- * If there are multiple online CPUs then wait until all threads whose
- * FP mode is about to change have been context switched. This approach
- * allows us to only worry about whether an FP mode switch is in
- * progress when FP is first used in a tasks time slice. Pretty much all
- * of the mode switch overhead can thus be confined to cases where mode
- * switches are actually occurring. That is, to here. However for the
- * thread performing the mode switch it may take a while...
+ * If there are multiple online CPUs then force any which are running
+ * threads in this process to lose their FPU context, which they can't
+ * regain until fp_mode_switching is cleared later.