1 files changed, 41 insertions, 30 deletions

diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 895763f065e9..aacb0f0bc566 100644
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -15,6 +15,7 @@
 #include <linux/workqueue.h>
 #include <linux/cache.h>
 #include <linux/sched.h>
+#include <linux/ring_buffer.h>
 
 struct task_struct;
 
@@ -32,6 +33,12 @@ struct op_sample {
         unsigned long event;
 };
 
+struct op_entry {
+        struct ring_buffer_event *event;
+        struct op_sample *sample;
+        unsigned long irq_flags;
+};
+
 struct oprofile_cpu_buffer {
         volatile unsigned long head_pos;
         volatile unsigned long tail_pos;
@@ -39,7 +46,6 @@ struct oprofile_cpu_buffer {
         struct task_struct *last_task;
         int last_is_kernel;
         int tracing;
-        struct op_sample *buffer;
         unsigned long sample_received;
         unsigned long sample_lost_overflow;
         unsigned long backtrace_aborted;
@@ -48,6 +54,8 @@ struct oprofile_cpu_buffer {
         struct delayed_work work;
 };
 
+extern struct ring_buffer *op_ring_buffer_read;
+extern struct ring_buffer *op_ring_buffer_write;
 DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
 
 /*
@@ -64,46 +72,49 @@ static inline void cpu_buffer_reset(int cpu)
         cpu_buf->last_task = NULL;
 }
 
-static inline
-struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
+static inline int cpu_buffer_write_entry(struct op_entry *entry)
 {
-        return &cpu_buf->buffer[cpu_buf->head_pos];
-}
+        entry->event = ring_buffer_lock_reserve(op_ring_buffer_write,
+                                                sizeof(struct op_sample),
+                                                &entry->irq_flags);
+        if (entry->event)
+                entry->sample = ring_buffer_event_data(entry->event);
+        else
+                entry->sample = NULL;
 
-static inline
-void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)
-{
-        unsigned long new_head = b->head_pos + 1;
+        if (!entry->sample)
+                return -ENOMEM;
 
-        /*
-         * Ensure anything written to the slot before we increment is
-         * visible
-         */
-        wmb();
+        return 0;
+}
 
-        if (new_head < b->buffer_size)
-                b->head_pos = new_head;
-        else
-                b->head_pos = 0;
+static inline int cpu_buffer_write_commit(struct op_entry *entry)
+{
+        return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event,
+                                         entry->irq_flags);
 }
 
-static inline
-struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
+static inline struct op_sample *cpu_buffer_read_entry(int cpu)
 {
-        return &cpu_buf->buffer[cpu_buf->tail_pos];
+        struct ring_buffer_event *e;
+        e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
+        if (e)
+                return ring_buffer_event_data(e);
+        if (ring_buffer_swap_cpu(op_ring_buffer_read,
+                                 op_ring_buffer_write,
+                                 cpu))
+                return NULL;
+        e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
+        if (e)
+                return ring_buffer_event_data(e);
+        return NULL;
 }
 
 /* "acquire" as many cpu buffer slots as we can */
-static inline
-unsigned long cpu_buffer_entries(struct oprofile_cpu_buffer *b)
+static inline unsigned long cpu_buffer_entries(int cpu)
 {
-        unsigned long head = b->head_pos;
-        unsigned long tail = b->tail_pos;
-
-        if (head >= tail)
-                return head - tail;
-
-        return head + (b->buffer_size - tail);
+        return ring_buffer_entries_cpu(op_ring_buffer_read, cpu)
+                + ring_buffer_entries_cpu(op_ring_buffer_write, cpu);
 }
 
 /* transient events for the CPU buffer -> event buffer */