gc.c: fix no lazy sweep mode

* gc.c (gc_sweep_rest): sweep rest pages regardless of whether
  lazy sweep is enabled or not.  based on the patch by Masahiro
  Ide at [ruby-dev:48706].  [Bug #10431]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Mon Oct 27 13:40:11 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* gc.c (gc_sweep_rest): sweep rest pages regardless of whether
+	  lazy sweep is enabled or not.  based on the patch by Masahiro
+	  Ide at [ruby-dev:48706].  [Bug #10431]
+
 Mon Oct 27 11:18:32 2014  Eric Wong  <e@80x24.org>
 
 	* test/ruby/test_process.rb (test_deadlock_by_signal_at_forking):

gc.c

@@ -700,7 +700,8 @@ VALUE *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
 #else
 #define is_incremental_marking(objspace) 0
 #endif
-#define is_lazy_sweeping(heap)           (GC_ENABLE_LAZY_SWEEP       && (heap)->sweep_pages != 0)
+#define has_sweeping_pages(heap)         ((heap)->sweep_pages != 0)
+#define is_lazy_sweeping(heap)           (GC_ENABLE_LAZY_SWEEP && has_sweeping_pages(heap))
 #if GC_ENABLE_INCREMENTAL_MARK
 #define will_be_incremental_marking(objspace) ((objspace)->rgengc.need_major_gc != GPR_FLAG_NONE)
 #else
@@ -3315,10 +3316,8 @@ gc_sweep_rest(rb_objspace_t *objspace)
 {
     rb_heap_t *heap = heap_eden; /* lazy sweep only for eden */
 
-    if (is_lazy_sweeping(heap)) {
+    while (has_sweeping_pages(heap)) {
-	while (is_lazy_sweeping(heap)) {
+	gc_sweep_step(objspace, heap);
-	    gc_sweep_step(objspace, heap);
-	}
     }
 }