perf machine: Simplify accessing the host machine

It is always there, no sense in calling a function named
"perf_session__find_host_machine".

Also no sense in checking if that function return is NULL, so ditch
needless error handling.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-a6a3zx3afbrxo8p2zqm5mxo8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

5 files changed, 5 insertions, 21 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 0b4b796167be..9fddca749ca2 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -340,7 +340,7 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
                            int n_lines, int is_caller)
 {
         struct rb_node *next;
-        struct machine *machine;
+        struct machine *machine = &session->machines.host;
 
         printf("%.102s\n", graph_dotted_line);
         printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
@@ -349,11 +349,6 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 
         next = rb_first(root);
 
-        machine = perf_session__find_host_machine(session);
-        if (!machine) {
-                pr_err("__print_result: couldn't find kernel information\n");
-                return;
-        }
         while (next && n_lines--) {
                 struct alloc_stat *data = rb_entry(next, struct alloc_stat,
                                                    node);
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index a0b2427b509d..2ac690cad411 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -512,12 +512,7 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 
         rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
 
-        machine = perf_session__find_host_machine(session);
-        if (!machine) {
-                pr_err("Couldn't find native kernel information.\n");
-                err = -1;
-                goto out_delete_session;
-        }
+        machine = &session->machines.host;
 
         if (opts->pipe_output) {
                 err = perf_event__synthesize_attrs(tool, session,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index e0ecebdde3fe..bc788126397b 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -847,13 +847,13 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
                         ++top->us_samples;
                         if (top->hide_user_symbols)
                                 continue;
-                        machine = perf_session__find_host_machine(session);
+                        machine = &session->machines.host;
                         break;
                 case PERF_RECORD_MISC_KERNEL:
                         ++top->kernel_samples;
                         if (top->hide_kernel_symbols)
                                 continue;
-                        machine = perf_session__find_host_machine(session);
+                        machine = &session->machines.host;
                         break;
                 case PERF_RECORD_MISC_GUEST_KERNEL:
                         ++top->guest_kernel_samples;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 046b057c8f7f..bd85280bb6e8 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -821,7 +821,7 @@ static struct machine *
                 return perf_session__findnew_machine(session, pid);
         }
 
-        return perf_session__find_host_machine(session);
+        return &session->machines.host;
 }
 
 static int perf_session_deliver_event(struct perf_session *session,
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index de4e68716626..b5c0847edfa9 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -75,12 +75,6 @@ void perf_session__set_id_hdr_size(struct perf_session *session);
 void perf_session__remove_thread(struct perf_session *self, struct thread *th);
 
 static inline
-struct machine *perf_session__find_host_machine(struct perf_session *self)
-{
-        return &self->machines.host;
-}
-
-static inline
 struct machine *perf_session__find_machine(struct perf_session *self, pid_t pid)
 {
         return machines__find(&self->machines, pid);