What is the adventage of macros against function

[ibaydan@gmail.com (İsmail Baydan)]

2011/4/27 Ramya Desai <ramya.desai@gmail.com>

> 2011/4/27 ?smail Baydan <ibaydan@gmail.com>:
> > Currently I am trying to learn linux kernel while looking around I saw
> that
> > a lot of function likes macros are defined.What is the adventage of
> macros
> > over functions.
> If the size of the function is very small, then the macro is better
> when compared to function. The macros are replaced at the time of
> preprocessing. However, if there is a function, then there may be
> overhead in calling the function. When there is a call, the return
> address needs to be stored on the stack. This makes some overhead. So,
> if the size of a fucction is big, then define it as function otherwise
> make it as a macro.
>
> I guess, this helps you a bit.
>
> Regards,
> Ramya.
>
> > Thanks
> >
> > --
> > ?smail Baydan
> >
> > _______________________________________________
> > Kernelnewbies mailing list
> > Kernelnewbies at kernelnewbies.org
> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> >
> >
>

thanks

-- 
?smail Baydan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20110427/034f7707/attachment.html