perf annotate: Allow arches to have a init routine and a priv area

Arches like ARM will want to use regular expressions when deciding what
instructions to associate with what ins_ops, provide infrastructure for
that.

Reviewed-by: Ravi Bangoria <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Chris Riyder <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kim Phillips <[e-mail]>
Cc: Markus Trippelsdorf <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Naveen N. Rao <[e-mail]>
Cc: Pawel Moll <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Taeung Song <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/annotate.c

···
 	size_t		nr_instructions_allocated;
 	struct ins_ops  *(*associate_instruction_ops)(struct arch *arch, const char *name);
 	bool		sorted_instructions;
+	bool		initialized;
+	void		*priv;
+	int		(*init)(struct arch *arch);
 	struct		{
 		char comment_char;
 		char skip_functions_char;
···
 	arch = arch__find(arch_name);
 	if (arch == NULL)
 		return -ENOTSUP;
+
+	if (arch->init) {
+		err = arch->init(arch);
+		if (err) {
+			pr_err("%s: failed to initialize %s arch priv area\n", __func__, arch->name);
+			return err;
+		}
+	}
 
 	pr_debug("%s: filename=%s, sym=%s, start=%#" PRIx64 ", end=%#" PRIx64 "\n", __func__,
 		 symfs_filename, sym->name, map->unmap_ip(map, sym->start),