linux-kernel - Re: [PATCH] remove DMA_nBIT

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Date:	Thu, 07 May 2009 13:33:59 +0800
From:	Yang Hongyang <yanghy@...fujitsu.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] remove DMA_nBIT_MASK macro

FUJITA Tomonori wrote:
> We replaced all DMA_nBIT_MASK macros with DMA_BIT_MASK(n) but why do
> we still keep DMA_nBIT_MASK macros in include/linux/dma-mapping.h?
> 
> As long as these macros exist, people use them. The current git has
> two users and linux-next have other users.
> 
> Is it better to remove DMA_nBIT_MASK macros completely now?
> 

CC:ingo

I have no objections,actually I used to remove all these defines in my
first commit of these patch series,but got suggestions that keep these
defines one more circle.Maybe it's time to remove these defines now or
to remove at the end of this circle?

Reviewed-by:yanghy@...fujitsu.com

> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] remove DMA_nBIT_MASK macros
> 
> This removes DMA_nBIT_MASK macros in dma-mapping.h so that we will not
> have any new users.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  arch/arm/mach-davinci/board-dm644x-evm.c |    4 ++--
>  drivers/net/igbvf/netdev.c               |   13 +++++++------
>  include/linux/dma-mapping.h              |   19 -------------------
>  3 files changed, 9 insertions(+), 27 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/board-dm644x-evm.c b/arch/arm/mach-davinci/board-dm644x-evm.c
> index c039674..b2e7f9c 100644
> --- a/arch/arm/mach-davinci/board-dm644x-evm.c
> +++ b/arch/arm/mach-davinci/board-dm644x-evm.c
> @@ -211,7 +211,7 @@ static struct resource ide_resources[] = {
>  	},
>  };
>  
> -static u64 ide_dma_mask = DMA_32BIT_MASK;
> +static u64 ide_dma_mask = DMA_BIT_MASK(32);
>  
>  static struct platform_device ide_dev = {
>  	.name           = "palm_bk3710",
> @@ -220,7 +220,7 @@ static struct platform_device ide_dev = {
>  	.num_resources  = ARRAY_SIZE(ide_resources),
>  	.dev = {
>  		.dma_mask		= &ide_dma_mask,
> -		.coherent_dma_mask      = DMA_32BIT_MASK,
> +		.coherent_dma_mask      = DMA_BIT_MASK(32),
>  	},
>  };
>  
> diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
> index b774666..c084d3b 100644
> --- a/drivers/net/igbvf/netdev.c
> +++ b/drivers/net/igbvf/netdev.c
> @@ -1279,7 +1279,7 @@ static void igbvf_configure_tx(struct igbvf_adapter *adapter)
>  	/* Setup the HW Tx Head and Tail descriptor pointers */
>  	ew32(TDLEN(0), tx_ring->count * sizeof(union e1000_adv_tx_desc));
>  	tdba = tx_ring->dma;
> -	ew32(TDBAL(0), (tdba & DMA_32BIT_MASK));
> +	ew32(TDBAL(0), (tdba & DMA_BIT_MASK(32)));
>  	ew32(TDBAH(0), (tdba >> 32));
>  	ew32(TDH(0), 0);
>  	ew32(TDT(0), 0);
> @@ -1365,7 +1365,7 @@ static void igbvf_configure_rx(struct igbvf_adapter *adapter)
>  	 * the Base and Length of the Rx Descriptor Ring
>  	 */
>  	rdba = rx_ring->dma;
> -	ew32(RDBAL(0), (rdba & DMA_32BIT_MASK));
> +	ew32(RDBAL(0), (rdba & DMA_BIT_MASK(32)));
>  	ew32(RDBAH(0), (rdba >> 32));
>  	ew32(RDLEN(0), rx_ring->count * sizeof(union e1000_adv_rx_desc));
>  	rx_ring->head = E1000_RDH(0);
> @@ -2637,15 +2637,16 @@ static int __devinit igbvf_probe(struct pci_dev *pdev,
>  		return err;
>  
>  	pci_using_dac = 0;
> -	err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
> +	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
>  	if (!err) {
> -		err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
> +		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
>  		if (!err)
>  			pci_using_dac = 1;
>  	} else {
> -		err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
> +		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
>  		if (err) {
> -			err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
> +			err = pci_set_consistent_dma_mask(pdev,
> +							  DMA_BIT_MASK(32));
>  			if (err) {
>  				dev_err(&pdev->dev, "No usable DMA "
>  				        "configuration, aborting\n");
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 8083b6a..f56e607 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -63,25 +63,6 @@ struct dma_map_ops {
>  

Is it better to add a comment here to tell people that the old macro was deleted?

>  #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
>  
> -/*
> - * NOTE: do not use the below macros in new code and do not add new definitions
> - * here.
> - *
> - * Instead, just open-code DMA_BIT_MASK(n) within your driver
> - */
> -#define DMA_64BIT_MASK	DMA_BIT_MASK(64)
> -#define DMA_48BIT_MASK	DMA_BIT_MASK(48)
> -#define DMA_47BIT_MASK	DMA_BIT_MASK(47)
> -#define DMA_40BIT_MASK	DMA_BIT_MASK(40)
> -#define DMA_39BIT_MASK	DMA_BIT_MASK(39)
> -#define DMA_35BIT_MASK	DMA_BIT_MASK(35)
> -#define DMA_32BIT_MASK	DMA_BIT_MASK(32)
> -#define DMA_31BIT_MASK	DMA_BIT_MASK(31)
> -#define DMA_30BIT_MASK	DMA_BIT_MASK(30)
> -#define DMA_29BIT_MASK	DMA_BIT_MASK(29)
> -#define DMA_28BIT_MASK	DMA_BIT_MASK(28)
> -#define DMA_24BIT_MASK	DMA_BIT_MASK(24)
> -
>  #define DMA_MASK_NONE	0x0ULL
>  
>  static inline int valid_dma_direction(int dma_direction)


-- 
Regards
Yang Hongyang
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