perf machine: Add kernel_dso() method

To reduce boilerplate in some places.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-9s1bgoxxhlnu037e1nqx0tw3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 24d9e28..e768ef2 100644 (file)
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -42,6 +42,11 @@
 
 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
 
+static struct dso *machine__kernel_dso(struct machine *machine)
+{
+       return machine->vmlinux_map->dso;
+}
+
 static void dsos__init(struct dsos *dsos)
 {
        INIT_LIST_HEAD(&dsos->head);
@@ -861,7 +866,7 @@ size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 {
        int i;
        size_t printed = 0;
-       struct dso *kdso = machine__kernel_map(machine)->dso;
+       struct dso *kdso = machine__kernel_dso(machine);
 
        if (kdso->has_build_id) {
                char filename[PATH_MAX];
@@ -1543,8 +1548,7 @@ static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
 static int machine__process_extra_kernel_map(struct machine *machine,
                                             union perf_event *event)
 {
-       struct map *kernel_map = machine__kernel_map(machine);
-       struct dso *kernel = kernel_map ? kernel_map->dso : NULL;
+       struct dso *kernel = machine__kernel_dso(machine);
        struct extra_kernel_map xm = {
                .start = event->mmap.start,
                .end   = event->mmap.start + event->mmap.len,