[v2,6/9] drm/mgag200: Constify ioreadX() iomem argument (as in generic implementation)
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Message ID 20200108200528.4614-7-krzk@kernel.org
State New
Headers show
Series
  • iomap: Constify ioreadX() iomem argument
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Commit Message

Krzysztof Kozlowski Jan. 8, 2020, 8:05 p.m. UTC
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>
---
 drivers/gpu/drm/mgag200/mgag200_drv.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Thomas Zimmermann Jan. 9, 2020, 6:04 a.m. UTC | #1
Hi

Am 08.01.20 um 21:05 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>

> ---
>  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
>

Patch
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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