
 #ifdef CONFIG_PROC_PAGE_MONITOR
 struct mem_size_stats {
-	bool first;
 	unsigned long resident;
 	unsigned long shared_clean;
 	unsigned long shared_dirty;
@@ -447,7 +416,6 @@ struct mem_size_stats {
 	unsigned long swap;
 	unsigned long shared_hugetlb;
 	unsigned long private_hugetlb;
-	unsigned long first_vma_start;
 	u64 pss;
 	u64 pss_locked;
 	u64 swap_pss;
@@ -731,14 +699,9 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
 }
 #endif /* HUGETLB_PAGE */
 
-#define SEQ_PUT_DEC(str, val) \
-		seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
-static int show_smap(struct seq_file *m, void *v, int is_pid)
+static void smap_gather_stats(struct vm_area_struct *vma,
+			     struct mem_size_stats *mss)
 {
-	struct proc_maps_private *priv = m->private;
-	struct vm_area_struct *vma = v;
-	struct mem_size_stats mss_stack;
-	struct mem_size_stats *mss;
 	struct mm_walk smaps_walk = {
 		.pmd_entry = smaps_pte_range,
 #ifdef CONFIG_HUGETLB_PAGE
@@ -746,23 +709,6 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 #endif
 		.mm = vma->vm_mm,
 	};
-	int ret = 0;
-	bool rollup_mode;
-	bool last_vma;
-
-	if (priv->rollup) {
-		rollup_mode = true;
-		mss = priv->rollup;
-		if (mss->first) {
-			mss->first_vma_start = vma->vm_start;
-			mss->first = false;
-		}
-		last_vma = !m_next_vma(priv, vma);
-	} else {
-		rollup_mode = false;
-		memset(&mss_stack, 0, sizeof(mss_stack));
-		mss = &mss_stack;
-	}
 
 	smaps_walk.private = mss;
 
@@ -794,79 +740,116 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 	walk_page_vma(vma, &smaps_walk);
 	if (vma->vm_flags & VM_LOCKED)
 		mss->pss_locked += mss->pss;
+}
 
-	if (!rollup_mode) {
-		show_map_vma(m, vma, is_pid);
-	} else if (last_vma) {
-		show_vma_header_prefix(
-			m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0);
-		seq_pad(m, ' ');
-		seq_puts(m, "[rollup]\n");
-	} else {
-		ret = SEQ_SKIP;
-	}
-
-	if (!rollup_mode) {
-		SEQ_PUT_DEC("Size:           ", vma->vm_end - vma->vm_start);
-		SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma));
-		SEQ_PUT_DEC(" kB\nMMUPageSize:    ", vma_mmu_pagesize(vma));
-		seq_puts(m, " kB\n");
-	}
+#define SEQ_PUT_DEC(str, val) \
+		seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
 
