FPU cleanup

- last reference to MF_USED_FPU removed

- proc_used_fpu() used to test for MF_FPU_INITIALIZED

kernel/system/do_fork.c

@@ -67,7 +67,7 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
 #if (_MINIX_CHIP == _CHIP_INTEL)
   rpc->p_seg.p_ldt_sel = old_ldt_sel;	/* restore descriptors */
   rpc->p_fpu_state.fpu_save_area_p = old_fpu_save_area_p;
-  if(rpp->p_misc_flags & MF_FPU_INITIALIZED)
+  if(proc_used_fpu(rpp)) {
 	memcpy(rpc->p_fpu_state.fpu_save_area_p,
 	       rpp->p_fpu_state.fpu_save_area_p,
 	       FPU_XFP_SIZE);

kernel/system/do_mcontext.c

@@ -29,7 +29,7 @@ PUBLIC int do_getmcontext(struct proc * caller, message * m_ptr)
   rp = proc_addr(proc_nr);
 
 #if (_MINIX_CHIP == _CHIP_INTEL)
-  if (!(rp->p_misc_flags & MF_FPU_INITIALIZED)) 
+  if (!proc_used_fpu(rp)) {
 	return(OK);	/* No state to copy */
 #endif
 
@@ -41,7 +41,7 @@ PUBLIC int do_getmcontext(struct proc * caller, message * m_ptr)
 #if (_MINIX_CHIP == _CHIP_INTEL)
   /* Copy FPU state */
   mc.mc_fpu_flags = 0;
-  if (rp->p_misc_flags & MF_FPU_INITIALIZED) {
+  if (proc_used_fpu(rp)) {
 	/* make sure that the FPU context is saved into proc structure first */
 	if (fpu_owner == rp) {
 		disable_fpu_exception();

kernel/system/do_sigsend.c

@@ -44,7 +44,7 @@ PUBLIC int do_sigsend(struct proc * caller, message * m_ptr)
   /* Copy the registers to the sigcontext structure. */
   memcpy(&sc.sc_regs, (char *) &rp->p_reg, sizeof(sigregs));
   #if (_MINIX_CHIP == _CHIP_INTEL)
-    if(rp->p_misc_flags & MF_FPU_INITIALIZED) {
+    if(proc_used_fpu(rp)) {
 	    /* save the FPU context before saving it to the sig context */
 	    if (fpu_owner == rp) {
 		    disable_fpu_exception();