[PATCH v1] um: fix incompatible argument type in iounmap()

[Danilo Krummrich]

On Wed, Apr 09, 2025 at 07:07:56PM +0200, Geert Uytterhoeven wrote:
> Hi Miguel,
> 
> CC arnd
> 
> On Wed, 9 Apr 2025 at 16:48, Miguel Ojeda
> <miguel.ojeda.sandonis at gmail.com> wrote:
> > On Wed, Apr 9, 2025 at 8:16 AM FUJITA Tomonori
> > <fujita.tomonori at gmail.com> wrote:
> > >
> > > Align iounmap() signature with other architectures.
> >
> > Most indeed have `volatile`, but nios2 and m68k don't -- Cc'ing them
> > just in case.
> 
> Indeed. Apparently the volatile keyword has not always been there...
> Why does iounmap() need the volatile keyword?
> Why does pci_iounmap() not have the volatile keyword?

I think none of the functions within rust/helpers/io.c need volatile, since they
just defer to the corresponding C function / macro.

This probably has been a copy/paste mistake of the function signatures and
should be removed instead.

- Danilo