--- a/src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp	Fri Jun 22 17:36:03 2018 -0700
+++ b/src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp	Fri Jun 22 17:49:21 2018 -0700
@@ -96,11 +96,11 @@
 address os::current_stack_pointer() {
 #ifdef SPARC_WORKS
   register void *esp;
-  __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp));
+  __asm__("mov %%" SPELL_REG_SP ", %0":"=r"(esp));
   return (address) ((char*)esp + sizeof(long)*2);
 #elif defined(__clang__)
   intptr_t* esp;
-  __asm__ __volatile__ ("mov %%"SPELL_REG_SP", %0":"=r"(esp):);
+  __asm__ __volatile__ ("mov %%" SPELL_REG_SP ", %0":"=r"(esp):);
   return (address) esp;
 #else
   register void *esp __asm__ (SPELL_REG_SP);
@@ -234,10 +234,10 @@
 intptr_t* _get_previous_fp() {
 #ifdef SPARC_WORKS
   register intptr_t **ebp;
-  __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp));
+  __asm__("mov %%" SPELL_REG_FP ", %0":"=r"(ebp));
 #elif defined(__clang__)
   intptr_t **ebp;
-  __asm__ __volatile__ ("mov %%"SPELL_REG_FP", %0":"=r"(ebp):);
+  __asm__ __volatile__ ("mov %%" SPELL_REG_FP ", %0":"=r"(ebp):);
 #else
   register intptr_t **ebp __asm__ (SPELL_REG_FP);
 #endif

--- a/src/hotspot/share/utilities/debug.cpp	Fri Jun 22 17:36:03 2018 -0700
+++ b/src/hotspot/share/utilities/debug.cpp	Fri Jun 22 17:49:21 2018 -0700
@@ -714,16 +714,13 @@
   }
 }
 
-static bool store_context(const void* context) {
-  if (memcpy(&g_stored_assertion_context, context, sizeof(ucontext_t)) == false) {
-    return false;
-  }
+static void store_context(const void* context) {
+  memcpy(&g_stored_assertion_context, context, sizeof(ucontext_t));
 #if defined(__linux) && defined(PPC64)
   // on Linux ppc64, ucontext_t contains pointers into itself which have to be patched up
   //  after copying the context (see comment in sys/ucontext.h):
   *((void**) &g_stored_assertion_context.uc_mcontext.regs) = &(g_stored_assertion_context.uc_mcontext.gp_regs);
 #endif
-  return true;
 }
 
 bool handle_assert_poison_fault(const void* ucVoid, const void* faulting_address) {
@@ -734,9 +731,8 @@
     if (ucVoid) {
       const intx my_tid = os::current_thread_id();
       if (Atomic::cmpxchg(my_tid, &g_asserting_thread, (intx)0) == 0) {
-        if (store_context(ucVoid)) {
-          g_assertion_context = &g_stored_assertion_context;
-        }
+        store_context(ucVoid);
+        g_assertion_context = &g_stored_assertion_context;
       }
     }
     return true;