Merge branch 'akpm' (incoming fixes from Andrew)

Merge misc fixes from Andrew Morton:
 "The audit fixes have been floating around for a while - Al and Eric
  aren't responding to either myself or Kees so I asked Kees to
  re-review them and here they are."

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (22 commits)
  lib/rbtree.c: avoid the use of non-static __always_inline
  MAINTAINERS: Omar had moved
  mm: compaction: partially revert capture of suitable high-order page
  linux/audit.h: move ptrace.h include to kernel header
  kernel/audit.c: avoid negative sleep durations
  audit: catch possible NULL audit buffers
  audit: create explicit AUDIT_SECCOMP event type
  MAINTAINERS: fix a status pattern
  MAINTAINERS: fix arch/arm/plat-omap/include/plat/omap_hwmod.h
  mm: thp: acquire the anon_vma rwsem for write during split
  mm: mmap: annotate vm_lock_anon_vma locking properly for lockdep
  lockdep, rwsem: provide down_write_nest_lock()
  arch/mn10300/Kconfig: select CONFIG_GENERIC_ATOMIC64
  mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment
  mm: use aligned zone start for pfn_to_bitidx calculation
  fs/exec.c: work around icc miscompilation
  mm: compaction: fix echo 1 > compact_memory return error issue
  mm: memblock: fix wrong memmove size in memblock_merge_regions()
  drivers/video/ssd1307fb.c: fix bit order bug in the byte translation function
  mm: migrate: check page_count of THP before migrating
  ...

5 files changed, 71 insertions, 27 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index 40414e9143db..d596e5355f15 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -272,6 +272,8 @@ static int audit_log_config_change(char *function_name, int new, int old,
         int rc = 0;
 
         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+        if (unlikely(!ab))
+                return rc;
         audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
                          old, from_kuid(&init_user_ns, loginuid), sessionid);
         if (sid) {
@@ -619,6 +621,8 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
         }
 
         *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
+        if (unlikely(!*ab))
+                return rc;
         audit_log_format(*ab, "pid=%d uid=%u auid=%u ses=%u",
                          task_tgid_vnr(current),
                          from_kuid(&init_user_ns, current_uid()),
@@ -1097,6 +1101,23 @@ static inline void audit_get_stamp(struct audit_context *ctx,
         }
 }
 
+/*
+ * Wait for auditd to drain the queue a little
+ */
+static void wait_for_auditd(unsigned long sleep_time)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&audit_backlog_wait, &wait);
+
+        if (audit_backlog_limit &&
+            skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
+                schedule_timeout(sleep_time);
+
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&audit_backlog_wait, &wait);
+}
+
 /* Obtain an audit buffer.  This routine does locking to obtain the
  * audit buffer, but then no locking is required for calls to
  * audit_log_*format.  If the tsk is a task that is currently in a
@@ -1142,20 +1163,13 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 
         while (audit_backlog_limit
                && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
-                if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
-                    && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
+                if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
+                        unsigned long sleep_time;
 
-                        /* Wait for auditd to drain the queue a little */
-                        DECLARE_WAITQUEUE(wait, current);
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        add_wait_queue(&audit_backlog_wait, &wait);
-
-                        if (audit_backlog_limit &&
-                            skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
-                                schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
-
-                        __set_current_state(TASK_RUNNING);
-                        remove_wait_queue(&audit_backlog_wait, &wait);
+                        sleep_time = timeout_start + audit_backlog_wait_time -
+                                        jiffies;
+                        if ((long)sleep_time > 0)
+                                wait_for_auditd(sleep_time);
                         continue;
                 }
                 if (audit_rate_check() && printk_ratelimit())
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index e81175ef25f8..642a89c4f3d6 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -449,11 +449,26 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
         return 0;
 }
 
