Merge branch 'akpm' (patches from Andrew)

Merge second patchbomb from Andrew Morton:

 - the rest of MM

 - various misc bits

 - add ability to run /sbin/reboot at reboot time

 - printk/vsprintf changes

 - fiddle with seq_printf() return value

* akpm: (114 commits)
  parisc: remove use of seq_printf return value
  lru_cache: remove use of seq_printf return value
  tracing: remove use of seq_printf return value
  cgroup: remove use of seq_printf return value
  proc: remove use of seq_printf return value
  s390: remove use of seq_printf return value
  cris fasttimer: remove use of seq_printf return value
  cris: remove use of seq_printf return value
  openrisc: remove use of seq_printf return value
  ARM: plat-pxa: remove use of seq_printf return value
  nios2: cpuinfo: remove use of seq_printf return value
  microblaze: mb: remove use of seq_printf return value
  ipc: remove use of seq_printf return value
  rtc: remove use of seq_printf return value
  power: wakeup: remove use of seq_printf return value
  x86: mtrr: if: remove use of seq_printf return value
  linux/bitmap.h: improve BITMAP_{LAST,FIRST}_WORD_MASK
  MAINTAINERS: CREDITS: remove Stefano Brivio from B43
  .mailmap: add Ricardo Ribalda
  CREDITS: add Ricardo Ribalda Delgado
  ...

17 files changed, 183 insertions, 138 deletions

diff --git a/fs/dax.c b/fs/dax.c
index ed1619ec6537..d0bd1f4f81b3 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -464,6 +464,23 @@ int dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
 EXPORT_SYMBOL_GPL(dax_fault);
 
 /**
+ * dax_pfn_mkwrite - handle first write to DAX page
+ * @vma: The virtual memory area where the fault occurred
+ * @vmf: The description of the fault
+ *
+ */
+int dax_pfn_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+        struct super_block *sb = file_inode(vma->vm_file)->i_sb;
+
+        sb_start_pagefault(sb);
+        file_update_time(vma->vm_file);
+        sb_end_pagefault(sb);
+        return VM_FAULT_NOPAGE;
+}
+EXPORT_SYMBOL_GPL(dax_pfn_mkwrite);
+
+/**
  * dax_zero_page_range - zero a range within a page of a DAX file
  * @inode: The file being truncated
  * @from: The file offset that is being truncated to
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 678f9ab08c48..8d15febd0aa3 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -793,7 +793,6 @@ extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
                       int datasync);
 extern const struct inode_operations ext2_file_inode_operations;
 extern const struct file_operations ext2_file_operations;
-extern const struct file_operations ext2_dax_file_operations;
 
 /* inode.c */
 extern const struct address_space_operations ext2_aops;
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ef04fdb57dbf..3a0a6c6406d0 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -39,6 +39,7 @@ static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 static const struct vm_operations_struct ext2_dax_vm_ops = {
         .fault          = ext2_dax_fault,
         .page_mkwrite   = ext2_dax_mkwrite,
+        .pfn_mkwrite    = dax_pfn_mkwrite,
 };
 
 static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
@@ -106,22 +107,6 @@ const struct file_operations ext2_file_operations = {
         .splice_write   = iter_file_splice_write,
 };
 
-#ifdef CONFIG_FS_DAX
-const struct file_operations ext2_dax_file_operations = {
-        .llseek         = generic_file_llseek,
-        .read_iter      = generic_file_read_iter,
-        .write_iter     = generic_file_write_iter,
-        .unlocked_ioctl = ext2_ioctl,
-#ifdef CONFIG_COMPAT
-        .compat_ioctl   = ext2_compat_ioctl,
-#endif
-        .mmap           = ext2_file_mmap,
-        .open           = dquot_file_open,
-        .release        = ext2_release_file,
-        .fsync          = ext2_fsync,
-};
-#endif
-
 const struct inode_operations ext2_file_inode_operations = {
 #ifdef CONFIG_EXT2_FS_XATTR
         .setxattr       = generic_setxattr,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index df9d6afbc5d5..b29eb6747116 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1388,10 +1388,7 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
 
