Date: Sun, 21 Oct 2007 12:24:02 +0200
From: Henrik Carlqvist <hc1@poolhem.se>
To: linux-kernel@vger.kernel.org
Subject: Re: tristate and bool not enogh for Kconfig anymore
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	<20071020191700.GB8774@uranus.ravnborg.org>
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On Sun, 21 Oct 2007 00:47:38 -0400
Valdis.Kletnieks@vt.edu wrote:

> On Sat, 20 Oct 2007 21:17:00 +0200, Sam Ravnborg said:
> > I assume
> > 	depends on MODULES
> > 
> > should do the trick.
> 
> Umm... I think that will work backwards, and give you CONFIG_FOO=y
> if.f the kernel *supports* modules. What he needs is to be able to say
> CONFIG_FOO=n or CONFIG_FOO=m, but *ban* CONFIG_FOO=y.

Yes, thats right, MODULES does not ban y as would be needed. As an example
I tried to do a quick test, I edited drivers/scsi/qla2xxx/Kconfig to look
like this:

-8<-------------------------------------------------------
config SCSI_QLA_FC
        tristate "QLogic QLA2XXX Fibre Channel Support"
        depends on PCI && SCSI && MODULES
        select SCSI_FC_ATTRS
        select FW_LOADER
        ---help---
        This qla2xxx driver supports all QLogic Fibre Channel
        PCI and PCIe host adapters.

        By default, firmware for the ISP parts will be loaded
        via the Firmware Loader interface.

        ISP               Firmware Filename
        ----------        -----------------
        21xx              ql2100_fw.bin
        22xx              ql2200_fw.bin
        2300, 2312, 6312  ql2300_fw.bin
        2322, 6322        ql2322_fw.bin
        24xx              ql2400_fw.bin

        Upon request, the driver caches the firmware image until
        the driver is unloaded.

        Firmware images can be retrieved from:

                ftp://ftp.qlogic.com/outgoing/linux/firmware/
-8<-------------------------------------------------------

The only thing that I did change was that I added "&& MODULES" to the
depends line. However, this only causes the driver to be possible to build
when you build a kernel with module support. Still tristate allows you to
build it both as a module and as a driver built into the kernel. However,
when built into the kernel the driver is unusable as it needs its firmware
which it can't reach. 

Is there any other way to specify that a functionality can only be built
as a module, not built into the kernel?

In my firsta attempts to post about these tests my post ended up not on
the mailing list but as a reply to Sam Ravnborg only, apologies for
that...

Best regards Henrik
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