From: ramya.desai@gmail.com (Ramya Desai)
To: kernelnewbies@lists.kernelnewbies.org
Subject: What is the adventage of macros against function
Date: Wed, 27 Apr 2011 14:16:08 +0530 [thread overview]
Message-ID: <BANLkTimY7UFQy+tEoLmK-bZvU7Uc8cZQtA@mail.gmail.com> (raw)
In-Reply-To: <BANLkTingvD62dCuGLW-4rOrmzMd2uMPwfQ@mail.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
>
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>
next prev parent reply other threads:[~2011-04-27 8:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 8:25 What is the adventage of macros against function İsmail Baydan
2011-04-27 8:46 ` Ramya Desai [this message]
2011-04-27 9:09 ` İsmail Baydan
2011-04-27 12:25 ` Jonathan Neuschäfer
2011-04-27 14:12 ` Ozan Türkyılmaz
2011-04-27 8:57 ` Naveen Kumar
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