linux-kernel - Re: [PATCH V2] MIPS: bugfix of coherentio variable default setup

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Date:	Thu, 11 Sep 2014 13:56:08 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>,
	<linux-mips@...ux-mips.org>, <nbd@...nwrt.org>,
	<jchandra@...adcom.com>, <paul.burton@...tec.com>,
	<david.daney@...ium.com>, <linux-kernel@...r.kernel.org>,
	<ralf@...ux-mips.org>, <markos.chandras@...tec.com>,
	<macro@...ux-mips.org>, <manuel.lauss@...il.com>,
	<jerinjacobk@...il.com>, <chenhc@...ote.com>, <blogic@...nwrt.org>
Subject: Re: [PATCH V2] MIPS: bugfix of coherentio variable default setup

On 08/09/14 20:10, Leonid Yegoshin wrote:
> diff --git a/arch/mips/include/asm/mach-generic/dma-coherence.h b/arch/mips/include/asm/mach-generic/dma-coherence.h
> index 7629c35..b4563df 100644
> --- a/arch/mips/include/asm/mach-generic/dma-coherence.h
> +++ b/arch/mips/include/asm/mach-generic/dma-coherence.h
> @@ -49,7 +49,12 @@ static inline int plat_dma_supported(struct device *dev, u64 mask)
>  
>  static inline int plat_device_is_coherent(struct device *dev)
>  {
> -	return coherentio;
> +#ifdef CONFIG_DMA_COHERENT
> +	return 1;

if DMA_COHERENT=y (which seems to imply DMA_MAYBE_COHERENT=n),
coherentio is already defined as 1 in
arch/mips/include/asm/dma-coherent.h, so I don't think you need this case.

> +#else
> +	return (coherentio > 0);
> +#endif
> +

No need for a new blank line here

>  }

...

> diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
> index 44b6dff..42c819a 100644
> --- a/arch/mips/mm/dma-default.c
> +++ b/arch/mips/mm/dma-default.c
> @@ -24,7 +24,7 @@
>  #include <dma-coherence.h>
>  
>  #ifdef CONFIG_DMA_MAYBE_COHERENT
> -int coherentio = 0;	/* User defined DMA coherency from command line. */
> +int coherentio = -1;    /* User defined DMA coherency is not defined yet. */

Please avoid unnecessarily turned tabs into spaces. It makes files
inconsistent.

Other than that and Markos' style comment it looks reasonable to me.

Cheers
James
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