Coding Style
===

void do_something() { 
... 
#ifdef CONFIG_WORK_HARD 
    do_work_fast(); 
#else 
    do_work_at_your_leisure(); 
#endif 
... 
} 

上述寫法是不好的，應該改成下方

#ifdef CONFIG_WORK_HARD 
    void do_work() { /* Get going, fast! */ ... } 
#else 
    void do_work() { /* Relax, take it easy */ ... } 
#endif
void do_something() { 
... 
    do_work();/* Work hard or not, depending on configuration */ 
... 
}