         if (S_ISREG(inode->i_mode)) {
                 inode->i_op = &ext2_file_inode_operations;
-                if (test_opt(inode->i_sb, DAX)) {
-                        inode->i_mapping->a_ops = &ext2_aops;
-                        inode->i_fop = &ext2_dax_file_operations;
-                } else if (test_opt(inode->i_sb, NOBH)) {
+                if (test_opt(inode->i_sb, NOBH)) {
                         inode->i_mapping->a_ops = &ext2_nobh_aops;
                         inode->i_fop = &ext2_file_operations;
                 } else {
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 148f6e3789ea..ce422931f411 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -104,10 +104,7 @@ static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode
                 return PTR_ERR(inode);
 
         inode->i_op = &ext2_file_inode_operations;
-        if (test_opt(inode->i_sb, DAX)) {
-                inode->i_mapping->a_ops = &ext2_aops;
-                inode->i_fop = &ext2_dax_file_operations;
-        } else if (test_opt(inode->i_sb, NOBH)) {
+        if (test_opt(inode->i_sb, NOBH)) {
                 inode->i_mapping->a_ops = &ext2_nobh_aops;
                 inode->i_fop = &ext2_file_operations;
         } else {
@@ -125,10 +122,7 @@ static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
                 return PTR_ERR(inode);
 
         inode->i_op = &ext2_file_inode_operations;
-        if (test_opt(inode->i_sb, DAX)) {
-                inode->i_mapping->a_ops = &ext2_aops;
-                inode->i_fop = &ext2_dax_file_operations;
-        } else if (test_opt(inode->i_sb, NOBH)) {
+        if (test_opt(inode->i_sb, NOBH)) {
                 inode->i_mapping->a_ops = &ext2_nobh_aops;
                 inode->i_fop = &ext2_file_operations;
         } else {
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f63c3d5805c4..8a3981ea35d8 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2593,7 +2593,6 @@ extern const struct file_operations ext4_dir_operations;
 /* file.c */
 extern const struct inode_operations ext4_file_inode_operations;
 extern const struct file_operations ext4_file_operations;
-extern const struct file_operations ext4_dax_file_operations;
 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
 
 /* inline.c */
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 9ad03036d9f5..7a6defcf3352 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -206,6 +206,7 @@ static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 static const struct vm_operations_struct ext4_dax_vm_ops = {
         .fault          = ext4_dax_fault,
         .page_mkwrite   = ext4_dax_mkwrite,
+        .pfn_mkwrite    = dax_pfn_mkwrite,
 };
 #else
 #define ext4_dax_vm_ops ext4_file_vm_ops
@@ -622,24 +623,6 @@ const struct file_operations ext4_file_operations = {
         .fallocate      = ext4_fallocate,
 };
 
-#ifdef CONFIG_FS_DAX
-const struct file_operations ext4_dax_file_operations = {
-        .llseek         = ext4_llseek,
-        .read_iter      = generic_file_read_iter,
-        .write_iter     = ext4_file_write_iter,
-        .unlocked_ioctl = ext4_ioctl,
-#ifdef CONFIG_COMPAT
-        .compat_ioctl   = ext4_compat_ioctl,
-#endif
-        .mmap           = ext4_file_mmap,
-        .open           = ext4_file_open,
-        .release        = ext4_release_file,
-        .fsync          = ext4_sync_file,
-        /* Splice not yet supported with DAX */
-        .fallocate      = ext4_fallocate,
-};
-#endif
-
 const struct inode_operations ext4_file_inode_operations = {
         .setattr        = ext4_setattr,
         .getattr        = ext4_getattr,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a3f451370bef..035b7a06f1c3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4090,10 +4090,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 
         if (S_ISREG(inode->i_mode)) {
                 inode->i_op = &ext4_file_inode_operations;
-                if (test_opt(inode->i_sb, DAX))
-                        inode->i_fop = &ext4_dax_file_operations;
-                else
-                        inode->i_fop = &ext4_file_operations;
+                inode->i_fop = &ext4_file_operations;
                 ext4_set_aops(inode);
         } else if (S_ISDIR(inode->i_mode)) {
                 inode->i_op = &ext4_dir_inode_operations;
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 28fe71a2904c..2291923dae4e 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2235,10 +2235,7 @@ retry:
         err = PTR_ERR(inode);
         if (!IS_ERR(inode)) {
                 inode->i_op = &ext4_file_inode_operations;
-                if (test_opt(inode->i_sb, DAX))
-                        inode->i_fop = &ext4_dax_file_operations;
-                else
-                        inode->i_fop = &ext4_file_operations;
+                inode->i_fop = &ext4_file_operations;
                 ext4_set_aops(inode);
                 err = ext4_add_nondir(handle, dentry, inode);
                 if (!err && IS_DIRSYNC(dir))
@@ -2302,10 +2299,7 @@ retry:
         err = PTR_ERR(inode);
         if (!IS_ERR(inode)) {
                 inode->i_op = &ext4_file_inode_operations;
-                if (test_opt(inode->i_sb, DAX))
-                        inode->i_fop = &ext4_dax_file_operations;
-                else
-                        inode->i_fop = &ext4_file_operations;
+                inode->i_fop = &ext4_file_operations;
                 ext4_set_aops(inode);
                 d_tmpfile(dentry, inode);
                 err = ext4_orphan_add(handle, inode);
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 45e34908bdb5..2640d88b0e63 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -48,9 +48,10 @@ struct hugetlbfs_config {
         kuid_t   uid;
         kgid_t   gid;
         umode_t mode;
-        long    nr_blocks;
+        long    max_hpages;
         long    nr_inodes;
         struct hstate *hstate;
+        long    min_hpages;
 };
 
