oprofile: adding cpu_buffer_write_commit()

This is in preparation for changes in the cpu buffer implementation.

Signed-off-by: Robert Richter <robert.richter@amd.com>

2 files changed, 18 insertions, 17 deletions

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 7e5e650e409f..d6f5de686363 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -148,22 +148,6 @@ static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
         return tail + (b->buffer_size - head) - 1;
 }
 
-static void increment_head(struct oprofile_cpu_buffer *b)
-{
-        unsigned long new_head = b->head_pos + 1;
-
-        /*
-         * Ensure anything written to the slot before we increment is
-         * visible
-         */
-        wmb();
-
-        if (new_head < b->buffer_size)
-                b->head_pos = new_head;
-        else
-                b->head_pos = 0;
-}
-
 static inline void
 add_sample(struct oprofile_cpu_buffer *cpu_buf,
            unsigned long pc, unsigned long event)
@@ -171,7 +155,7 @@ add_sample(struct oprofile_cpu_buffer *cpu_buf,
         struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);
         entry->eip = pc;
         entry->event = event;
-        increment_head(cpu_buf);
+        cpu_buffer_write_commit(cpu_buf);
 }
 
 static inline void
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 08706991fdd2..e6089768ae66 100644
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -59,6 +59,23 @@ struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
 }
 
 static inline
+void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)
+{
+        unsigned long new_head = b->head_pos + 1;
+
+        /*
+         * Ensure anything written to the slot before we increment is
+         * visible
+         */
+        wmb();
+
+        if (new_head < b->buffer_size)
+                b->head_pos = new_head;
+        else
+                b->head_pos = 0;
+}
+
+static inline
 struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
 {
         return &cpu_buf->buffer[cpu_buf->tail_pos];