linux-kernel - Re: C++ in linux kernel

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Date:	Sat, 9 Feb 2008 09:45:26 +0900
From:	"Joonwoo Park" <joonwpark81@...il.com>
To:	"Jan Engelhardt" <jengelh@...putergmbh.de>
Cc:	"rohit h" <hrohit85@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: C++ in linux kernel

2008/2/9, Jan Engelhardt <jengelh@...putergmbh.de>:
>
> On Feb 9 2008 00:14, Joonwoo Park wrote:
> >2008/2/8, rohit h <hrohit85@...il.com>:
> >> Hi,
> >>  I am a kernel newbie.
> >>  I tried to insmod a C++ module containing classes, inheritance.
> >>  I am getting 'unresolved symbol' error when I use the 'new' keyword.
> >>  What could the problem be?
> >>
> >>  What kind of runtime support is needed ( arm linux kernel)? Is a
> >> patch available for it?
> >>
> >Please take a look at click modular router which is using c++ as a
> >linux kernel module.
> >http://www.read.cs.ucla.edu/click/
> >The lib/glue.cc provides custom operator new.
>
> Uh, let's not make the world worse :)
> Just call malloc from C++, and carefully select what C++ features
> you are going to use. The VMware source for example does it right.
>

Yep, also I think that if kmalloc is possible it would better than the
operator new.

Rohit,
Compiling the kernel module with g++ is not a simple work, you may
need big patch for kernel itself.
The c++ has more internal keywords than c.
e.g) new, delete, and ::
The new and delete should be re-spelled with another names.
The '::' is used in inline assembly however in c++ it means global namespace.

In conclusion, I don't recommand c++ for linux kernel without very
special goal like the click project :)

Joonwoo
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