netdev - Re: [5.16.0-rc7] net-next build broken on powerpc

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Date:   Mon, 3 Jan 2022 19:33:46 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
Cc:     netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, saeedm@...dia.com,
        sachinp <sachinp@...ux.vnet.ibm.com>
Subject: Re: [5.16.0-rc7] net-next build broken on powerpc

On Mon, 3 Jan 2022 19:10:01 +0530 Abdul Haleem wrote:
> Greeting's
> 
> Today's netdev/net-next kernel 5.16.0-rc7 failed to build on my powerpc box with below error
> 
>    CC [M]  drivers/net/ethernet/mellanox/mlx5/core/en_main.o
> In file included from ./arch/powerpc/include/generated/asm/rwonce.h:1,
>                   from ./include/linux/compiler.h:266,
>                   from ./arch/powerpc/include/asm/cmpxchg.h:6,
>                   from ./arch/powerpc/include/asm/atomic.h:11,
>                   from ./include/linux/atomic.h:7,
>                   from ./include/linux/refcount.h:95,
>                   from ./include/net/act_api.h:9,
>                   from ./include/net/tc_act/tc_gact.h:5,
>                   from drivers/net/ethernet/mellanox/mlx5/core/en_main.c:33:
> drivers/net/ethernet/mellanox/mlx5/core/en_main.c: In function ‘mlx5e_alloc_rq’:
> ./include/linux/rcupdate.h:412:36: error: dereferencing pointer to incomplete type ‘struct bpf_prog’
>   #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
>                                      ^~~~
> ./include/asm-generic/rwonce.h:55:33: note: in definition of macro ‘__WRITE_ONCE’
>    *(volatile typeof(x) *)&(x) = (val);    \
>                                   ^~~
> ./include/linux/rcupdate.h:854:3: note: in expansion of macro ‘WRITE_ONCE’
>     WRITE_ONCE(p, RCU_INITIALIZER(v)); \
>     ^~~~~~~~~~
> ./include/linux/rcupdate.h:854:17: note: in expansion of macro ‘RCU_INITIALIZER’
>     WRITE_ONCE(p, RCU_INITIALIZER(v)); \
>                   ^~~~~~~~~~~~~~~
> drivers/net/ethernet/mellanox/mlx5/core/en_main.c:569:2: note: in expansion of macro ‘RCU_INIT_POINTER’
>    RCU_INIT_POINTER(rq->xdp_prog, params->xdp_prog);
>    ^~~~~~~~~~~~~~~~
> make[5]: *** [scripts/Makefile.build:287: drivers/net/ethernet/mellanox/mlx5/core/en_main.o] Error 1
> 

I can repro a powerpc build failure with ice, but I don't see anything
wrong in mlx5 in an allmodconfig. The config you attached is invalid:

.config:709:warning: symbol value 'm' invalid for HOTPLUG_PCI_SHPC
.config:892:warning: symbol value 'm' invalid for NF_CT_PROTO_GRE
.config:919:warning: symbol value 'm' invalid for NF_NAT_REDIRECT
.config:922:warning: symbol value 'm' invalid for NF_TABLES_INET
.config:1099:warning: symbol value 'm' invalid for NF_TABLES_IPV4
.config:1104:warning: symbol value 'm' invalid for NF_TABLES_ARP
.config:1146:warning: symbol value 'm' invalid for NF_TABLES_IPV6
.config:1537:warning: symbol value 'm' invalid for NET_DEVLINK
.config:2721:warning: symbol value 'm' invalid for ISDN_CAPI
.config:3066:warning: symbol value 'm' invalid for HW_RANDOM_TPM
.config:3589:warning: symbol value 'm' invalid for LIRC
.config:5356:warning: symbol value 'm' invalid for FS_ENCRYPTION

I'll send a fix based on your error messages, it does look like
en_main.c should include filter.h.