Re: [PATCH v3 2/3] openrisc: Add pci bus support

From: Stafford Horne
Date: Fri Jul 29 2022 - 01:51:00 EST


On Thu, Jul 28, 2022 at 08:37:28PM -0700, Guenter Roeck wrote:
> On Mon, Jul 25, 2022 at 11:07:36AM +0900, Stafford Horne wrote:
> > This patch adds required definitions to allow for PCI buses on OpenRISC.
> > This is being tested on the OpenRISC QEMU virt platform which is in
> > development.
> >
> > OpenRISC does not have IO ports so we keep the definition of
> > IO_SPACE_LIMIT and PIO_RESERVED to be 0.
> >
> > Note, since commit 66bcd06099bb ("parport_pc: Also enable driver for PCI
> > systems") all platforms that support PCI also need to support parallel
> > port. We add a generic header to support compiling parallel port
> > drivers, though they generally will not work as they require IO ports.
> >
> > Signed-off-by: Stafford Horne <shorne@xxxxxxxxx>
>
> This patch results in
>
> Building openrisc:allmodconfig ... failed
> --------------
> Error log:
> drivers/video/fbdev/riva/fbdev.c: In function 'rivafb_probe':
> drivers/video/fbdev/riva/fbdev.c:2062:42: error:
> passing argument 1 of 'iounmap' discards 'volatile' qualifier from pointer target type
>
> drivers/video/fbdev/nvidia/nvidia.c: In function 'nvidiafb_probe':
> drivers/video/fbdev/nvidia/nvidia.c:1414:20: error:
> passing argument 1 of 'iounmap' discards 'volatile' qualifier from pointer target type
>
> drivers/scsi/aic7xxx/aic7xxx_osm.c: In function 'ahc_platform_free':
> drivers/scsi/aic7xxx/aic7xxx_osm.c:1231:41: error:
> passing argument 1 of 'iounmap' discards 'volatile' qualifier from pointer target type
>
> ... and so on.
>
> Prior to this patch, the code was not enabled because it depends on PCI.

Hi Guenter,

Thanks for reporting this.

It's interesting, I don't get this on the openrisc/for-next branch.

BTW, do you turn off WERROR on the allmodconfig config? I get many warnings
such as the below, but I haven't looked into it much yet:

fs/exec.c: In function 'shift_arg_pages':
fs/exec.c:687:27: error: 'tlb' is used uninitialized [-Werror=uninitialized]
687 | struct mmu_gather tlb;
| ^~~

I will try to see what is going on in linux-next.

-Stafford