 struct hugetlbfs_inode_info {
@@ -68,7 +69,7 @@ int sysctl_hugetlb_shm_group;
 enum {
         Opt_size, Opt_nr_inodes,
         Opt_mode, Opt_uid, Opt_gid,
-        Opt_pagesize,
+        Opt_pagesize, Opt_min_size,
         Opt_err,
 };
 
@@ -79,6 +80,7 @@ static const match_table_t tokens = {
         {Opt_uid,       "uid=%u"},
         {Opt_gid,       "gid=%u"},
         {Opt_pagesize,  "pagesize=%s"},
+        {Opt_min_size,  "min_size=%s"},
         {Opt_err,       NULL},
 };
 
@@ -729,14 +731,38 @@ static const struct super_operations hugetlbfs_ops = {
         .show_options   = generic_show_options,
 };
 
+enum { NO_SIZE, SIZE_STD, SIZE_PERCENT };
+
+/*
+ * Convert size option passed from command line to number of huge pages
+ * in the pool specified by hstate.  Size option could be in bytes
+ * (val_type == SIZE_STD) or percentage of the pool (val_type == SIZE_PERCENT).
+ */
+static long long
+hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt,
+                                                                int val_type)
+{
+        if (val_type == NO_SIZE)
+                return -1;
+
+        if (val_type == SIZE_PERCENT) {
+                size_opt <<= huge_page_shift(h);
+                size_opt *= h->max_huge_pages;
+                do_div(size_opt, 100);
+        }
+
+        size_opt >>= huge_page_shift(h);
+        return size_opt;
+}
+
 static int
 hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
 {
         char *p, *rest;
         substring_t args[MAX_OPT_ARGS];
         int option;
-        unsigned long long size = 0;
-        enum { NO_SIZE, SIZE_STD, SIZE_PERCENT } setsize = NO_SIZE;
+        unsigned long long max_size_opt = 0, min_size_opt = 0;
+        int max_val_type = NO_SIZE, min_val_type = NO_SIZE;
 
         if (!options)
                 return 0;
@@ -774,10 +800,10 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
                         /* memparse() will accept a K/M/G without a digit */
                         if (!isdigit(*args[0].from))
                                 goto bad_val;
-                        size = memparse(args[0].from, &rest);
-                        setsize = SIZE_STD;
+                        max_size_opt = memparse(args[0].from, &rest);
+                        max_val_type = SIZE_STD;
                         if (*rest == '%')
-                                setsize = SIZE_PERCENT;
+                                max_val_type = SIZE_PERCENT;
                         break;
                 }
 
@@ -800,6 +826,17 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
                         break;
                 }
 
+                case Opt_min_size: {
+                        /* memparse() will accept a K/M/G without a digit */
+                        if (!isdigit(*args[0].from))
+                                goto bad_val;
+                        min_size_opt = memparse(args[0].from, &rest);
+                        min_val_type = SIZE_STD;
+                        if (*rest == '%')
+                                min_val_type = SIZE_PERCENT;
+                        break;
+                }
+
                 default:
                         pr_err("Bad mount option: \"%s\"\n", p);
                         return -EINVAL;
@@ -807,15 +844,22 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
                 }
         }
 
