SMP - lazy FPU

- when a process is migrated to a different CPU it may have an active
  FPU context in the processor registers. We must save it and migrate
  it together with the process.

kernel/system/do_mcontext.c

@@ -43,10 +43,7 @@ PUBLIC int do_getmcontext(struct proc * caller, message * m_ptr)
   mc.mc_fpu_flags = 0;
   if (proc_used_fpu(rp)) {
 	/* make sure that the FPU context is saved into proc structure first */
-	if (fpu_owner == rp) {
-		disable_fpu_exception();
-		save_fpu(rp);
-	}
+	save_fpu(rp);
 	mc.mc_fpu_flags = 0 | rp->p_misc_flags & MF_FPU_INITIALIZED;
 	memcpy(&(mc.mc_fpu_state), rp->p_fpu_state.fpu_save_area_p,
 							FPU_XFP_SIZE);
@@ -92,8 +89,7 @@ PUBLIC int do_setmcontext(struct proc * caller, message * m_ptr)
   } else
 	rp->p_misc_flags &= ~MF_FPU_INITIALIZED;
   /* force reloading FPU in either case */
-  if (fpu_owner == rp)
-	  release_fpu();
+  release_fpu(rp);
 #endif
 
   return(OK);