-	if (!rollup_mode || last_vma) {
-		SEQ_PUT_DEC("Rss:            ", mss->resident);
-		SEQ_PUT_DEC(" kB\nPss:            ", mss->pss >> PSS_SHIFT);
-		SEQ_PUT_DEC(" kB\nShared_Clean:   ", mss->shared_clean);
-		SEQ_PUT_DEC(" kB\nShared_Dirty:   ", mss->shared_dirty);
-		SEQ_PUT_DEC(" kB\nPrivate_Clean:  ", mss->private_clean);
-		SEQ_PUT_DEC(" kB\nPrivate_Dirty:  ", mss->private_dirty);
-		SEQ_PUT_DEC(" kB\nReferenced:     ", mss->referenced);
-		SEQ_PUT_DEC(" kB\nAnonymous:      ", mss->anonymous);
-		SEQ_PUT_DEC(" kB\nLazyFree:       ", mss->lazyfree);
-		SEQ_PUT_DEC(" kB\nAnonHugePages:  ", mss->anonymous_thp);
-		SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp);
-		SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb);
-		seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ",
-					  mss->private_hugetlb >> 10, 7);
-		SEQ_PUT_DEC(" kB\nSwap:           ", mss->swap);
-		SEQ_PUT_DEC(" kB\nSwapPss:        ",
-						mss->swap_pss >> PSS_SHIFT);
-		SEQ_PUT_DEC(" kB\nLocked:         ",
-						mss->pss_locked >> PSS_SHIFT);
-		seq_puts(m, " kB\n");
-	}
-	if (!rollup_mode) {
-		if (arch_pkeys_enabled())
-			seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
-		show_smap_vma_flags(m, vma);
-	}
-	m_cache_vma(m, vma);
-	return ret;
+/* Show the contents common for smaps and smaps_rollup */
+static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss)
+{
+	SEQ_PUT_DEC("Rss:            ", mss->resident);
+	SEQ_PUT_DEC(" kB\nPss:            ", mss->pss >> PSS_SHIFT);
+	SEQ_PUT_DEC(" kB\nShared_Clean:   ", mss->shared_clean);
+	SEQ_PUT_DEC(" kB\nShared_Dirty:   ", mss->shared_dirty);
+	SEQ_PUT_DEC(" kB\nPrivate_Clean:  ", mss->private_clean);
+	SEQ_PUT_DEC(" kB\nPrivate_Dirty:  ", mss->private_dirty);
+	SEQ_PUT_DEC(" kB\nReferenced:     ", mss->referenced);
+	SEQ_PUT_DEC(" kB\nAnonymous:      ", mss->anonymous);
+	SEQ_PUT_DEC(" kB\nLazyFree:       ", mss->lazyfree);
+	SEQ_PUT_DEC(" kB\nAnonHugePages:  ", mss->anonymous_thp);
+	SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp);
+	SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb);
+	seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ",
+				  mss->private_hugetlb >> 10, 7);
+	SEQ_PUT_DEC(" kB\nSwap:           ", mss->swap);
+	SEQ_PUT_DEC(" kB\nSwapPss:        ",
+					mss->swap_pss >> PSS_SHIFT);
+	SEQ_PUT_DEC(" kB\nLocked:         ",
+					mss->pss_locked >> PSS_SHIFT);
+	seq_puts(m, " kB\n");
 }
-#undef SEQ_PUT_DEC
 
-static int show_pid_smap(struct seq_file *m, void *v)
+static int show_smap(struct seq_file *m, void *v)
 {
-	return show_smap(m, v, 1);
+	struct vm_area_struct *vma = v;
+	struct mem_size_stats mss;
+
+	memset(&mss, 0, sizeof(mss));
+
+	smap_gather_stats(vma, &mss);
+
+	show_map_vma(m, vma);
+
+	SEQ_PUT_DEC("Size:           ", vma->vm_end - vma->vm_start);
+	SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma));
+	SEQ_PUT_DEC(" kB\nMMUPageSize:    ", vma_mmu_pagesize(vma));
+	seq_puts(m, " kB\n");
+
+	__show_smap(m, &mss);
+
+	if (arch_pkeys_enabled())
+		seq_printf(m, "ProtectionKey:  %8u\n", vma_pkey(vma));
+	show_smap_vma_flags(m, vma);
+
+	m_cache_vma(m, vma);
+
+	return 0;
 }
 
-static int show_tid_smap(struct seq_file *m, void *v)
+static int show_smaps_rollup(struct seq_file *m, void *v)
 {
-	return show_smap(m, v, 0);
+	struct proc_maps_private *priv = m->private;
+	struct mem_size_stats mss;
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;
+	unsigned long last_vma_end = 0;
+	int ret = 0;
+
+	priv->task = get_proc_task(priv->inode);
+	if (!priv->task)
+		return -ESRCH;
+
+	mm = priv->mm;
+	if (!mm || !mmget_not_zero(mm)) {
+		ret = -ESRCH;
+		goto out_put_task;
+	}
+
+	memset(&mss, 0, sizeof(mss));
+
+	down_read(&mm->mmap_sem);
+	hold_task_mempolicy(priv);
+
+	for (vma = priv->mm->mmap; vma; vma = vma->vm_next) {
+		smap_gather_stats(vma, &mss);
+		last_vma_end = vma->vm_end;
+	}
+
+	show_vma_header_prefix(m, priv->mm->mmap->vm_start,
+			       last_vma_end, 0, 0, 0, 0);
+	seq_pad(m, ' ');
+	seq_puts(m, "[rollup]\n");
+
+	__show_smap(m, &mss);
+
+	release_task_mempolicy(priv);
+	up_read(&mm->mmap_sem);
+	mmput(mm);
+
+out_put_task:
+	put_task_struct(priv->task);
+	priv->task = NULL;
+
+	return ret;
 }
+#undef SEQ_PUT_DEC
 
