5 files changed, 42 insertions, 5 deletions

diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 9da5a4b81133..c3ea5fa7d05a 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -38,7 +38,7 @@
 
 static LIST_HEAD(dying_tasks);
 static LIST_HEAD(dead_tasks);
-static cpumask_t marked_cpus = CPU_MASK_NONE;
+static cpumask_var_t marked_cpus;
 static DEFINE_SPINLOCK(task_mortuary);
 static void process_task_mortuary(void);
 
@@ -456,10 +456,10 @@ static void mark_done(int cpu)
 {
         int i;
 
-        cpu_set(cpu, marked_cpus);
+        cpumask_set_cpu(cpu, marked_cpus);
 
         for_each_online_cpu(i) {
-                if (!cpu_isset(i, marked_cpus))
+                if (!cpumask_test_cpu(i, marked_cpus))
                         return;
         }
 
@@ -468,7 +468,7 @@ static void mark_done(int cpu)
          */
         process_task_mortuary();
 
-        cpus_clear(marked_cpus);
+        cpumask_clear(marked_cpus);
 }
 
 
@@ -565,6 +565,20 @@ void sync_buffer(int cpu)
         mutex_unlock(&buffer_mutex);
 }
 
+int __init buffer_sync_init(void)
+{
+        if (!alloc_cpumask_var(&marked_cpus, GFP_KERNEL))
+                return -ENOMEM;
+
+        cpumask_clear(marked_cpus);
+                return 0;
+}
+
+void __exit buffer_sync_cleanup(void)
+{
+        free_cpumask_var(marked_cpus);
+}
+
 /* The function can be used to add a buffer worth of data directly to
  * the kernel buffer. The buffer is assumed to be a circular buffer.
  * Take the entries from index start and end at index end, wrapping
diff --git a/drivers/oprofile/buffer_sync.h b/drivers/oprofile/buffer_sync.h
index 3110732c1835..0ebf5db62679 100644
--- a/drivers/oprofile/buffer_sync.h
+++ b/drivers/oprofile/buffer_sync.h
@@ -19,4 +19,8 @@ void sync_stop(void);
 /* sync the given CPU's buffer */
 void sync_buffer(int cpu);
 
+/* initialize/destroy the buffer system. */
+int buffer_sync_init(void);
+void buffer_sync_cleanup(void);
+
 #endif /* OPROFILE_BUFFER_SYNC_H */
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 2e03b6d796d3..e76d715e4342 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -393,16 +393,21 @@ oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs,
         return;
 
 fail:
+        entry->event = NULL;
         cpu_buf->sample_lost_overflow++;
 }
 
 int oprofile_add_data(struct op_entry *entry, unsigned long val)
 {
+        if (!entry->event)
+                return 0;
         return op_cpu_buffer_add_data(entry, val);
 }
 
 int oprofile_write_commit(struct op_entry *entry)
 {
+        if (!entry->event)
+                return -EINVAL;
         return op_cpu_buffer_write_commit(entry);
 }
 
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 63f81c44846a..272995d20293 100644
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -66,6 +66,13 @@ static inline void op_cpu_buffer_reset(int cpu)
         cpu_buf->last_task = NULL;
 }
 
+/*
+ * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be
+ * called only if op_cpu_buffer_write_reserve() did not return NULL or
+ * entry->event != NULL, otherwise entry->size or entry->event will be
+ * used uninitialized.
+ */
+
 struct op_sample
 *op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
 int op_cpu_buffer_write_commit(struct op_entry *entry);
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index 3cffce90f82a..ced39f602292 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -183,6 +183,10 @@ static int __init oprofile_init(void)
 {
         int err;
 
+        err = buffer_sync_init();
+        if (err)
+                return err;
+
         err = oprofile_arch_init(&oprofile_ops);
 
         if (err < 0 || timer) {
@@ -191,8 +195,10 @@ static int __init oprofile_init(void)
         }
 
         err = oprofilefs_register();
-        if (err)
+        if (err) {
                 oprofile_arch_exit();
+                buffer_sync_cleanup();
+        }
 
         return err;
 }
@@ -202,6 +208,7 @@ static void __exit oprofile_exit(void)
 {
         oprofilefs_unregister();
         oprofile_arch_exit();
+        buffer_sync_cleanup();
 }