perf tools: Use DECLARE_BITMAP instead of an open-coded array

Use DECLARE_BITMAP instead of an open coded array for our bitmap
of featured sections.

This makes the array an unsigned long instead of a u64 but since
we use a 256 bits bitmap, the array size shouldn't vary between
different boxes.

Signed-off-by: Frederic Weisbecker <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Mike Galbraith <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
LKML-Reference: <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>

tools/perf/util/header.c

···
 #include "../perf.h"
 #include "trace-event.h"
 
-#include <linux/bitmap.h>
-
 /*
  * Create new perf.data header attribute:
  */
···
 	struct perf_file_section	attrs;
 	struct perf_file_section	data;
 	struct perf_file_section	event_types;
-	feat_mask_t			adds_features;
+	DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
 };
 
 void perf_header__feat_trace_info(struct perf_header *header)
 {
-	set_bit(HEADER_TRACE_INFO, perf_header__adds_mask(header));
+	set_bit(HEADER_TRACE_INFO, header->adds_features);
 }
 
 static void do_write(int fd, void *buf, size_t size)
···
 {
 	struct perf_file_section trace_sec;
 	u64 cur_offset = lseek(fd, 0, SEEK_CUR);
-	unsigned long *feat_mask = perf_header__adds_mask(self);
+	unsigned long *feat_mask = self->adds_features;
 
 	if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
 		/* Write trace info */
···
 		},
 	};
 
-	memcpy(&f_header.adds_features, &self->adds_features, sizeof(feat_mask_t));
+	memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 
 	lseek(fd, 0, SEEK_SET);
 	do_write(fd, &f_header, sizeof(f_header));
···
 
 static void perf_header__adds_read(struct perf_header *self, int fd)
 {
-	const unsigned long *feat_mask = perf_header__adds_mask(self);
+	const unsigned long *feat_mask = self->adds_features;
 
 	if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
 		struct perf_file_section trace_sec;
···
 
 	if (f_header.size != sizeof(f_header)) {
 		/* Support the previous format */
-		if (f_header.size == offsetof(typeof(f_header), adds_features)) {
-			unsigned long *mask = (unsigned long *)(void *)
-					&f_header.adds_features;
-			bitmap_zero(mask, HEADER_FEAT_BITS);
-		} else
+		if (f_header.size == offsetof(typeof(f_header), adds_features))
+			bitmap_zero(f_header.adds_features, HEADER_FEAT_BITS);
+		else
 			die("incompatible file format");
 	}
 	nr_attrs = f_header.attrs.size / sizeof(f_attr);
···
 		event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 	}
 
-	memcpy(&self->adds_features, &f_header.adds_features, sizeof(feat_mask_t));
+	memcpy(&self->adds_features, &f_header.adds_features, sizeof(f_header.adds_features));
 
 	perf_header__adds_read(self, fd);
 

tools/perf/util/header.h

···
 #include <sys/types.h>
 #include "types.h"
 
+#include <linux/bitmap.h>
+
 struct perf_header_attr {
 	struct perf_event_attr attr;
 	int ids, size;
···
 
 #define HEADER_FEAT_BITS			256
 
-typedef	typeof(u64[HEADER_FEAT_BITS / 8])	feat_mask_t;
-
 struct perf_header {
 	int			frozen;
 	int			attrs, size;
···
 	u64			data_size;
 	u64			event_offset;
 	u64			event_size;
-	feat_mask_t		adds_features;
+	DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
 };
-
-static inline unsigned long *perf_header__adds_mask(struct perf_header *self)
-{
-	return (unsigned long *)(void *)&self->adds_features;
-}
 
 struct perf_header *perf_header__read(int fd);
 void perf_header__write(struct perf_header *self, int fd);

tools/perf/util/include/asm/asm-offsets.h

···
+/* stub */

tools/perf/util/include/linux/types.h

···
-/* stub */
+#ifndef _PERF_LINUX_TYPES_H_
+#define _PERF_LINUX_TYPES_H_
+
+#define DECLARE_BITMAP(name,bits) \
+	unsigned long name[BITS_TO_LONGS(bits)]
+
+#endif