Re: [PATCH v3 3/5] PCI: st: Provide support for the sti PCIe controller

[Arnd Bergmann]

On Saturday 11 April 2015 12:17:57 Paul Bolle wrote:
> Something I didn't spot in my first look at this patch.
> 
> On Fri, 2015-04-10 at 11:12 +0200, Gabriel FERNANDEZ wrote:
> > --- a/drivers/pci/host/Kconfig
> > +++ b/drivers/pci/host/Kconfig
> >  
> > +config PCI_ST
> > +     bool "ST PCIe controller"
> > +     depends on ARCH_STI || (ARM && COMPILE_TEST)
> > +     select PCIE_DW
> > +     help
> > +       Enable PCIe controller support on ST Socs. This controller is based
> > +       on Designware hardware and therefore the driver re-uses the
> > +       Designware core functions to implement the driver.
> 
> You can't have ARCH_STI without ARM, so ARM will always be set if this
> driver is enabled. Correct?

Right, though the ARM dependency could soon be dropped, once the PCIE_DW
driver can use generic infrastructure in the few places it relies on
ARM specific code today.

> > --- /dev/null
> > +++ b/drivers/pci/host/pci-st.c
> 
> > +     if (IS_ENABLED(CONFIG_ARM)) {
> > +             /*
> > +              * We have to hook the abort handler so that we can intercept
> > +              * bus errors when doing config read/write that return UR,
> > +              * which is flagged up as a bus error
> > +              */
> > +             hook_fault_code(16+6, st_pcie_abort_handler, SIGBUS, 0,
> > +                             "imprecise external abort");
> > +     }
> 
> So, unless I'm missing something obvious here, IS_ENABLED(CONFIG_ARM)
> will always evaluate to 1. Can't that test be dropped?

I would leave it in, as it's quite likely to get reused with ARM64 at some
point in the future (no, I don't know anything about ST's product plans,
but everybody seems to be doing this).

	Arnd
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