Re: [RFT 02/13] alpha: Constify ioreadX() iomem argument (as in generic implementation)

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Krzysztof,

On Tue, Jan 7, 2020 at 5:53 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> The ioreadX() helpers have inconsistent interface.  On some architectures
> void *__iomem address argument is a pointer to const, on some not.
>
> Implementations of ioreadX() do not modify the memory under the address
> so they can be converted to a "const" version for const-safety and
> consistency among architectures.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

> --- a/arch/alpha/include/asm/io.h
> +++ b/arch/alpha/include/asm/io.h
> @@ -151,9 +151,9 @@ static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr)  \
>         alpha_mv.mv_##NAME(b, addr);                                    \
>  }
>
> -REMAP1(unsigned int, ioread8, /**/)
> -REMAP1(unsigned int, ioread16, /**/)
> -REMAP1(unsigned int, ioread32, /**/)
> +REMAP1(unsigned int, ioread8, const)
> +REMAP1(unsigned int, ioread16, const)
> +REMAP1(unsigned int, ioread32, const)

If these would become "const volatile", there would no longer be a need
for the last parameter of the REMAP1() macro.

>  REMAP1(u8, readb, const volatile)
>  REMAP1(u16, readw, const volatile)
>  REMAP1(u32, readl, const volatile)

Same for REMAP2() macro below, for iowrite*().

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds