Re: [RESEND PATCH v2 6/9] drm/mgag200: Constify ioreadX() iomem argument (as in generic implementation)

Thomas Zimmermann
2020-03-12T10:49:20Z

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Hi Krzysztof,

I just received a resend email from 3 weeks ago :/

Do you want me to merge the mgag200 patch into drm-misc-next?

Best regards
Thomas

Am 19.02.20 um 18:50 schrieb Krzysztof Kozlowski:
> 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>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
>
> ---
>
> Changes since v1:
> 1. Add Thomas' review.
> ---
> drivers/gpu/drm/mgag200/mgag200_drv.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
> index aa32aad222c2..6512b3af4fb7 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.h
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
> @@ -34,9 +34,9 @@
>
> #define MGAG200FB_CONN_LIMIT 1
>
> -#define RREG8(reg) ioread8(((void __iomem *)mdev->rmmio) + (reg))
> +#define RREG8(reg) ioread8(((const void __iomem *)mdev->rmmio) + (reg))
> #define WREG8(reg, v) iowrite8(v, ((void __iomem *)mdev->rmmio) + (reg))
> -#define RREG32(reg) ioread32(((void __iomem *)mdev->rmmio) + (reg))
> +#define RREG32(reg) ioread32(((const void __iomem *)mdev->rmmio) + (reg))
> #define WREG32(reg, v) iowrite32(v, ((void __iomem *)mdev->rmmio) + (reg))
>
> #define ATTR_INDEX 0x1fc0
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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