-        /* Do size after hstate is set up */
-        if (setsize > NO_SIZE) {
-                struct hstate *h = pconfig->hstate;
-                if (setsize == SIZE_PERCENT) {
-                        size <<= huge_page_shift(h);
-                        size *= h->max_huge_pages;
-                        do_div(size, 100);
-                }
-                pconfig->nr_blocks = (size >> huge_page_shift(h));
+        /*
+         * Use huge page pool size (in hstate) to convert the size
+         * options to number of huge pages.  If NO_SIZE, -1 is returned.
+         */
+        pconfig->max_hpages = hugetlbfs_size_to_hpages(pconfig->hstate,
+                                                max_size_opt, max_val_type);
+        pconfig->min_hpages = hugetlbfs_size_to_hpages(pconfig->hstate,
+                                                min_size_opt, min_val_type);
+
+        /*
+         * If max_size was specified, then min_size must be smaller
+         */
+        if (max_val_type > NO_SIZE &&
+            pconfig->min_hpages > pconfig->max_hpages) {
+                pr_err("minimum size can not be greater than maximum size\n");
+                return -EINVAL;
         }
 
         return 0;
@@ -834,12 +878,13 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
 
         save_mount_options(sb, data);
 
-        config.nr_blocks = -1; /* No limit on size by default */
+        config.max_hpages = -1; /* No limit on size by default */
         config.nr_inodes = -1; /* No limit on number of inodes by default */
         config.uid = current_fsuid();
         config.gid = current_fsgid();
         config.mode = 0755;
         config.hstate = &default_hstate;
+        config.min_hpages = -1; /* No default minimum size */
         ret = hugetlbfs_parse_options(data, &config);
         if (ret)
                 return ret;
@@ -853,8 +898,15 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
         sbinfo->max_inodes = config.nr_inodes;
         sbinfo->free_inodes = config.nr_inodes;
         sbinfo->spool = NULL;
-        if (config.nr_blocks != -1) {
-                sbinfo->spool = hugepage_new_subpool(config.nr_blocks);
+        /*
+         * Allocate and initialize subpool if maximum or minimum size is
+         * specified.  Any needed reservations (for minimim size) are taken
+         * taken when the subpool is created.
+         */
+        if (config.max_hpages != -1 || config.min_hpages != -1) {
+                sbinfo->spool = hugepage_new_subpool(config.hstate,
+                                                        config.max_hpages,
+                                                        config.min_hpages);
                 if (!sbinfo->spool)
                         goto out_free;
         }
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 49ba7ff1bbb9..16a0922beb59 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -183,30 +183,23 @@ static inline void remove_metapage(struct page *page, struct metapage *mp)
 
 #endif
 
-static void init_once(void *foo)
-{
-        struct metapage *mp = (struct metapage *)foo;
-
-        mp->lid = 0;
-        mp->lsn = 0;
-        mp->flag = 0;
-        mp->data = NULL;
-        mp->clsn = 0;
-        mp->log = NULL;
-        set_bit(META_free, &mp->flag);
-        init_waitqueue_head(&mp->wait);
-}
-
 static inline struct metapage *alloc_metapage(gfp_t gfp_mask)
 {
-        return mempool_alloc(metapage_mempool, gfp_mask);
+        struct metapage *mp = mempool_alloc(metapage_mempool, gfp_mask);
+
+        if (mp) {
+                mp->lid = 0;
+                mp->lsn = 0;
+                mp->data = NULL;
+                mp->clsn = 0;
+                mp->log = NULL;
+                init_waitqueue_head(&mp->wait);
+        }
+        return mp;
 }
 
 static inline void free_metapage(struct metapage *mp)
 {
-        mp->flag = 0;
-        set_bit(META_free, &mp->flag);
-
         mempool_free(mp, metapage_mempool);
 }
 
@@ -216,7 +209,7 @@ int __init metapage_init(void)
          * Allocate the metapage structures
          */
         metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage),
-                                           0, 0, init_once);
+                                           0, 0, NULL);
         if (metapage_cache == NULL)
                 return -ENOMEM;
 
diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h
index a78beda85f68..337e9e51ac06 100644
--- a/fs/jfs/jfs_metapage.h
+++ b/fs/jfs/jfs_metapage.h
@@ -48,7 +48,6 @@ struct metapage {
 
