Subject: Re: linux-next: build warning after merge of the net-next tree

From: "Gustavo A. R. Silva" <[email-masked]>
Date: Tue, 18 Dec 2018 21:07:06 -0600

Hi Stephen,

On 12/18/18 8:42 PM, Stephen Rothwell wrote:
> Hi all,
> 
> On Thu, 29 Nov 2018 11:24:28 +1100 Stephen Rothwell <[email-masked]> wrote:
>>
>> After merging the net-next tree, today's linux-next build
>> (x86_64_allmodconfig) produced this warning:
>>
>> drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c: In function 'run_xdp':
>> drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c:324:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>     bpf_warn_invalid_xdp_action(xdp_act);
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c:325:2: note: here
>>    case XDP_ABORTED:
>>    ^~~~
>> drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c:326:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>     trace_xdp_exception(priv->net_dev, xdp_prog, xdp_act);
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c:327:2: note: here
>>    case XDP_DROP:
>>    ^~~~
>>
>> Introduced by commit
>>
>>    7e273a8ebdd3 ("dpaa2-eth: Add basic XDP support")
>>
>> This due to my use of -Wimplicit-fallthrough.  This is new code.  The
>> warning can be suppressed by adding a comment like /* fall through */
>> at the appropriate places to indicate that the fallthrough is intended.
> 
> I am still seeing these warnings.
> 

That's weird. I don't see them anymore in next-20181218.

They were fixed by this commit: c1cb11bcbd09f5f027cbc7fadddab169714948df

Thanks