diff --git a/ompi/mca/btl/mvapi/btl_mvapi_endpoint.h b/ompi/mca/btl/mvapi/btl_mvapi_endpoint.h
index 4077e7d825..54832a93a2 100644
--- a/ompi/mca/btl/mvapi/btl_mvapi_endpoint.h
+++ b/ompi/mca/btl/mvapi/btl_mvapi_endpoint.h
@@ -212,7 +212,7 @@ void mca_btl_mvapi_post_recv(void);
     uint32_t post_rr_sub_i; \
     int post_rr_sub_rc; \
     opal_list_item_t* post_rr_sub_item; \
-    mca_btl_mvapi_frag_t* post_rr_sub_frag; \
+    mca_btl_mvapi_frag_t* post_rr_sub_frag = NULL; \
     mca_btl_mvapi_module_t *post_rr_sub_mvapi_btl = post_rr_sub_endpoint->endpoint_btl; \
     VAPI_rr_desc_t* post_rr_sub_desc_post = post_rr_sub_mvapi_btl->rr_desc_post; \
     for(post_rr_sub_i = 0; post_rr_sub_i < post_rr_sub_cnt; post_rr_sub_i++) { \
@@ -228,10 +228,10 @@ void mca_btl_mvapi_post_recv(void);
                                                 post_rr_sub_qp, \
                                                 post_rr_sub_cnt, \
                                                 post_rr_sub_desc_post); \
-    if(VAPI_OK != post_rr_sub_frag->ret) { \
+   if(NULL != post_rr_sub_frag && VAPI_OK != post_rr_sub_frag->ret) { \
         BTL_ERROR(("error posting receive descriptors: %s",\
                    VAPI_strerror(post_rr_sub_frag->ret))); \
-    } else {\
+    } else if (NULL != post_rr_sub_frag){\
         OPAL_THREAD_ADD32(post_rr_sub_rr_posted, post_rr_sub_cnt); \
    }\
 }
diff --git a/ompi/mca/mpool/base/base.h b/ompi/mca/mpool/base/base.h
index 77679ba7e6..2b8ee34dc1 100644
--- a/ompi/mca/mpool/base/base.h
+++ b/ompi/mca/mpool/base/base.h
@@ -31,13 +31,13 @@
 extern "C" {
 #endif
 
-static inline unsigned long my_log2(unsigned long val) { 
-    unsigned long count = -1;
+static inline unsigned int my_log2(unsigned long val) { 
+    unsigned int count = 0;
     while(val > 0) { 
         val = val >> 1; 
         count++;
     }
-    return count;
+    return count > 0 ? count-1: 0;
 }
 static inline void *down_align_addr(void* addr, unsigned int shift) {
     return (void*) (((unsigned long) addr) & (~(unsigned long) 0) << shift); 
diff --git a/ompi/mca/mpool/base/mpool_base_mem_cb.c b/ompi/mca/mpool/base/mpool_base_mem_cb.c
index 0c670e3e48..b67e52050a 100644
--- a/ompi/mca/mpool/base/mpool_base_mem_cb.c
+++ b/ompi/mca/mpool/base/mpool_base_mem_cb.c
@@ -62,7 +62,7 @@ void mca_mpool_base_mem_cb(void* base, size_t size, void* cbdata)
                 for(i = 0; i < cnt; i++) { 
                 
                     reg = (mca_mpool_base_registration_t*)ompi_pointer_array_get_item(&regs, i);
-                    if(base_addr < reg->bound) { 
+                    if(base_addr < (void*) reg->bound) { 
                         base_addr = down_align_addr( reg->bound, mca_mpool_base_page_size_log ); 
                     }
                     current->mpool_module->mpool_deregister(current->mpool_module, reg);