 static const struct seq_operations proc_pid_smaps_op = {
 	.start	= m_start,
 	.next	= m_next,
 	.stop	= m_stop,
-	.show	= show_pid_smap
-};
-
-static const struct seq_operations proc_tid_smaps_op = {
-	.start	= m_start,
-	.next	= m_next,
-	.stop	= m_stop,
-	.show	= show_tid_smap
+	.show	= show_smap
 };
 
 static int pid_smaps_open(struct inode *inode, struct file *file)
@@ -874,28 +857,45 @@ static int pid_smaps_open(struct inode *inode, struct file *file)
 	return do_maps_open(inode, file, &proc_pid_smaps_op);
 }
 
-static int pid_smaps_rollup_open(struct inode *inode, struct file *file)
+static int smaps_rollup_open(struct inode *inode, struct file *file)
 {
-	struct seq_file *seq;
+	int ret;
 	struct proc_maps_private *priv;
-	int ret = do_maps_open(inode, file, &proc_pid_smaps_op);
-
-	if (ret < 0)
-		return ret;
-	seq = file->private_data;
-	priv = seq->private;
-	priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL);
-	if (!priv->rollup) {
-		proc_map_release(inode, file);
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT);
+	if (!priv)
 		return -ENOMEM;
+
+	ret = single_open(file, show_smaps_rollup, priv);
+	if (ret)
+		goto out_free;
+
+	priv->inode = inode;
+	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
+	if (IS_ERR(priv->mm)) {
+		ret = PTR_ERR(priv->mm);
+
+		single_release(inode, file);
+		goto out_free;
 	}
-	priv->rollup->first = true;
+
 	return 0;
+
+out_free:
+	kfree(priv);
+	return ret;
 }
 
-static int tid_smaps_open(struct inode *inode, struct file *file)
+static int smaps_rollup_release(struct inode *inode, struct file *file)
 {
-	return do_maps_open(inode, file, &proc_tid_smaps_op);
+	struct seq_file *seq = file->private_data;
+	struct proc_maps_private *priv = seq->private;
+
+	if (priv->mm)
+		mmdrop(priv->mm);
+
+	kfree(priv);
+	return single_release(inode, file);
 }
 
 const struct file_operations proc_pid_smaps_operations = {
@@ -906,17 +906,10 @@ const struct file_operations proc_pid_smaps_operations = {
 };
 
 const struct file_operations proc_pid_smaps_rollup_operations = {
-	.open		= pid_smaps_rollup_open,
+	.open		= smaps_rollup_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= proc_map_release,
-};
-
-const struct file_operations proc_tid_smaps_operations = {
-	.open		= tid_smaps_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= proc_map_release,
+	.release	= smaps_rollup_release,
 };
 
 enum clear_refs_types {
@@ -1728,7 +1721,7 @@ static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
 /*
  * Display pages allocated per node and memory policy via /proc.
  */
-static int show_numa_map(struct seq_file *m, void *v, int is_pid)
+static int show_numa_map(struct seq_file *m, void *v)
 {
 	struct numa_maps_private *numa_priv = m->private;
 	struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
@@ -1812,45 +1805,17 @@ out:
 	return 0;
 }
 
-static int show_pid_numa_map(struct seq_file *m, void *v)
-{
-	return show_numa_map(m, v, 1);
-}
-
-static int show_tid_numa_map(struct seq_file *m, void *v)
-{
-	return show_numa_map(m, v, 0);
-}
-
 static const struct seq_operations proc_pid_numa_maps_op = {
 	.start  = m_start,
 	.next   = m_next,
 	.stop   = m_stop,
-	.show   = show_pid_numa_map,
+	.show   = show_numa_map,
 };
 
