OProfile: Fix buffer synchronization for IBS

The patch is needed since there is some IBS code in add_ibs_begin()
that handles more than one sample per iteration. This requires calling
get_slots() during each loop.

This fixes the current problem, but a proper solution that reworks the
cpu buffer synchronization is needed here in the future.

Signed-off-by: Barry Kasindorf <barry.kasindorf@amd.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 33bfa60b0c66..6c0c92a745dd 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -564,9 +564,11 @@ void sync_buffer(int cpu)
         struct task_struct *new;
         unsigned long cookie = 0;
         int in_kernel = 1;
-        unsigned int i;
         sync_buffer_state state = sb_buffer_start;
+#ifndef CONFIG_OPROFILE_IBS
+        unsigned int i;
         unsigned long available;
+#endif
 
         mutex_lock(&buffer_mutex);
 
@@ -574,9 +576,13 @@ void sync_buffer(int cpu)
 
         /* Remember, only we can modify tail_pos */
 
+#ifndef CONFIG_OPROFILE_IBS
         available = get_slots(cpu_buf);
 
         for (i = 0; i < available; ++i) {
+#else
+        while (get_slots(cpu_buf)) {
+#endif
                 struct op_sample *s = &cpu_buf->buffer[cpu_buf->tail_pos];
 
                 if (is_code(s->eip)) {