linux-kernel - Re: [PATCH -mm] replace DECLARE_DMA_UNMAP_ADD_{ADDR,LEN} with DEFINE_DMA_UNMAP_ADD

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Date:	Wed, 03 Mar 2010 15:16:05 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] replace DECLARE_DMA_UNMAP_ADD_{ADDR,LEN} with DEFINE_DMA_UNMAP_ADD_{ADDR,LEN}

On 03/02/10 20:50, FUJITA Tomonori wrote:
> Seems that you missed the following patch?
> 
> http://lkml.org/lkml/2010/2/13/2
> 
> This can be fold into dma-mappingh-add-the-dma_unmap-state-api.patch.
> 
> Thanks,
> 
> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH -mm] replace DECLARE_DMA_UNMAP_ADD_{ADDR,LEN} with DEFINE_DMA_UNMAP_ADD_{ADDR,LEN}
> 
> Andrew pointed out:
> 
> - adding the semicolons at the end of DECLARE_DMA_UNMAP_{ADDR|LEN}
>   confuses people.

Hm.  I'm (still) confused.  Why does this patch add semi-colons at the end
of DECLARE_PCI_UNMAP_{ADDR|LEN} below then?  (other than it is spelled with
letters "PCI" instead of "DMA")

Thanks.


> - they are "definitions", not "declarations".
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  Documentation/DMA-API.txt   |    8 +++-----
>  include/linux/dma-mapping.h |    8 ++++----
>  include/linux/pci-dma.h     |   12 ++++++------
>  3 files changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
> index d7d9eef..0fc5728 100644
> --- a/Documentation/DMA-API.txt
> +++ b/Documentation/DMA-API.txt
> @@ -494,7 +494,7 @@ portable API) the following facilities are provided.
>  Actually, instead of describing the macros one by one, we'll
>  transform some example code.
>  
> -1) Use DECLARE_DMA_UNMAP_{ADDR,LEN} in state saving structures.
> +1) Use DEFINE_DMA_UNMAP_{ADDR,LEN} in state saving structures.
>     Example, before:
>  
>  	struct ring_state {
> @@ -507,12 +507,10 @@ transform some example code.
>  
>  	struct ring_state {
>  		struct sk_buff *skb;
> -		DECLARE_DMA_UNMAP_ADDR(mapping)
> -		DECLARE_DMA_UNMAP_LEN(len)
> +		DEFINE_DMA_UNMAP_ADDR(mapping);
> +		DEFINE_DMA_UNMAP_LEN(len);
>  	};
>  
> -NOTE: DO NOT put a semicolon at the end of the DECLARE_*() macro.
> -
>  2) Use dma_unmap_{addr,len}_set to set these values.
>     Example, before:
>  
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 599d8e4..e00c5c9 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -241,15 +241,15 @@ struct dma_attrs;
>  #endif /* CONFIG_HAVE_DMA_ATTRS */
>  
>  #ifdef CONFIG_NEED_DMA_MAP_STATE
> -#define DECLARE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME;
> -#define DECLARE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME;
> +#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
> +#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
>  #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
>  #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
>  #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
>  #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
>  #else
> -#define DECLARE_DMA_MAP_ADDR(ADDR_NAME)
> -#define DECLARE_DMA_UNMAP_LEN(LEN_NAME)
> +#define DEFINE_DMA_MAP_ADDR(ADDR_NAME)
> +#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
>  #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
>  #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
>  #define dma_unmap_len(PTR, LEN_NAME)             (0)
> diff --git a/include/linux/pci-dma.h b/include/linux/pci-dma.h
> index 235a61e..549a041 100644
> --- a/include/linux/pci-dma.h
> +++ b/include/linux/pci-dma.h
> @@ -1,11 +1,11 @@
>  #ifndef _LINUX_PCI_DMA_H
>  #define _LINUX_PCI_DMA_H
>  
> -#define DECLARE_PCI_UNMAP_ADDR    DECLARE_DMA_UNMAP_ADDR
> -#define DECLARE_PCI_UNMAP_LEN     DECLARE_DMA_UNMAP_LEN
> -#define pci_unmap_addr            dma_unmap_addr
> -#define pci_unmap_addr_set        dma_unmap_addr_set
> -#define pci_unmap_len             dma_unmap_len
> -#define pci_unmap_len_set         dma_unmap_len_set
> +#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) DEFINE_DMA_UNMAP_ADDR(ADDR_NAME);
> +#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)   DEFINE_DMA_UNMAP_LEN(LEN_NAME);
> +#define pci_unmap_addr             dma_unmap_addr
> +#define pci_unmap_addr_set         dma_unmap_addr_set
> +#define pci_unmap_len              dma_unmap_len
> +#define pci_unmap_len_set          dma_unmap_len_set
>  
>  #endif


-- 
~Randy
--
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