Merge branch 'akpm' (Andrew's patch-bomb)

Merge patches through Andrew Morton:
 "180 patches - err 181 - listed below:

   - most of MM.  I held back the (large) "memcg: add hugetlb extension"
     series because a bunfight has recently broken out.

   - leds.  After this, Bryan Wu will be handling drivers/leds/

   - backlight

   - lib/

   - rtc"

* emailed from Andrew Morton <akpm@linux-foundation.org>: (181 patches)
  drivers/rtc/rtc-s3c.c: fix compiler warning
  drivers/rtc/rtc-tegra.c: clean up probe/remove routines
  drivers/rtc/rtc-pl031.c: remove RTC timer interrupt handling
  drivers/rtc/rtc-lpc32xx.c: add device tree support
  drivers/rtc/rtc-m41t93.c: don't let get_time() reset M41T93_FLAG_OF
  rtc: ds1307: add trickle charger support
  rtc: ds1307: remove superfluous initialization
  rtc: rename CONFIG_RTC_MXC to CONFIG_RTC_DRV_MXC
  drivers/rtc/Kconfig: place RTC_DRV_IMXDI and RTC_MXC under "on-CPU RTC drivers"
  drivers/rtc/rtc-pcf8563.c: add RTC_VL_READ/RTC_VL_CLR ioctl feature
  rtc: add ioctl to get/clear battery low voltage status
  drivers/rtc/rtc-ep93xx.c: convert to use module_platform_driver()
  rtc/spear: add Device Tree probing capability
  lib/vsprintf.c: "%#o",0 becomes '0' instead of '00'
  radix-tree: fix preload vector size
  spinlock_debug: print kallsyms name for lock
  vsprintf: fix %ps on non symbols when using kallsyms
  lib/bitmap.c: fix documentation for scnprintf() functions
  lib/string_helpers.c: make arrays static
  lib/test-kstrtox.c: mark const init data with __initconst instead of __initdata
  ...

4 files changed, 44 insertions, 30 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a0c6af34d500..0f3527d6184a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5132,7 +5132,7 @@ EXPORT_SYMBOL_GPL(css_depth);
  * @root: the css supporsed to be an ancestor of the child.
  *
  * Returns true if "root" is an ancestor of "child" in its hierarchy. Because
- * this function reads css->id, this use rcu_dereference() and rcu_read_lock().
+ * this function reads css->id, the caller must hold rcu_read_lock().
  * But, considering usual usage, the csses should be valid objects after test.
  * Assuming that the caller will do some action to the child if this returns
  * returns true, the caller must take "child";s reference count.
@@ -5144,18 +5144,18 @@ bool css_is_ancestor(struct cgroup_subsys_state *child,
 {
 	struct css_id *child_id;
 	struct css_id *root_id;
-	bool ret = true;
 
-	rcu_read_lock();
 	child_id  = rcu_dereference(child->id);
+	if (!child_id)
+		return false;
 	root_id = rcu_dereference(root->id);
-	if (!child_id
-	    || !root_id
-	    || (child_id->depth < root_id->depth)
-	    || (child_id->stack[root_id->depth] != root_id->id))
-		ret = false;
-	rcu_read_unlock();
-	return ret;
+	if (!root_id)
+		return false;
+	if (child_id->depth < root_id->depth)
+		return false;
+	if (child_id->stack[root_id->depth] != root_id->id)
+		return false;
+	return true;
 }
 
 void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
diff --git a/kernel/fork.c b/kernel/fork.c
index 47b4e4f379f9..017fb23d5983 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -386,7 +386,8 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 		}
 		charge = 0;
 		if (mpnt->vm_flags & VM_ACCOUNT) {
-			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
+			unsigned long len;
+			len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
 			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
 				goto fail_nomem;
 			charge = len;
@@ -614,7 +615,6 @@ void mmput(struct mm_struct *mm)
 			list_del(&mm->mmlist);
 			spin_unlock(&mmlist_lock);
 		}
-		put_swap_token(mm);
 		if (mm->binfmt)
 			module_put(mm->binfmt->module);
 		mmdrop(mm);
@@ -831,10 +831,6 @@ struct mm_struct *dup_mm(struct task_struct *tsk)
 	memcpy(mm, oldmm, sizeof(*mm));
 	mm_init_cpumask(mm);
 
