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Date:   Wed, 29 Nov 2017 12:13:44 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Xie XiuQi <xiexiuqi@...wei.com>
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        ast@...nel.org, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, john.fastabend@...il.com,
        linux-kernel@...r.kernel.org, huangdaode@...ilicon.com,
        Hanjun Guo <guohanjun@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] trace/xdp: fix compile warning: ‘struct bpf_map’ declared inside parameter list

On 11/29/2017 10:15 AM, Jesper Dangaard Brouer wrote:
> On Wed, 29 Nov 2017 16:35:01 +0800
> Xie XiuQi <xiexiuqi@...wei.com> wrote:
> 
>> We meet this compile warning, which caused by missing bpf.h in xdp.h.
>>
>> In file included from ./include/trace/events/xdp.h:10:0,
>>                  from ./include/linux/bpf_trace.h:6,
>>                  from drivers/net/ethernet/intel/i40e/i40e_txrx.c:29:
>> ./include/trace/events/xdp.h:93:17: warning: ‘struct bpf_map’ declared inside parameter list will not be visible outside of this definition or declaration
>>     const struct bpf_map *map, u32 map_index),
>>                  ^
>> ./include/linux/tracepoint.h:187:34: note: in definition of macro ‘__DECLARE_TRACE’
>>   static inline void trace_##name(proto)    \
>>                                   ^~~~~
>> ./include/linux/tracepoint.h:352:24: note: in expansion of macro ‘PARAMS’
>>   __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),  \
>>                         ^~~~~~
>> ./include/linux/tracepoint.h:477:2: note: in expansion of macro ‘DECLARE_TRACE’
>>   DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
>>   ^~~~~~~~~~~~~
>> ./include/linux/tracepoint.h:477:22: note: in expansion of macro ‘PARAMS’
>>   DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
>>                       ^~~~~~
>> ./include/trace/events/xdp.h:89:1: note: in expansion of macro ‘DEFINE_EVENT’
>>  DEFINE_EVENT(xdp_redirect_template, xdp_redirect,
>>  ^~~~~~~~~~~~
>> ./include/trace/events/xdp.h:90:2: note: in expansion of macro ‘TP_PROTO’
>>   TP_PROTO(const struct net_device *dev,
>>   ^~~~~~~~
>> ./include/trace/events/xdp.h:93:17: warning: ‘struct bpf_map’ declared inside parameter list will not be visible outside of this definition or declaration
>>     const struct bpf_map *map, u32 map_index),
>>                  ^
>> ./include/linux/tracepoint.h:203:38: note: in definition of macro ‘__DECLARE_TRACE’
>>   register_trace_##name(void (*probe)(data_proto), void *data) \
>>                                       ^~~~~~~~~~
>> ./include/linux/tracepoint.h:354:4: note: in expansion of macro ‘PARAMS’
>>     PARAMS(void *__data, proto),   \
>>     ^~~~~~
>>
>> Reported-by: Huang Daode <huangdaode@...ilicon.com>
>> Cc: Hanjun Guo <guohanjun@...wei.com>
>> Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
>> ---
>>  include/trace/events/xdp.h | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
>> index 4cd0f05..8989a92 100644
>> --- a/include/trace/events/xdp.h
>> +++ b/include/trace/events/xdp.h
>> @@ -8,6 +8,7 @@
>>  #include <linux/netdevice.h>
>>  #include <linux/filter.h>
>>  #include <linux/tracepoint.h>
>> +#include <linux/bpf.h>
>>  
>>  #define __XDP_ACT_MAP(FN)	\
>>  	FN(ABORTED)		\
> 
> Strange that I'm not see this compile issue, and kbuild-bot also didn't
> report it, but the patch looks okay to me... I guess I introduced the
> issue in below "fixes" commit.  Can the person applying this include
> the fixes line?

Xie, thanks for the patch! We could route this fix via bpf tree if you want.

Could you resend your patch with below Fixes and Acked-by tag added to
netdev@...r.kernel.org in Cc, so that it ends up in patchwork there?

> Fixes: 8d3b778ff544 ("xdp: tracepoint xdp_redirect also need a map argument")
> 
> Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>
Thanks,
Daniel

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