oprofile: moving cpu_buffer_reset() to cpu_buffer.h

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

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

diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index aed286c..944a583 100644 (file)
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -548,6 +548,7 @@ void sync_buffer(int cpu)
 
        /* Remember, only we can modify tail_pos */
 
+       cpu_buffer_reset(cpu);
 #ifndef CONFIG_OPROFILE_IBS
        available = cpu_buffer_entries(cpu_buf);
 

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index d6f5de6..5cf7efe 100644 (file)
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -124,18 +124,6 @@ void end_cpu_work(void)
        flush_scheduled_work();
 }
 
-/* Resets the cpu buffer to a sane state. */
-void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf)
-{
-       /*
-        * reset these to invalid values; the next sample collected
-        * will populate the buffer with proper values to initialize
-        * the buffer
-        */
-       cpu_buf->last_is_kernel = -1;
-       cpu_buf->last_task = NULL;
-}
-
 /* compute number of available slots in cpu_buffer queue */
 static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
 {

diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index 6055b56..895763f 100644 (file)
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -50,7 +50,19 @@ struct oprofile_cpu_buffer {
 
 DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
 
-void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
+/*
+ * Resets the cpu buffer to a sane state.
+ *
+ * reset these to invalid values; the next sample collected will
+ * populate the buffer with proper values to initialize the buffer
+ */
+static inline void cpu_buffer_reset(int cpu)
+{
+       struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
+
+       cpu_buf->last_is_kernel = -1;
+       cpu_buf->last_task = NULL;
+}
 
 static inline
 struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
@@ -88,20 +100,6 @@ unsigned long cpu_buffer_entries(struct oprofile_cpu_buffer *b)
        unsigned long head = b->head_pos;
        unsigned long tail = b->tail_pos;
 
-       /*
-        * Subtle. This resets the persistent last_task
-        * and in_kernel values used for switching notes.
-        * BUT, there is a small window between reading
-        * head_pos, and this call, that means samples
-        * can appear at the new head position, but not
-        * be prefixed with the notes for switching
-        * kernel mode or a task switch. This small hole
-        * can lead to mis-attribution or samples where
-        * we don't know if it's in the kernel or not,
-        * at the start of an event buffer.
-        */
-       cpu_buffer_reset(b);
-
        if (head >= tail)
                return head - tail;