-static const struct seq_operations proc_tid_numa_maps_op = {
-	.start  = m_start,
-	.next   = m_next,
-	.stop   = m_stop,
-	.show   = show_tid_numa_map,
-};
-
-static int numa_maps_open(struct inode *inode, struct file *file,
-			  const struct seq_operations *ops)
-{
-	return proc_maps_open(inode, file, ops,
-				sizeof(struct numa_maps_private));
-}
-
 static int pid_numa_maps_open(struct inode *inode, struct file *file)
 {
-	return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
-}
-
-static int tid_numa_maps_open(struct inode *inode, struct file *file)
-{
-	return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
+	return proc_maps_open(inode, file, &proc_pid_numa_maps_op,
+				sizeof(struct numa_maps_private));
 }
 
 const struct file_operations proc_pid_numa_maps_operations = {
@@ -1860,10 +1825,4 @@ const struct file_operations proc_pid_numa_maps_operations = {
 	.release	= proc_map_release,
 };
 
-const struct file_operations proc_tid_numa_maps_operations = {
-	.open		= tid_numa_maps_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= proc_map_release,
-};
 #endif /* CONFIG_NUMA */
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 5b62f57bd9bc..0b63d68dedb2 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -142,8 +142,7 @@ static int is_stack(struct vm_area_struct *vma)
 /*
  * display a single VMA to a sequenced file
  */
-static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
-			  int is_pid)
+static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
 {
 	struct mm_struct *mm = vma->vm_mm;
 	unsigned long ino = 0;
@@ -189,22 +188,11 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
 /*
  * display mapping lines for a particular process's /proc/pid/maps
  */
-static int show_map(struct seq_file *m, void *_p, int is_pid)
+static int show_map(struct seq_file *m, void *_p)
 {
 	struct rb_node *p = _p;
 
-	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
-			      is_pid);
-}
-
-static int show_pid_map(struct seq_file *m, void *_p)
-{
-	return show_map(m, _p, 1);
-}
-
-static int show_tid_map(struct seq_file *m, void *_p)
-{
-	return show_map(m, _p, 0);
+	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
 }
 
 static void *m_start(struct seq_file *m, loff_t *pos)
@@ -260,14 +248,7 @@ static const struct seq_operations proc_pid_maps_ops = {
 	.start	= m_start,
 	.next	= m_next,
 	.stop	= m_stop,
-	.show	= show_pid_map
-};
-
-static const struct seq_operations proc_tid_maps_ops = {
-	.start	= m_start,
-	.next	= m_next,
-	.stop	= m_stop,
-	.show	= show_tid_map
+	.show	= show_map
 };
 
 static int maps_open(struct inode *inode, struct file *file,
@@ -308,11 +289,6 @@ static int pid_maps_open(struct inode *inode, struct file *file)
 	return maps_open(inode, file, &proc_pid_maps_ops);
 }
 
-static int tid_maps_open(struct inode *inode, struct file *file)
-{
-	return maps_open(inode, file, &proc_tid_maps_ops);
-}
-
 const struct file_operations proc_pid_maps_operations = {
 	.open		= pid_maps_open,
 	.read		= seq_read,
@@ -320,10 +296,3 @@ const struct file_operations proc_pid_maps_operations = {
 	.release	= map_release,
 };
 
-const struct file_operations proc_tid_maps_operations = {
-	.open		= tid_maps_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= map_release,
-};
-
diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 3f723cb478af..a4c2791ab70b 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -9,7 +9,7 @@
 
 static int uptime_proc_show(struct seq_file *m, void *v)
 {
-	struct timespec uptime;
+	struct timespec64 uptime;
 	struct timespec64 idle;
 	u64 nsec;
 	u32 rem;
@@ -19,7 +19,7 @@ static int uptime_proc_show(struct seq_file *m, void *v)
 	for_each_possible_cpu(i)
 		nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
 
-	get_monotonic_boottime(&uptime);
+	ktime_get_boottime_ts64(&uptime);
 	idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 	idle.tv_nsec = rem;
 	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index cfb6674331fd..6c1c2607e9e4 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -379,7 +379,7 @@ static ssize_t read_vmcore(struct file *file, char __user *buffer,
  * On s390 the fault handler is used for memory regions that can't be mapped
  * directly with remap_pfn_range().
  */
-static int mmap_vmcore_fault(struct vm_fault *vmf)
+static vm_fault_t mmap_vmcore_fault(struct vm_fault *vmf)
 {
 #ifdef CONFIG_S390
 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;