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

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Date:   Thu, 1 Oct 2020 08:09:16 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>
Cc:     Vadym Kochan <vadym.kochan@...ision.eu>,
        Taehee Yoo <ap420073@...il.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the net-next tree

Hi all,

On Tue, 29 Sep 2020 13:04:46 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> After merging the net-next tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> drivers/net/ethernet/marvell/prestera/prestera_main.c: In function 'prestera_port_dev_lower_find':
> drivers/net/ethernet/marvell/prestera/prestera_main.c:504:33: error: passing argument 2 of 'netdev_walk_all_lower_dev' from incompatible pointer type [-Werror=incompatible-pointer-types]
>   504 |  netdev_walk_all_lower_dev(dev, prestera_lower_dev_walk, &port);
>       |                                 ^~~~~~~~~~~~~~~~~~~~~~~
>       |                                 |
>       |                                 int (*)(struct net_device *, void *)
> In file included from include/linux/etherdevice.h:21,
>                  from drivers/net/ethernet/marvell/prestera/prestera_main.c:4:
> include/linux/netdevice.h:4571:16: note: expected 'int (*)(struct net_device *, struct netdev_nested_priv *)' but argument is of type 'int (*)(struct net_device *, void *)'
>  4571 |          int (*fn)(struct net_device *lower_dev,
>       |          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  4572 |      struct netdev_nested_priv *priv),
>       |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/marvell/prestera/prestera_main.c:504:58: error: passing argument 3 of 'netdev_walk_all_lower_dev' from incompatible pointer type [-Werror=incompatible-pointer-types]
>   504 |  netdev_walk_all_lower_dev(dev, prestera_lower_dev_walk, &port);
>       |                                                          ^~~~~
>       |                                                          |
>       |                                                          struct prestera_port **
> In file included from include/linux/etherdevice.h:21,
>                  from drivers/net/ethernet/marvell/prestera/prestera_main.c:4:
> include/linux/netdevice.h:4573:37: note: expected 'struct netdev_nested_priv *' but argument is of type 'struct prestera_port **'
>  4573 |          struct netdev_nested_priv *priv);
>       |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
> cc1: some warnings being treated as errors
> 
> Caused by commit
> 
>   eff7423365a6 ("net: core: introduce struct netdev_nested_priv for nested interface infrastructure")
> 
> interacting with commit
> 
>   e1189d9a5fbe ("net: marvell: prestera: Add Switchdev driver implementation")
> 
> also in the net-next tree.
> 
> I applied the following fix patch.
> 
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Tue, 29 Sep 2020 12:57:59 +1000
> Subject: [PATCH] fix up for "net: core: introduce struct netdev_nested_priv for nested interface infrastructure"
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  drivers/net/ethernet/marvell/prestera/prestera_main.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> index 9bd57b89d1d0..633d8770be35 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> @@ -482,9 +482,10 @@ bool prestera_netdev_check(const struct net_device *dev)
>  	return dev->netdev_ops == &prestera_netdev_ops;
>  }
>  
> -static int prestera_lower_dev_walk(struct net_device *dev, void *data)
> +static int prestera_lower_dev_walk(struct net_device *dev,
> +				   struct netdev_nested_priv *priv)
>  {
> -	struct prestera_port **pport = data;
> +	struct prestera_port **pport = (struct prestera_port **)priv->data;
>  
>  	if (prestera_netdev_check(dev)) {
>  		*pport = netdev_priv(dev);
> @@ -497,11 +498,13 @@ static int prestera_lower_dev_walk(struct net_device *dev, void *data)
>  struct prestera_port *prestera_port_dev_lower_find(struct net_device *dev)
>  {
>  	struct prestera_port *port = NULL;
> +	struct netdev_nested_priv priv;
>  
>  	if (prestera_netdev_check(dev))
>  		return netdev_priv(dev);
>  
> -	netdev_walk_all_lower_dev(dev, prestera_lower_dev_walk, &port);
> +	priv.data = (void *)&port;
> +	netdev_walk_all_lower_dev(dev, prestera_lower_dev_walk, &priv);
>  
>  	return port;
>  }

I am still getting this build failure ...

-- 
Cheers,
Stephen Rothwell

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