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

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Date:   Mon, 21 Mar 2022 23:18:33 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the net-next tree

On 21 Mar 14:45, Jakub Kicinski wrote:
>On Mon, 21 Mar 2022 18:39:41 +1100 Stephen Rothwell wrote:
>> Hi all,
>>
>> After merging the net-next tree, today's linux-next build (x86_64
>> allmodconfig) failed like this:
>>
>> In file included from include/linux/string.h:253,
>>                  from include/linux/bitmap.h:11,
>>                  from include/linux/cpumask.h:12,
>>                  from arch/x86/include/asm/cpumask.h:5,
>>                  from arch/x86/include/asm/msr.h:11,
>>                  from arch/x86/include/asm/processor.h:22,
>>                  from arch/x86/include/asm/timex.h:5,
>>                  from include/linux/timex.h:65,
>>                  from include/linux/time32.h:13,
>>                  from include/linux/time.h:60,
>>                  from include/linux/ktime.h:24,
>>                  from include/linux/timer.h:6,
>>                  from include/linux/netdevice.h:24,
>>                  from include/trace/events/xdp.h:8,
>>                  from include/linux/bpf_trace.h:5,
>>                  from drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c:33:
>> In function 'fortify_memset_chk',
>>     inlined from 'mlx5e_xmit_xdp_frame' at drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c:438:3:
>> include/linux/fortify-string.h:242:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
>>   242 |                         __write_overflow_field(p_size_field, size);
>>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> Caused by commit
>>
>>   9ded70fa1d81 ("net/mlx5e: Don't prefill WQEs in XDP SQ in the multi buffer mode")
>>
>> exposed by the kspp tree.
>>
>> I have applied the following fix patch for today (a better one is
>> probably possible).
>
>Hi Saeed,
>
>thoughts?
>

I forgot about this warning in net :-/ we did a similar patch to net to
avoid it, Stephen's patch is correct, 
I will submit his fixup to net-next in the morning.