--- a/src/share/vm/gc_implementation/g1/g1RemSet.hpp	Thu Oct 16 10:21:29 2014 +0200
+++ b/src/share/vm/gc_implementation/g1/g1RemSet.hpp	Wed Oct 15 16:02:50 2014 +0200
@@ -97,7 +97,7 @@
   // In the sequential case this param will be ignored.
   void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
                                    CodeBlobToOopClosure* code_root_cl,
-                                   int worker_i);
+                                   uint worker_i);
 
   // Prepare for and cleanup after an oops_into_collection_set_do
   // call.  Must call each of these once before and after (in sequential
@@ -109,9 +109,9 @@
 
   void scanRS(OopsInHeapRegionClosure* oc,
               CodeBlobToOopClosure* code_root_cl,
-              int worker_i);
+              uint worker_i);
 
-  void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i);
+  void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i);
 
   CardTableModRefBS* ct_bs() { return _ct_bs; }
   size_t cardsScanned() { return _total_cards_scanned; }
@@ -138,7 +138,7 @@
   // if the given card contains oops that have references into the
   // current collection set.
   virtual bool refine_card(jbyte* card_ptr,
-                           int worker_i,
+                           uint worker_i,
                            bool check_for_refs_into_cset);
 
   // Print accumulated summary info from the start of the VM.
@@ -171,12 +171,12 @@
 class UpdateRSOopClosure: public ExtendedOopClosure {
   HeapRegion* _from;
   G1RemSet* _rs;
-  int _worker_i;
+  uint _worker_i;
 
   template <class T> void do_oop_work(T* p);
 
 public:
-  UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) :
+  UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) :
     _from(NULL), _rs(rs), _worker_i(worker_i)
   {}