linux-kernel - Re: [PATCH 1/2] cdx: Enable COMPILE

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Date: Thu, 21 Dec 2023 09:46:51 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: "Gangurde, Abhijit" <abhijit.gangurde@....com>
Cc: "Gupta, Nipun" <Nipun.Gupta@....com>,
	"Agarwal, Nikhil" <nikhil.agarwal@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 1/2] cdx: Enable COMPILE_TEST

On Thu, Dec 21, 2023 at 08:40:05AM +0000, Gangurde, Abhijit wrote:
> > > > > On Thu, Dec 07, 2023 at 10:31:26AM -0600, Rob Herring wrote:
> > > > > > There is no reason CDX needs to depend on ARM64 other than limiting
> > > > > > visibility. So let's also enable building with COMPILE_TEST.
> > > > > >
> > > > > > The CONFIG_OF dependency is redundant as ARM64 always enables it
> > and
> > > > all
> > > > > > the DT functions have empty stubs.
> > > > > >
> > > > > > Signed-off-by: Rob Herring <robh@...nel.org>
> > > > > > ---
> > > > > >  drivers/cdx/Kconfig | 2 +-
> > > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > >
> > > > > > diff --git a/drivers/cdx/Kconfig b/drivers/cdx/Kconfig
> > > > > > index a08958485e31..7cdb7c414453 100644
> > > > > > --- a/drivers/cdx/Kconfig
> > > > > > +++ b/drivers/cdx/Kconfig
> > > > > > @@ -7,7 +7,7 @@
> > > > > >
> > > > > >  config CDX_BUS
> > > > > >  	bool "CDX Bus driver"
> > > > > > -	depends on OF && ARM64
> > > > > > +	depends on ARM64 || COMPILE_TEST
> > > > >
> > > > > Ok, good start, now we need to turn this into a module, what's keeping
> > > > > it from being able to be built as a tristate?
> > > >
> > > > To answer my own question, the following errors:
> > > >
> > > > ERROR: modpost: missing MODULE_LICENSE() in drivers/cdx/cdx.o
> > > > ERROR: modpost: "iommu_device_unuse_default_domain"
> > > > [drivers/cdx/cdx.ko] undefined!
> > > > ERROR: modpost: "iommu_device_use_default_domain"
> > [drivers/cdx/cdx.ko]
> > > > undefined!
> > > >
> > > > Would be great for someone to fix this up...
> > >
> > > I did look at this code. There are 2 issues here for it to be a module.
> > > 1. There are many symbols in iommu, msi and other module which are not
> > exported.
> > > Most of other busses like amba, fslmc, pci are bool only.
> > 
> > I only see 2 symbols here, what other ones do you see?
> 
> There are ~5 symbols from cdx msi patch

That hasn't been merged yet :)