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SubjectRe: 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@canb.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@canb.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@canb.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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