-	/* Initializing for Swap token stuff */
-	mm->token_priority = 0;
-	mm->last_interval = 0;
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	mm->pmd_huge_pte = NULL;
 #endif
@@ -913,10 +909,6 @@ static int copy_mm(unsigned long clone_flags, struct task_struct *tsk)
 		goto fail_nomem;
 
 good_mm:
-	/* Initializing for Swap token stuff */
-	mm->token_priority = 0;
-	mm->last_interval = 0;
-
 	tsk->mm = mm;
 	tsk->active_mm = mm;
 	return 0;
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 079f1d39a8b8..2169feeba529 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -343,7 +343,7 @@ int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
 
 /* Look up a kernel symbol and return it in a text buffer. */
 static int __sprint_symbol(char *buffer, unsigned long address,
-			   int symbol_offset)
+			   int symbol_offset, int add_offset)
 {
 	char *modname;
 	const char *name;
@@ -358,13 +358,13 @@ static int __sprint_symbol(char *buffer, unsigned long address,
 	if (name != buffer)
 		strcpy(buffer, name);
 	len = strlen(buffer);
-	buffer += len;
 	offset -= symbol_offset;
 
+	if (add_offset)
+		len += sprintf(buffer + len, "+%#lx/%#lx", offset, size);
+
 	if (modname)
-		len += sprintf(buffer, "+%#lx/%#lx [%s]", offset, size, modname);
-	else
-		len += sprintf(buffer, "+%#lx/%#lx", offset, size);
+		len += sprintf(buffer + len, " [%s]", modname);
 
 	return len;
 }
@@ -382,12 +382,28 @@ static int __sprint_symbol(char *buffer, unsigned long address,
  */
 int sprint_symbol(char *buffer, unsigned long address)
 {
-	return __sprint_symbol(buffer, address, 0);
+	return __sprint_symbol(buffer, address, 0, 1);
 }
-
 EXPORT_SYMBOL_GPL(sprint_symbol);
 
 /**
+ * sprint_symbol_no_offset - Look up a kernel symbol and return it in a text buffer
+ * @buffer: buffer to be stored
+ * @address: address to lookup
+ *
+ * This function looks up a kernel symbol with @address and stores its name
+ * and module name to @buffer if possible. If no symbol was found, just saves
+ * its @address as is.
+ *
+ * This function returns the number of bytes stored in @buffer.
+ */
+int sprint_symbol_no_offset(char *buffer, unsigned long address)
+{
+	return __sprint_symbol(buffer, address, 0, 0);
+}
+EXPORT_SYMBOL_GPL(sprint_symbol_no_offset);
+
+/**
  * sprint_backtrace - Look up a backtrace symbol and return it in a text buffer
  * @buffer: buffer to be stored
  * @address: address to lookup
@@ -403,7 +419,7 @@ EXPORT_SYMBOL_GPL(sprint_symbol);
  */
 int sprint_backtrace(char *buffer, unsigned long address)
 {
-	return __sprint_symbol(buffer, address, -1);
+	return __sprint_symbol(buffer, address, -1, 1);
 }
 
 /* Look up a kernel symbol and print it to the kernel messages. */
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index bebe2b170d49..ad581aa2369a 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -94,13 +94,15 @@ void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
 	counter->usage -= val;
 }
 
-void res_counter_uncharge(struct res_counter *counter, unsigned long val)
+void res_counter_uncharge_until(struct res_counter *counter,
+				struct res_counter *top,
+				unsigned long val)
 {
 	unsigned long flags;
 	struct res_counter *c;
 
 	local_irq_save(flags);
-	for (c = counter; c != NULL; c = c->parent) {
+	for (c = counter; c != top; c = c->parent) {
 		spin_lock(&c->lock);
 		res_counter_uncharge_locked(c, val);
 		spin_unlock(&c->lock);
@@ -108,6 +110,10 @@ void res_counter_uncharge(struct res_counter *counter, unsigned long val)
 	local_irq_restore(flags);
 }
 
+void res_counter_uncharge(struct res_counter *counter, unsigned long val)
+{
+	res_counter_uncharge_until(counter, NULL, val);
+}
 
 static inline unsigned long long *
 res_counter_member(struct res_counter *counter, int member)