Merge branch 'akpm' (incoming from Andrew)

Merge second patch-bomb from Andrew Morton:
 - various misc bits
 - the rest of MM
 - add generic fixmap.h, use it
 - backlight updates
 - dynamic_debug updates
 - printk() updates
 - checkpatch updates
 - binfmt_elf
 - ramfs
 - init/
 - autofs4
 - drivers/rtc
 - nilfs
 - hfsplus
 - Documentation/
 - coredump
 - procfs
 - fork
 - exec
 - kexec
 - kdump
 - partitions
 - rapidio
 - rbtree
 - userns
 - memstick
 - w1
 - decompressors

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (197 commits)
  lib/decompress_unlz4.c: always set an error return code on failures
  romfs: fix returm err while getting inode in fill_super
  drivers/w1/masters/w1-gpio.c: add strong pullup emulation
  drivers/memstick/host/rtsx_pci_ms.c: fix ms card data transfer bug
  userns: relax the posix_acl_valid() checks
  arch/sh/kernel/dwarf.c: use rbtree postorder iteration helper instead of solution using repeated rb_erase()
  fs-ext3-use-rbtree-postorder-iteration-helper-instead-of-opencoding-fix
  fs/ext3: use rbtree postorder iteration helper instead of opencoding
  fs/jffs2: use rbtree postorder iteration helper instead of opencoding
  fs/ext4: use rbtree postorder iteration helper instead of opencoding
  fs/ubifs: use rbtree postorder iteration helper instead of opencoding
  net/netfilter/ipset/ip_set_hash_netiface.c: use rbtree postorder iteration instead of opencoding
  rbtree/test: test rbtree_postorder_for_each_entry_safe()
  rbtree/test: move rb_node to the middle of the test struct
  rapidio: add modular rapidio core build into powerpc and mips branches
  partitions/efi: complete documentation of gpt kernel param purpose
  kdump: add /sys/kernel/vmcoreinfo ABI documentation
  kdump: fix exported size of vmcoreinfo note
  kexec: add sysctl to disable kexec_load
  fs/exec.c: call arch_pick_mmap_layout() only once
  ...

8 files changed, 63 insertions, 22 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 2f11bbe376b0..a17621c6cd42 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -800,14 +800,11 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
  * Allocate a new mm structure and copy contents from the
  * mm structure of the passed in task structure.
  */
-struct mm_struct *dup_mm(struct task_struct *tsk)
+static struct mm_struct *dup_mm(struct task_struct *tsk)
 {
         struct mm_struct *mm, *oldmm = current->mm;
         int err;
 
-        if (!oldmm)
-                return NULL;
-
         mm = allocate_mm();
         if (!mm)
                 goto fail_nomem;
@@ -1229,7 +1226,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         if (!try_module_get(task_thread_info(p)->exec_domain->module))
                 goto bad_fork_cleanup_count;
 
-        p->did_exec = 0;
         delayacct_tsk_init(p);  /* Must remain after dup_task_struct() */
         copy_flags(clone_flags, p);
         INIT_LIST_HEAD(&p->children);
@@ -1654,7 +1650,7 @@ SYSCALL_DEFINE0(fork)
         return do_fork(SIGCHLD, 0, 0, NULL, NULL);
 #else
         /* can not support in nommu mode */
-        return(-EINVAL);
+        return -EINVAL;
 #endif
 }
 #endif
@@ -1662,7 +1658,7 @@ SYSCALL_DEFINE0(fork)
 #ifdef __ARCH_WANT_SYS_VFORK
 SYSCALL_DEFINE0(vfork)
 {
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, 
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
                         0, NULL, NULL);
 }
 #endif
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 9c970167e402..ac738781d356 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -932,6 +932,7 @@ static int kimage_load_segment(struct kimage *image,
  */
 struct kimage *kexec_image;
 struct kimage *kexec_crash_image;
+int kexec_load_disabled;
 
 static DEFINE_MUTEX(kexec_mutex);
 
@@ -942,7 +943,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
         int result;
 
         /* We only trust the superuser with rebooting the system. */
-        if (!capable(CAP_SYS_BOOT))
+        if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
                 return -EPERM;
 
         /*
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 9659d38e008f..d945a949760f 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -126,7 +126,7 @@ static ssize_t vmcoreinfo_show(struct kobject *kobj,
 {
         return sprintf(buf, "%lx %x\n",
                        paddr_vmcoreinfo_note(),
-                       (unsigned int)vmcoreinfo_max_size);
+                       (unsigned int)sizeof(vmcoreinfo_note));
 }
 KERNEL_ATTR_RO(vmcoreinfo);
 
