linux-kernel - Re: linux-next: build failure after merge of the battery tree

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Date:	Sat, 07 Jan 2012 20:00:37 +1100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Anton Vorontsov <cbouatmailru@...il.com>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the battery tree

On 01/06/2012 02:25 AM, Anton Vorontsov wrote:
> On Thu, Jan 05, 2012 at 02:40:42PM +1100, Stephen Rothwell wrote:
>> Hi Anton,
>>
>> After merging the battery tree, today's linux-next build (x86_64
>> allmodconfig) failed like this:
>>
>> ERROR: "sysfs_create_link_nowarn" [drivers/power/power_supply.ko] undefined!
>>
>> Caused by commit 8351665195ce ("power_supply: allow a power supply to
>> explicitly point to powered device").  That symbol is not exported to
>> modules.
>>
>> I have used the battery tree from next-20120104 for today.
> Thanks for catching this, Stephen!
>
> I wonder why do we need to use _nowarn variant?..
>
> Something tells me that we actually want a warning.
>
> Jeremy, are you OK with the patch down below?

Yep, that's fine.

    J

>
> - - - -
> From: Anton Vorontsov <cbouatmailru@...il.com>
> Subject: power_supply: Drop usage of nowarn variant of sysfs_create_link()
>
> The function is not exported to modules, plus we do want to catch anyone
> who tries to create complex hierarchy (in that case we'd need to change
> 'powers' symlink to a directory, probably under a different name to not
> break ABI).
>
> This patch fixes the following build error:
>
>  ERROR: "sysfs_create_link_nowarn" [drivers/power/power_supply.ko] undefined!
>
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Anton Vorontsov <cbouatmailru@...il.com>
> ---
>  drivers/power/power_supply_core.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
> index b10c121..47f4e11 100644
> --- a/drivers/power/power_supply_core.c
> +++ b/drivers/power/power_supply_core.c
> @@ -149,7 +149,7 @@ EXPORT_SYMBOL_GPL(power_supply_get_by_name);
>  
>  int power_supply_powers(struct power_supply *psy, struct device *dev)
>  {
> -	return sysfs_create_link_nowarn(&psy->dev->kobj, &dev->kobj, "powers");
> +	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
>  }
>  EXPORT_SYMBOL_GPL(power_supply_powers);
>  

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