parisc: Use __ro_after_init in process.c

Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/process.c

@@ -192,7 +192,7 @@ int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
  * QEMU idle the host too.
  */
 
-int running_on_qemu __read_mostly;
+int running_on_qemu __ro_after_init;
 EXPORT_SYMBOL(running_on_qemu);
 
 void __cpuidle arch_cpu_idle_dead(void)