linux-kernel - Re: [PATCH drm-misc-next v5 3/4] drm/gem: rename struct drm_gem_dma_object.{paddr => dma

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Date:   Wed, 20 Jul 2022 19:28:51 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     daniel@...ll.ch, laurent.pinchart@...asonboard.com,
        airlied@...ux.ie, tzimmermann@...e.de, mripard@...nel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH drm-misc-next v5 3/4] drm/gem: rename struct
 drm_gem_dma_object.{paddr => dma_addr}

On Wed, Jul 20, 2022 at 05:35:31PM +0200, Danilo Krummrich wrote:
> The field paddr of struct drm_gem_dma_object holds a DMA address, which
> might actually be a physical address. However, depending on the platform,
> it can also be a bus address or a virtual address managed by an IOMMU.
> 
> Hence, rename the field to dma_addr, which is more applicable.
> 
> In order to do this renaming the following coccinelle script was used:
> 
> ```
> 	@@
> 	struct drm_gem_dma_object *gem;
> 	@@
> 
> 	- gem->paddr
> 	+ gem->dma_addr
> 
> 	@@
> 	struct drm_gem_dma_object gem;
> 	@@
> 
> 	- gem.paddr
> 	+ gem.dma_addr
> 
> 	@exists@
> 	typedef dma_addr_t;
> 	symbol paddr;
> 	@@
> 
> 	dma_addr_t paddr;
> 	<...
> 	- paddr
> 	+ dma_addr
> 	...>
> 
> 	@@
> 	symbol paddr;
> 	@@
> 	dma_addr_t
> 	- paddr
> 	+ dma_addr
> 	;
> 
> ```
> 
> This patch is compile-time tested with:
> 
> ```
> 	make ARCH={x86_64,arm,arm64} allyesconfig
> 	make ARCH={x86_64,arm,arm64} drivers/gpu/drm`
> ```
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
Acked-by: Sam Ravnborg <sam@...nborg.org>