linux-kernel - Re: [PATCH 01/16] dma-debug: add Kconfig entry

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Message-Id: <20090109121225.a0b4bbee.randy.dunlap@oracle.com>
Date:	Fri, 9 Jan 2009 12:12:25 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	dwmw2@...radead.org, fujita.tomonori@....ntt.co.jp,
	netdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 01/16] dma-debug: add Kconfig entry

On Fri, 9 Jan 2009 17:19:15 +0100 Joerg Roedel wrote:

> Impact: add a Kconfig entry for DMA-API debugging

Surely Impact: is (meant to be) different from the actual patch description... ?


> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/Kconfig      |    2 ++
>  lib/Kconfig.debug |   11 +++++++++++
>  2 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 2e13aa2..068554c 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -103,3 +103,5 @@ config HAVE_CLK
>  	  The <linux/clk.h> calls support software clock gating and
>  	  thus are a key power management tool on many systems.
>  
> +config HAVE_DMA_API_DEBUG
> +	bool
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 2e75478..cba5778 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -899,6 +899,17 @@ config DYNAMIC_PRINTK_DEBUG
>  	  debugging for all modules. This mode can be turned off via the above
>  	  disable command.
>  
> +config DMA_API_DEBUG
> +	bool "Enable debugging of DMA-API usage"
> +	depends on HAVE_DMA_API_DEBUG
> +	help
> +	  Enable this option to debug the use of the DMA API by device drivers.
> +	  With this option you will be able to detect common bugs in device
> +	  drivers like double-freeing of DMA mappings or freeing mappings that
> +	  were never allocated.
> +	  This option causes a performance degredation.  Use only if you want
> +	  to debug device drivers. If unsure, say N.
> +
>  source "samples/Kconfig"
>  
>  source "lib/Kconfig.kgdb"
> -- 

---
~Randy
--
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