[PATCH 7/7] perf hists browser: Simplify zooming code a bit

[Namhyung Kim <namhyung@kernel.org>]

Introduce pstack_peek() and reuse do_zoom_dso/thread() function.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/ui/browsers/hists.c | 16 +++++-----------
 tools/perf/util/pstack.c       |  7 +++++++
 tools/perf/util/pstack.h       |  1 +
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 315ebc493508..b776c2389137 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1877,17 +1877,11 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 					goto out_free_stack;
 				continue;
 			}
-			top = pstack__pop(fstack);
-			if (top == &browser->hists->dso_filter) {
-				perf_hpp__set_elide(HISTC_DSO, false);
-				browser->hists->dso_filter = NULL;
-				ui_helpline__pop();
-			}
-			if (top == &browser->hists->thread_filter) {
-				perf_hpp__set_elide(HISTC_THREAD, false);
-				thread__zput(browser->hists->thread_filter);
-				ui_helpline__pop();
-			}
+			top = pstack__peek(fstack);
+			if (top == &browser->hists->dso_filter)
+				do_zoom_dso(opts, browser, hbt, fstack, env);
+			if (top == &browser->hists->thread_filter)
+				do_zoom_thread(opts, browser, hbt, fstack, env);
 			continue;
 		}
 		case K_ESC:
diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c
index a126e6cc6e73..b234a6e3d0d4 100644
--- a/tools/perf/util/pstack.c
+++ b/tools/perf/util/pstack.c
@@ -74,3 +74,10 @@ void *pstack__pop(struct pstack *pstack)
 	pstack->entries[pstack->top] = NULL;
 	return ret;
 }
+
+void *pstack__peek(struct pstack *pstack)
+{
+	if (pstack->top == 0)
+		return NULL;
+	return pstack->entries[pstack->top - 1];
+}
diff --git a/tools/perf/util/pstack.h b/tools/perf/util/pstack.h
index c3cb6584d527..ded7f2e36624 100644
--- a/tools/perf/util/pstack.h
+++ b/tools/perf/util/pstack.h
@@ -10,5 +10,6 @@ bool pstack__empty(const struct pstack *pstack);
 void pstack__remove(struct pstack *pstack, void *key);
 void pstack__push(struct pstack *pstack, void *key);
 void *pstack__pop(struct pstack *pstack);
+void *pstack__peek(struct pstack *pstack);
 
 #endif /* _PERF_PSTACK_ */
-- 
2.3.5