perf symbols: Split helpers used when creating kernel dso object

To make it clear and allow for direct usage by, for instance,
regression test suites.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1264633557-17597-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 21 insertions, 7 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 26ec603083e0..f9049d12ead6 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1762,24 +1762,38 @@ size_t dsos__fprintf_buildid(FILE *fp, bool with_hits)
                 __dsos__fprintf_buildid(&dsos__user, fp, with_hits));
 }
 
+struct dso *dso__new_kernel(const char *name)
+{
+        struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
+
+        if (self != NULL) {
+                self->short_name = "[kernel]";
+                self->kernel     = 1;
+        }
+
+        return self;
+}
+
+void dso__read_running_kernel_build_id(struct dso *self)
+{
+        if (sysfs__read_build_id("/sys/kernel/notes", self->build_id,
+                                 sizeof(self->build_id)) == 0)
+                self->has_build_id = true;
+}
+
 static struct dso *dsos__create_kernel(const char *vmlinux)
 {
-        struct dso *kernel = dso__new(vmlinux ?: "[kernel.kallsyms]");
+        struct dso *kernel = dso__new_kernel(vmlinux);
 
         if (kernel == NULL)
                 return NULL;
 
-        kernel->short_name = "[kernel]";
-        kernel->kernel     = 1;
-
         vdso = dso__new("[vdso]");
         if (vdso == NULL)
                 goto out_delete_kernel_dso;
         dso__set_loaded(vdso, MAP__FUNCTION);
 
-        if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
-                                 sizeof(kernel->build_id)) == 0)
-                kernel->has_build_id = true;
+        dso__read_running_kernel_build_id(kernel);
 
         dsos__add(&dsos__kernel, kernel);
         dsos__add(&dsos__user, vdso);