perf: Rename perf_mmap_data to perf_buffer

Rename to clarify code.

s/perf_mmap_data/perf_buffer/g and selective s/data/buffer/g
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/perf_event.h

@@ -602,7 +602,7 @@ enum perf_event_active_state {
 
 struct file;
 
-struct perf_mmap_data {
+struct perf_buffer {
 	atomic_t			refcount;
 	struct rcu_head			rcu_head;
 #ifdef CONFIG_PERF_USE_VMALLOC
@@ -727,7 +727,7 @@ struct perf_event {
 	atomic_t			mmap_count;
 	int				mmap_locked;
 	struct user_struct		*mmap_user;
-	struct perf_mmap_data		*data;
+	struct perf_buffer		*buffer;
 
 	/* poll related */
 	wait_queue_head_t		waitq;
@@ -825,7 +825,7 @@ struct perf_cpu_context {
 
 struct perf_output_handle {
 	struct perf_event		*event;
-	struct perf_mmap_data		*data;
+	struct perf_buffer		*buffer;
 	unsigned long			wakeup;
 	unsigned long			size;
 	void				*addr;