linux-kernel - Re: [PATCH] scsi: ufs: select CONFIG

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Date:	Tue, 22 Mar 2016 07:43:19 -0400
From:	James Bottomley <jejb@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	Yaniv Gardi <ygardi@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Hannes Reinecke <hare@...e.de>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: ufs: select CONFIG_NLS

On Thu, 2016-03-17 at 13:29 +0100, Arnd Bergmann wrote:
> A recent change to ufshcd introduced a call to utf16s_to_utf8s,
> a function that is provided by the NLS module, so we get a link
> error when that is not present:
> 
> drivers/scsi/built-in.o: In function `ufshcd_read_string_desc':
> :(.text+0x124d0): undefined reference to `utf16s_to_utf8s'
> 
> This adds a Kconfig 'select' statement to avoid the build error.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: b573d484e4ff ("scsi: ufs: add support to read device and
> string descriptors")
> ---
>  drivers/scsi/ufs/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index 5f4530744e0a..097894a1fab5 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -37,6 +37,7 @@ config SCSI_UFSHCD
>  	depends on SCSI && SCSI_DMA
>  	select PM_DEVFREQ
>  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
> +	select NLS

This looks like a bad solution: CONFIG_NLS is nothing more than a menu
selector for the NLS subsystem.  The problem is that selecting it will
allow a kernel to be build with NLS and without NLS_DEFAULT which is
going to cause all sorts of interesting problems on boot.  I think you
really mean depends on NLS here.

James