linux-kernel - Re: [PATCH] scsi: libsas depends on HAS

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Date:	Mon, 11 May 2009 22:50:33 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] scsi: libsas depends on HAS_DMA

On Mon, 2009-05-11 at 22:40 +0000, Arnd Bergmann wrote:
> libsas uses the DMA mapping API, so it cannot be
> built on architectures that don't support DMA.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/scsi/libsas/Kconfig |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/libsas/Kconfig b/drivers/scsi/libsas/Kconfig
> index 18f33cd..59e00fa 100644
> --- a/drivers/scsi/libsas/Kconfig
> +++ b/drivers/scsi/libsas/Kconfig
> @@ -24,7 +24,7 @@
>  
>  config SCSI_SAS_LIBSAS
>  	tristate "SAS Domain Transport Attributes"
> -	depends on SCSI
> +	depends on SCSI && HAS_DMA

Our unfortunate Kconfig system can cause problems if you do this:
SCSI_SAS_LIBSAS is used as a select for drivers that need it, so either
they'd need to select this themselves, or you need some other solution.

James


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