+static void audit_log_remove_rule(struct audit_krule *rule)
+{
+        struct audit_buffer *ab;
+
+        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+        if (unlikely(!ab))
+                return;
+        audit_log_format(ab, "op=");
+        audit_log_string(ab, "remove rule");
+        audit_log_format(ab, " dir=");
+        audit_log_untrustedstring(ab, rule->tree->pathname);
+        audit_log_key(ab, rule->filterkey);
+        audit_log_format(ab, " list=%d res=1", rule->listnr);
+        audit_log_end(ab);
+}
+
 static void kill_rules(struct audit_tree *tree)
 {
         struct audit_krule *rule, *next;
         struct audit_entry *entry;
-        struct audit_buffer *ab;
 
         list_for_each_entry_safe(rule, next, &tree->rules, rlist) {
                 entry = container_of(rule, struct audit_entry, rule);
@@ -461,14 +476,7 @@ static void kill_rules(struct audit_tree *tree)
                 list_del_init(&rule->rlist);
                 if (rule->tree) {
                         /* not a half-baked one */
-                        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
-                        audit_log_format(ab, "op=");
-                        audit_log_string(ab, "remove rule");
-                        audit_log_format(ab, " dir=");
-                        audit_log_untrustedstring(ab, rule->tree->pathname);
-                        audit_log_key(ab, rule->filterkey);
-                        audit_log_format(ab, " list=%d res=1", rule->listnr);
-                        audit_log_end(ab);
+                        audit_log_remove_rule(rule);
                         rule->tree = NULL;
                         list_del_rcu(&entry->list);
                         list_del(&entry->rule.list);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 4a599f699adc..22831c4d369c 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -240,6 +240,8 @@ static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watc
         if (audit_enabled) {
                 struct audit_buffer *ab;
                 ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
+                if (unlikely(!ab))
+                        return;
                 audit_log_format(ab, "auid=%u ses=%u op=",
                                  from_kuid(&init_user_ns, audit_get_loginuid(current)),
                                  audit_get_sessionid(current));
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index e37e6a12c5e3..a371f857a0a9 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1464,14 +1464,14 @@ static void show_special(struct audit_context *context, int *call_panic)
                         audit_log_end(ab);
                         ab = audit_log_start(context, GFP_KERNEL,
                                              AUDIT_IPC_SET_PERM);
+                        if (unlikely(!ab))
+                                return;
                         audit_log_format(ab,
                                 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
                                 context->ipc.qbytes,
                                 context->ipc.perm_uid,
                                 context->ipc.perm_gid,
                                 context->ipc.perm_mode);
-                        if (!ab)
-                                return;
                 }
                 break; }
         case AUDIT_MQ_OPEN: {
@@ -2675,7 +2675,7 @@ void __audit_mmap_fd(int fd, int flags)
         context->type = AUDIT_MMAP;
 }
 
-static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
+static void audit_log_task(struct audit_buffer *ab)
 {
         kuid_t auid, uid;
         kgid_t gid;
@@ -2693,6 +2693,11 @@ static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
         audit_log_task_context(ab);
         audit_log_format(ab, " pid=%d comm=", current->pid);
         audit_log_untrustedstring(ab, current->comm);
+}
+
+static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
+{
+        audit_log_task(ab);
         audit_log_format(ab, " reason=");
         audit_log_string(ab, reason);
         audit_log_format(ab, " sig=%ld", signr);
@@ -2715,6 +2720,8 @@ void audit_core_dumps(long signr)
                 return;
 
         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+        if (unlikely(!ab))
+                return;
         audit_log_abend(ab, "memory violation", signr);
         audit_log_end(ab);
 }
@@ -2723,8 +2730,11 @@ void __audit_seccomp(unsigned long syscall, long signr, int code)
 {
         struct audit_buffer *ab;
 
-        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
-        audit_log_abend(ab, "seccomp", signr);
+        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
+        if (unlikely(!ab))
+                return;
+        audit_log_task(ab);
+        audit_log_format(ab, " sig=%ld", signr);
         audit_log_format(ab, " syscall=%ld", syscall);
         audit_log_format(ab, " compat=%d", is_compat_task());
         audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current));
diff --git a/kernel/rwsem.c b/kernel/rwsem.c
index 6850f53e02d8..b3c6c3fcd847 100644
--- a/kernel/rwsem.c
+++ b/kernel/rwsem.c
@@ -116,6 +116,16 @@ void down_read_nested(struct rw_semaphore *sem, int subclass)
 
 EXPORT_SYMBOL(down_read_nested);
 
+void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest)
+{
+        might_sleep();
+        rwsem_acquire_nest(&sem->dep_map, 0, 0, nest, _RET_IP_);
+
+        LOCK_CONTENDED(sem, __down_write_trylock, __down_write);
+}
+
+EXPORT_SYMBOL(_down_write_nest_lock);
+
 void down_write_nested(struct rw_semaphore *sem, int subclass)
 {
         might_sleep();