[PATCH v4 11/18] asm-generic/io.h: implement pci_remap_cfgspace using ioremap_np

[Andy Shevchenko]

On Thu, Apr 8, 2021 at 2:01 PM Hector Martin <marcan at marcan.st> wrote:
> On 08/04/2021 06.03, Will Deacon wrote:
> >> I would rewrite above as
> >>
> >> void __iomem *ret;
> >>
> >> ret = ioremap_np(offset, size);
> >> if (ret)
> >>    return ret;
> >>
> >> return ioremap(offset, size);
> >
> > Looks like it might be one of those rare occasions where the GCC ternary if
> > extension thingy comes in handy:
> >
> >       return ioremap_np(offset, size) ?: ioremap(offset, size);
>
> Today I learned that this one is kosher in kernel code. Handy! Let's go
> with that.

It depends on the maintainer. Greg, for example, doesn't  like this. I
have no strong opinion (I use both variants on case-by-case basis),
though I think in headers better to spell out all conditionals
clearly.

-- 
With Best Regards,
Andy Shevchenko