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index f8b41bddc6dc..b1d255f04135 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1595,10 +1595,13 @@ asmlinkage int vprintk_emit(int facility, int level,
                  * either merge it with the current buffer and flush, or if
                  * there was a race with interrupts (prefix == true) then just
                  * flush it out and store this line separately.
+                 * If the preceding printk was from a different task and missed
+                 * a newline, flush and append the newline.
                  */
-                if (cont.len && cont.owner == current) {
-                        if (!(lflags & LOG_PREFIX))
-                                stored = cont_add(facility, level, text, text_len);
+                if (cont.len) {
+                        if (cont.owner == current && !(lflags & LOG_PREFIX))
+                                stored = cont_add(facility, level, text,
+                                                  text_len);
                         cont_flush(LOG_NEWLINE);
                 }
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4d6964e49711..7fea865a810d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1770,7 +1770,29 @@ void set_numabalancing_state(bool enabled)
         numabalancing_enabled = enabled;
 }
 #endif /* CONFIG_SCHED_DEBUG */
-#endif /* CONFIG_NUMA_BALANCING */
+
+#ifdef CONFIG_PROC_SYSCTL
+int sysctl_numa_balancing(struct ctl_table *table, int write,
+                         void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+        struct ctl_table t;
+        int err;
+        int state = numabalancing_enabled;
+
+        if (write && !capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        t = *table;
+        t.data = &state;
+        err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos);
+        if (err < 0)
+                return err;
+        if (write)
+                set_numabalancing_state(state);
+        return err;
+}
+#endif
+#endif
 
 /*
  * fork()/clone()-time setup:
diff --git a/kernel/signal.c b/kernel/signal.c
index 940b30ee9a30..52f881db1ca0 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2047,8 +2047,8 @@ static bool do_signal_stop(int signr)
                 if (task_set_jobctl_pending(current, signr | gstop))
                         sig->group_stop_count++;
 
-                for (t = next_thread(current); t != current;
-                     t = next_thread(t)) {
+                t = current;
+                while_each_thread(current, t) {
                         /*
                          * Setting state to TASK_STOPPED for a group
                          * stop is always done with the siglock held,
@@ -3125,8 +3125,7 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
                         rm_from_queue_full(&mask, &t->signal->shared_pending);
                         do {
                                 rm_from_queue_full(&mask, &t->pending);
-                                t = next_thread(t);
-                        } while (t != current);
+                        } while_each_thread(current, t);
                 }
         }
 
diff --git a/kernel/sys.c b/kernel/sys.c
index c72311324ea7..c0a58be780a4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -895,8 +895,7 @@ SYSCALL_DEFINE1(times, struct tms __user *, tbuf)
  * only important on a multi-user system anyway, to make sure one user
  * can't send a signal to a process owned by another.  -TYT, 12/12/91
  *
- * Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
- * LBT 04.03.94
+ * !PF_FORKNOEXEC check to conform completely to POSIX.
  */
 SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
 {
@@ -932,7 +931,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
                 if (task_session(p) != task_session(group_leader))
                         goto out;
                 err = -EACCES;
-                if (p->did_exec)
+                if (!(p->flags & PF_FORKNOEXEC))
                         goto out;
         } else {
                 err = -ESRCH;
@@ -1572,8 +1571,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                         t = p;
                         do {
                                 accumulate_thread_rusage(t, r);
-                                t = next_thread(t);
-                        } while (t != p);
+                        } while_each_thread(p, t);
                         break;
 
                 default:
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 332cefcdb04b..096db7452cbd 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -62,6 +62,7 @@
 #include <linux/capability.h>
 #include <linux/binfmts.h>
 #include <linux/sched/sysctl.h>
+#include <linux/kexec.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -389,6 +390,15 @@ static struct ctl_table kern_table[] = {
                 .mode           = 0644,
                 .proc_handler   = proc_dointvec,
         },
+        {
+                .procname       = "numa_balancing",
+                .data           = NULL, /* filled in by handler */
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = sysctl_numa_balancing,
+                .extra1         = &zero,
+                .extra2         = &one,
+        },
 #endif /* CONFIG_NUMA_BALANCING */
 #endif /* CONFIG_SCHED_DEBUG */
         {
@@ -605,6 +615,18 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = proc_dointvec,
         },
 #endif
+#ifdef CONFIG_KEXEC
+        {
+                .procname       = "kexec_load_disabled",
+                .data           = &kexec_load_disabled,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                /* only handle a transition from default "0" to "1" */
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &one,
+                .extra2         = &one,
+        },
+#endif
 #ifdef CONFIG_MODULES
         {
                 .procname       = "modprobe",