Where is the system call table in linux kernel v3.9?

[Srinivas Ganji]

Generally,

obj-y += foo.o

This tells kbuild that there is one object in that directory, named foo.o.
foo.o will be built from foo.c or foo.S.
If foo.o shall be built as a module, the variable obj-m is used.

obj-$(CONFIG_FOO) += foo.o

$(CONFIG_FOO) evaluates to either y (for built-in) or m (for module). If
CONFIG_FOO is neither y nor m, then the file will not be compiled nor
linked.

The #1 in your case, ifdef i.e. if the compilation flag (in your case
CONFIG_MY_SYSTEM_CALL) is defined then only the module is included into the
image.

I hope this helps you.

Regards,
Srinivas G.



On Wed, Jul 31, 2013 at 3:42 PM, Iker Pedrosa <ikerpedrosam at gmail.com>wrote:

> On Wed, 24 Jul 2013 17:19:13 +0530
> Srinivas Ganji <srinivasganji.kernel at gmail.com> wrote:
>
> > Hi Iker Pedrosa,
> >
> > Please look at how to write the Kconfig files. We need to write a new
> > Kconfig file for our own implementation.
> >
> > Regards,
> > Srinivas G.
> >
> >
>
> Hi again,
>
> I've just created the Kconfig and I have pend it from General setup, it's
> been a little bit difficult, mainly the part to pend it from General setup.
> Now, I've got some questions, which is the difference between the following
> statements?
> 1)
> ifdef CONFIG_MY_SYSTEM_CALL
> obj-y += my_system_calls.o
> endif
>
> 2)
> obj-(CONFIG_MY_SYSTEM_CALL)     += my_system_calls.o
>
> Where do I build the object in the object in the second option? Is it done
> in the same Makefile or in another one?
>
> Regards,
> --
> Iker Pedrosa <ikerpedrosam at gmail.com>
>
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