perf_counter tools: Consolidate dso methods to load kernel symbols

Now one has just to use dso__load_kernel() optionally passing a vmlinux
filename.

Will make things easier for perf top that will want to pass a callback
to filter some symbols.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Documentation/perf_counter/builtin-report.c

@@ -118,18 +118,13 @@ static void dsos__fprintf(FILE *fp)
 
 static int load_kernel(void)
 {
-	int err = -1;
+	int err;
 
 	kernel_dso = dso__new("[kernel]", 0);
 	if (!kernel_dso)
 		return -1;
 
-	if (vmlinux)
-		err = dso__load_vmlinux(kernel_dso, vmlinux);
-
-	if (err)
-		err = dso__load_kallsyms(kernel_dso);
-
+	err = dso__load_kernel(kernel_dso, vmlinux);
 	if (err) {
 		dso__delete(kernel_dso);
 		kernel_dso = NULL;

Documentation/perf_counter/util/symbol.c

@@ -155,7 +155,7 @@ static int hex2long(char *ptr, unsigned long *long_val)
 	return p - ptr;
 }
 
-int dso__load_kallsyms(struct dso *self)
+static int dso__load_kallsyms(struct dso *self)
 {
 	struct rb_node *nd, *prevnd;
 	char *line = NULL;
@@ -410,7 +410,7 @@ out:
 	return ret;
 }
 
-int dso__load_vmlinux(struct dso *self, const char *vmlinux)
+static int dso__load_vmlinux(struct dso *self, const char *vmlinux)
 {
 	int err, fd = open(vmlinux, O_RDONLY);
 
@@ -423,6 +423,19 @@ int dso__load_vmlinux(struct dso *self, const char *vmlinux)
 	return err;
 }
 
+int dso__load_kernel(struct dso *self, const char *vmlinux)
+{
+	int err = -1;
+
+	if (vmlinux)
+		err = dso__load_vmlinux(self, vmlinux);
+
+	if (err)
+		err = dso__load_kallsyms(self);
+
+	return err;
+}
+
 void symbol__init(void)
 {
 	elf_version(EV_CURRENT);

Documentation/perf_counter/util/symbol.h

@@ -29,8 +29,7 @@ static inline void *dso__sym_priv(struct dso *self, struct symbol *sym)
 
 struct symbol *dso__find_symbol(struct dso *self, uint64_t ip);
 
-int dso__load_kallsyms(struct dso *self);
-int dso__load_vmlinux(struct dso *self, const char *vmlinux);
+int dso__load_kernel(struct dso *self, const char *vmlinux);
 int dso__load(struct dso *self);
 
 size_t dso__fprintf(struct dso *self, FILE *fp);