On sparc64, flush_thread needs to setup the PGD cache

for 64-bit apps too.

arch/sparc64/kernel/process.c

@@ -424,10 +424,10 @@ void flush_thread(void)
 	struct thread_info *t = current_thread_info();
 
 	if (t->task->mm) {
+		unsigned long pgd_cache = 0UL;
 		if (test_thread_flag(TIF_32BIT)) {
 			struct mm_struct *mm = t->task->mm;
 			pgd_t *pgd0 = &mm->pgd[0];
-			unsigned long pgd_cache;
 
 			if (pgd_none(*pgd0)) {
 				pmd_t *page = pmd_alloc_one_fast(NULL, 0);
@@ -436,13 +436,13 @@ void flush_thread(void)
 				pgd_set(pgd0, page);
 			}
 			pgd_cache = pgd_val(*pgd0) << 11UL;
-			__asm__ __volatile__("stxa %0, [%1] %2\n\t"
-					     "membar #Sync"
-					     : /* no outputs */
-					     : "r" (pgd_cache),
-					       "r" (TSB_REG),
-					       "i" (ASI_DMMU));
 		}
+		__asm__ __volatile__("stxa %0, [%1] %2\n\t"
+				     "membar #Sync"
+				     : /* no outputs */
+				     : "r" (pgd_cache),
+				     "r" (TSB_REG),
+				     "i" (ASI_DMMU));
 	}
 	set_thread_wsaved(0);