Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  gcc-4.6: kernel/*: Fix unused but set warnings
  mutex: Fix annotations to include it in kernel-locking docbook
  pid: make setpgid() system call use RCU read-side critical section
  MAINTAINERS: Add RCU's public git tree

7 files changed, 12 insertions, 28 deletions

diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
index 75bd9b3..20059ef 100644
--- a/kernel/debug/kdb/kdb_bp.c
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -274,7 +274,6 @@ static int kdb_bp(int argc, const char **argv)
 	int i, bpno;
 	kdb_bp_t *bp, *bp_check;
 	int diag;
-	int free;
 	char *symname = NULL;
 	long offset = 0ul;
 	int nextarg;
@@ -305,7 +304,6 @@ static int kdb_bp(int argc, const char **argv)
 	/*
 	 * Find an empty bp structure to allocate
 	 */
-	free = KDB_MAXBPT;
 	for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT; bpno++, bp++) {
 		if (bp->bp_free)
 			break;
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index ce66917..1decafb 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1091,11 +1091,10 @@ EXPORT_SYMBOL_GPL(hrtimer_cancel);
  */
 ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
 {
-	struct hrtimer_clock_base *base;
 	unsigned long flags;
 	ktime_t rem;
 
-	base = lock_hrtimer_base(timer, &flags);
+	lock_hrtimer_base(timer, &flags);
 	rem = hrtimer_expires_remaining(timer);
 	unlock_hrtimer_base(timer, &flags);
 
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 4c0b7b3..200407c 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -36,15 +36,6 @@
 # include <asm/mutex.h>
 #endif
 
-/***
- * mutex_init - initialize the mutex
- * @lock: the mutex to be initialized
- * @key: the lock_class_key for the class; used by mutex lock debugging
- *
- * Initialize the mutex to unlocked state.
- *
- * It is not allowed to initialize an already locked mutex.
- */
 void
 __mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
 {
@@ -68,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init);
 static __used noinline void __sched
 __mutex_lock_slowpath(atomic_t *lock_count);
 
-/***
+/**
  * mutex_lock - acquire the mutex
  * @lock: the mutex to be acquired
  *
@@ -105,7 +96,7 @@ EXPORT_SYMBOL(mutex_lock);
 
 static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
 
-/***
+/**
  * mutex_unlock - release the mutex
  * @lock: the mutex to be released
  *
@@ -364,8 +355,8 @@ __mutex_lock_killable_slowpath(atomic_t *lock_count);
 static noinline int __sched
 __mutex_lock_interruptible_slowpath(atomic_t *lock_count);
 
-/***
- * mutex_lock_interruptible - acquire the mutex, interruptable
+/**
+ * mutex_lock_interruptible - acquire the mutex, interruptible
  * @lock: the mutex to be acquired
  *
  * Lock the mutex like mutex_lock(), and return 0 if the mutex has
@@ -456,15 +447,15 @@ static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
 	return prev == 1;
 }
 
-/***
- * mutex_trylock - try acquire the mutex, without waiting
+/**
+ * mutex_trylock - try to acquire the mutex, without waiting
  * @lock: the mutex to be acquired
  *
  * Try to acquire the mutex atomically. Returns 1 if the mutex
  * has been acquired successfully, and 0 on contention.
  *
  * NOTE: this function follows the spin_trylock() convention, so
- * it is negated to the down_trylock() return values! Be careful
+ * it is negated from the down_trylock() return values! Be careful
  * about this when converting semaphore users to mutexes.
  *
  * This function must not be used in interrupt context. The
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index ab661eb..134f7ed 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1313,7 +1313,7 @@ static struct sched_group *
 find_idlest_group(struct sched_domain *sd, struct task_struct *p,
 		  int this_cpu, int load_idx)
 {
-	struct sched_group *idlest = NULL, *this = NULL, *group = sd->groups;
+	struct sched_group *idlest = NULL, *group = sd->groups;
 	unsigned long min_load = ULONG_MAX, this_load = 0;
 	int imbalance = 100 + (sd->imbalance_pct-100)/2;
 
@@ -1348,7 +1348,6 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
 
 		if (local_group) {
 			this_load = avg_load;
-			this = group;
 		} else if (avg_load < min_load) {
 			min_load = avg_load;
 			idlest = group;
diff --git a/kernel/sys.c b/kernel/sys.c
index e9ad444..7f5a0cd 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -931,6 +931,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
 		pgid = pid;
 	if (pgid < 0)
 		return -EINVAL;
+	rcu_read_lock();
 
 	/* From this point forward we keep holding onto the tasklist lock
 	 * so that our parent does not change from under us. -DaveM
@@ -984,6 +985,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
 out:
 	/* All paths lead to here, thus we are safe. -DaveM */
 	write_unlock_irq(&tasklist_lock);
+	rcu_read_unlock();
 	return err;
 }
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ca38e8e..f88552c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1713,10 +1713,7 @@ static __init int sysctl_init(void)
 {
 	sysctl_set_parent(NULL, root_table);
 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
-	{
-		int err;
-		err = sysctl_check_table(current->nsproxy, root_table);
-	}
+	sysctl_check_table(current->nsproxy, root_table);
 #endif
 	return 0;
 }
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 19cccc3..492197e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2985,13 +2985,11 @@ static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
 
 static void rb_advance_iter(struct ring_buffer_iter *iter)
 {
-	struct ring_buffer *buffer;
 	struct ring_buffer_per_cpu *cpu_buffer;
 	struct ring_buffer_event *event;
 	unsigned length;
 
 	cpu_buffer = iter->cpu_buffer;
-	buffer = cpu_buffer->buffer;
 
 	/*
 	 * Check if we are at the end of the buffer.