 /* metapage flag */
 #define META_locked     0
-#define META_free       1
 #define META_dirty      2
 #define META_sync       3
 #define META_discard    4
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index c7abc10279af..f31fd0dd92c6 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -1,6 +1,6 @@
 config NFS_FS
         tristate "NFS client support"
-        depends on INET && FILE_LOCKING
+        depends on INET && FILE_LOCKING && MULTIUSER
         select LOCKD
         select SUNRPC
         select NFS_ACL_SUPPORT if NFS_V3_ACL
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index 683bf718aead..fc2d108f5272 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -6,6 +6,7 @@ config NFSD
         select SUNRPC
         select EXPORTFS
         select NFS_ACL_SUPPORT if NFSD_V2_ACL
+        depends on MULTIUSER
         help
           Choose Y here if you want to allow other computers to access
           files residing on this system using Sun's Network File System
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 1295a00ca316..fd02a9ebfc30 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -99,8 +99,8 @@ static inline void task_name(struct seq_file *m, struct task_struct *p)
         buf = m->buf + m->count;
 
         /* Ignore error for now */
-        string_escape_str(tcomm, &buf, m->size - m->count,
-                          ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
+        buf += string_escape_str(tcomm, buf, m->size - m->count,
+                                 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
 
         m->count = buf - m->buf;
         seq_putc(m, '\n');
@@ -188,6 +188,24 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
                            from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
         put_cred(cred);
 
+#ifdef CONFIG_PID_NS
+        seq_puts(m, "\nNStgid:");
+        for (g = ns->level; g <= pid->level; g++)
+                seq_printf(m, "\t%d",
+                        task_tgid_nr_ns(p, pid->numbers[g].ns));
+        seq_puts(m, "\nNSpid:");
+        for (g = ns->level; g <= pid->level; g++)
+                seq_printf(m, "\t%d",
+                        task_pid_nr_ns(p, pid->numbers[g].ns));
+        seq_puts(m, "\nNSpgid:");
+        for (g = ns->level; g <= pid->level; g++)
+                seq_printf(m, "\t%d",
+                        task_pgrp_nr_ns(p, pid->numbers[g].ns));
+        seq_puts(m, "\nNSsid:");
+        for (g = ns->level; g <= pid->level; g++)
+                seq_printf(m, "\t%d",
+                        task_session_nr_ns(p, pid->numbers[g].ns));
+#endif
         seq_putc(m, '\n');
 }
 
@@ -614,7 +632,9 @@ static int children_seq_show(struct seq_file *seq, void *v)
         pid_t pid;
 
         pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
-        return seq_printf(seq, "%d ", pid);
+        seq_printf(seq, "%d ", pid);
+
+        return 0;
 }
 
 static void *children_seq_start(struct seq_file *seq, loff_t *pos)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3f3d7aeb0712..7a3b82f986dd 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -238,13 +238,15 @@ static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
 
         wchan = get_wchan(task);
 
-        if (lookup_symbol_name(wchan, symname) < 0)
+        if (lookup_symbol_name(wchan, symname) < 0) {
                 if (!ptrace_may_access(task, PTRACE_MODE_READ))
                         return 0;
-                else
-                        return seq_printf(m, "%lu", wchan);
-        else
-                return seq_printf(m, "%s", symname);
+                seq_printf(m, "%lu", wchan);
+        } else {
+                seq_printf(m, "%s", symname);
+        }
+
+        return 0;
 }
 #endif /* CONFIG_KALLSYMS */
 
@@ -309,10 +311,12 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
 static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,
                               struct pid *pid, struct task_struct *task)
 {
-        return seq_printf(m, "%llu %llu %lu\n",
-                        (unsigned long long)task->se.sum_exec_runtime,
-                        (unsigned long long)task->sched_info.run_delay,
-                        task->sched_info.pcount);
+        seq_printf(m, "%llu %llu %lu\n",
+                   (unsigned long long)task->se.sum_exec_runtime,
+                   (unsigned long long)task->sched_info.run_delay,
+                   task->sched_info.pcount);
+
+        return 0;
 }
 #endif
 
