netdev - Re: [PATCH] net: ethernet: rocker: Add select to CONFIG

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Date:	Fri, 5 Dec 2014 09:32:51 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Andreas Ruprecht <mail@...ran.de>
Cc:	David Miller <davem@...emloft.net>, jim.epost@...il.com,
	sfr@...b.auug.org.au, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, sfeldma@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: rocker: Add select to CONFIG_BRIDGE in
 Kconfig

Fri, Dec 05, 2014 at 09:28:03AM CET, mail@...ran.de wrote:
>
>> On 05.12.2014 05:24, David Miller wrote:
>> Do not use select, please.
>> 
>> You can only use select on leaf node Kconfig symbols, ie. those
>> which do not have any dependencies whatsoever.
>> 
>> Select does not recursively walk down the dependency chain turning
>> things on for you when you say "select X".
>> 
>
>Okay, sure, my bad for not looking that up properly.
>
>If we change this into a "depends on", this should not be a problem,
>right? If CONFIG_BRIDGE is selected as 'm', then CONFIG_ROCKER can only
>be 'n' or 'm', if CONFIG_BRIDGE is set to 'y', it can be 'n', 'm' or 'y'.
>
>This also means that the prompt associated with CONFIG_ROCKER will only
>show up in menuconfig when CONFIG_BRIDGE has been enabled (either 'm' or
>'y').
>
>I've attached an updated patch.

>>From 931a36cc5ec67ec23ba2373d42840d968ed78120 Mon Sep 17 00:00:00 2001
>From: Andreas Ruprecht <rupran@...server.de>
>Date: Thu, 4 Dec 2014 18:28:09 +0100
>Subject: [PATCH] net: ethernet: rocker: Add dependency to CONFIG_BRIDGE in
> Kconfig
>
>In a configuration with CONFIG_BRIDGE set to 'm' and CONFIG_ROCKER
>set to 'y', undefined references occur at link time:
>
>> drivers/built-in.o: In function `rocker_port_fdb_learn_work':
>> /home/jim/linux/drivers/net/ethernet/rocker/rocker.c:3014: undefined
>> reference to `br_fdb_external_learn_del'
>> /home/jim/linux/drivers/net/ethernet/rocker/rocker.c:3016: undefined
>> reference to `br_fdb_external_learn_add'
>
>This patch fixes these by declaring CONFIG_ROCKER as being dependent
>on CONFIG_BRIDGE.
>
>Reported-by: Jim Davis <jim.epost@...il.com>
>Signed-off-by: Andreas Ruprecht <rupran@...server.de>

Acked-by: Jiri Pirko <jiri@...nulli.us>


>---
> drivers/net/ethernet/rocker/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/net/ethernet/rocker/Kconfig b/drivers/net/ethernet/rocker/Kconfig
>index 11a850eab628..b9952ef040e4 100644
>--- a/drivers/net/ethernet/rocker/Kconfig
>+++ b/drivers/net/ethernet/rocker/Kconfig
>@@ -17,7 +17,7 @@ if NET_VENDOR_ROCKER
>
> config ROCKER
> 	tristate "Rocker switch driver (EXPERIMENTAL)"
>-	depends on PCI && NET_SWITCHDEV
>+	depends on PCI && NET_SWITCHDEV && BRIDGE
> 	---help---
> 	  This driver supports Rocker switch device.
>
>--
>1.9.1
>

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