--- a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp	Wed May 16 12:38:34 2018 +0200
+++ b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp	Wed May 16 12:38:35 2018 +0200
@@ -1232,7 +1232,7 @@
   // This means the original constant pool contents are copied unmodified
   writer.bytes(orig_stream->buffer(), orig_access_flag_offset);
   assert(writer.is_valid(), "invariant");
-  assert(writer.current_offset() == orig_access_flag_offset, "invariant"); // same positions
+  assert(writer.current_offset() == (intptr_t)orig_access_flag_offset, "invariant"); // same positions
   // Our writer now sits just after the last original constant pool entry.
   // I.e. we are in a good position to append new constant pool entries
   // This array will contain the resolved indexes

--- a/src/hotspot/share/jfr/recorder/stringpool/jfrStringPoolBuffer.cpp	Wed May 16 12:38:34 2018 +0200
+++ b/src/hotspot/share/jfr/recorder/stringpool/jfrStringPoolBuffer.cpp	Wed May 16 12:38:35 2018 +0200
@@ -55,7 +55,17 @@
 }
 
 void JfrStringPoolBuffer::increment(uint64_t value) {
+#if !(defined(ARM) || defined(IA32))
   Atomic::add(value, &_string_count_pos);
+#else
+  // TODO: This should be fixed in Atomic::add handling for 32-bit platforms,
+  // see JDK-8203283. We workaround the absence of support right here.
+  uint64_t cur, val;
+  do {
+     cur = Atomic::load(&_string_count_top);
+     val = cur + value;
+  } while (Atomic::cmpxchg(val, &_string_count_pos, cur) != cur);
+#endif
 }
 
 void JfrStringPoolBuffer::set_string_top(uint64_t value) {

--- a/src/hotspot/share/jfr/utilities/jfrAllocation.cpp	Wed May 16 12:38:34 2018 +0200
+++ b/src/hotspot/share/jfr/utilities/jfrAllocation.cpp	Wed May 16 12:38:35 2018 +0200
@@ -66,8 +66,8 @@
     const size_t total_deallocated = atomic_add_jlong(dealloc_size, &_deallocated_bytes);
     const size_t current_live_set = atomic_add_jlong(dealloc_size * -1, &_live_set_bytes);
     log_trace(jfr, system)("Deallocation: [" SIZE_FORMAT "] bytes", dealloc_size);
-    log_trace(jfr, system)("Total dealloc [" JLONG_FORMAT "] bytes", total_deallocated);
-    log_trace(jfr, system)("Liveset:      [" JLONG_FORMAT "] bytes", current_live_set);
+    log_trace(jfr, system)("Total dealloc [" SIZE_FORMAT "] bytes", total_deallocated);
+    log_trace(jfr, system)("Liveset:      [" SIZE_FORMAT "] bytes", current_live_set);
   }
 }