@@ -387,7 +391,9 @@ static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
                 points = oom_badness(task, NULL, NULL, totalpages) *
                                                 1000 / totalpages;
         read_unlock(&tasklist_lock);
-        return seq_printf(m, "%lu\n", points);
+        seq_printf(m, "%lu\n", points);
+
+        return 0;
 }
 
 struct limit_names {
@@ -432,15 +438,15 @@ static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
          * print the file header
          */
        seq_printf(m, "%-25s %-20s %-20s %-10s\n",
-                        "Limit", "Soft Limit", "Hard Limit", "Units");
+                  "Limit", "Soft Limit", "Hard Limit", "Units");
 
         for (i = 0; i < RLIM_NLIMITS; i++) {
                 if (rlim[i].rlim_cur == RLIM_INFINITY)
                         seq_printf(m, "%-25s %-20s ",
-                                         lnames[i].name, "unlimited");
+                                   lnames[i].name, "unlimited");
                 else
                         seq_printf(m, "%-25s %-20lu ",
-                                         lnames[i].name, rlim[i].rlim_cur);
+                                   lnames[i].name, rlim[i].rlim_cur);
 
                 if (rlim[i].rlim_max == RLIM_INFINITY)
                         seq_printf(m, "%-20s ", "unlimited");
@@ -462,7 +468,9 @@ static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
 {
         long nr;
         unsigned long args[6], sp, pc;
-        int res = lock_trace(task);
+        int res;
+
+        res = lock_trace(task);
         if (res)
                 return res;
 
@@ -477,7 +485,8 @@ static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
                        args[0], args[1], args[2], args[3], args[4], args[5],
                        sp, pc);
         unlock_trace(task);
-        return res;
+
+        return 0;
 }
 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
 
@@ -2002,12 +2011,13 @@ static int show_timer(struct seq_file *m, void *v)
         notify = timer->it_sigev_notify;
 
         seq_printf(m, "ID: %d\n", timer->it_id);
-        seq_printf(m, "signal: %d/%p\n", timer->sigq->info.si_signo,
-                        timer->sigq->info.si_value.sival_ptr);
+        seq_printf(m, "signal: %d/%p\n",
+                   timer->sigq->info.si_signo,
+                   timer->sigq->info.si_value.sival_ptr);
         seq_printf(m, "notify: %s/%s.%d\n",
-                nstr[notify & ~SIGEV_THREAD_ID],
-                (notify & SIGEV_THREAD_ID) ? "tid" : "pid",
-                pid_nr_ns(timer->it_pid, tp->ns));
+                   nstr[notify & ~SIGEV_THREAD_ID],
+                   (notify & SIGEV_THREAD_ID) ? "tid" : "pid",
+                   pid_nr_ns(timer->it_pid, tp->ns));
         seq_printf(m, "ClockID: %d\n", timer->it_clock);
 
         return 0;
@@ -2352,21 +2362,23 @@ static int do_io_accounting(struct task_struct *task, struct seq_file *m, int wh
 
                 unlock_task_sighand(task, &flags);
         }
-        result = seq_printf(m,
-                        "rchar: %llu\n"
-                        "wchar: %llu\n"
-                        "syscr: %llu\n"
-                        "syscw: %llu\n"
-                        "read_bytes: %llu\n"
-                        "write_bytes: %llu\n"
-                        "cancelled_write_bytes: %llu\n",
-                        (unsigned long long)acct.rchar,
-                        (unsigned long long)acct.wchar,
-                        (unsigned long long)acct.syscr,
-                        (unsigned long long)acct.syscw,
-                        (unsigned long long)acct.read_bytes,
-                        (unsigned long long)acct.write_bytes,
-                        (unsigned long long)acct.cancelled_write_bytes);
+        seq_printf(m,
+                   "rchar: %llu\n"
+                   "wchar: %llu\n"
+                   "syscr: %llu\n"
+                   "syscw: %llu\n"
+                   "read_bytes: %llu\n"
+                   "write_bytes: %llu\n"
+                   "cancelled_write_bytes: %llu\n",
+                   (unsigned long long)acct.rchar,
+                   (unsigned long long)acct.wchar,
+                   (unsigned long long)acct.syscr,
+                   (unsigned long long)acct.syscw,
+                   (unsigned long long)acct.read_bytes,
+                   (unsigned long long)acct.write_bytes,
+                   (unsigned long long)acct.cancelled_write_bytes);
+        result = 0;
+
 out_unlock:
         mutex_unlock(&task->signal->cred_guard_mutex);
         return result;
diff --git a/fs/splice.c b/fs/splice.c
index 41cbb16299e0..476024bb6546 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -523,6 +523,9 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
         loff_t isize, left;
         int ret;
 
+        if (IS_DAX(in->f_mapping->host))
+                return default_file_splice_read(in, ppos, pipe, len, flags);
+
         isize = i_size_read(in->f_mapping->host);
         if (unlikely(*ppos >= isize))
                 return 0;