linux-kernel - Re: [PATCH] powerpc: fix the allyesconfig build

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Message-ID: <cfdea690-9866-7eda-904c-c097ea89a0ed@huawei.com>
Date:   Mon, 30 Nov 2020 08:58:37 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
CC:     Michael Ellerman <mpe@...erman.id.au>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Daniel Axtens" <dja@...ens.net>, Joel Stanley <joel@....id.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        <linux-renesas-soc@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        Huazhong Tan <tanhuazhong@...wei.com>
Subject: Re: [PATCH] powerpc: fix the allyesconfig build

On 2020/11/29 3:36, Jakub Kicinski wrote:
> On Sat, 28 Nov 2020 16:20:54 +1100 Stephen Rothwell wrote:
>> On Fri, 27 Nov 2020 17:56:42 -0800 Jakub Kicinski <kuba@...nel.org> wrote:
>>>
>>> What's the offending structure in hisilicon? I'd rather have a look
>>> packing structs with pointers in 'em sounds questionable.
>>>
>>> I only see these two:
>>>
>>> $ git grep packed drivers/net/ethernet/hisilicon/
>>> drivers/net/ethernet/hisilicon/hns/hnae.h:struct __packed hnae_desc {
>>> drivers/net/ethernet/hisilicon/hns3/hns3_enet.h:struct __packed hns3_desc {  
>>
>> struct hclge_dbg_reg_type_info which is 28 bytes long due to the
>> included struct struct hclge_dbg_reg_common_msg (which is 12 bytes
>> long).  They are surrounded by #pragma pack(1)/pack().
>>
>> This forces the 2 pointers in each second array element of
>> hclge_dbg_reg_info[] to be 4 byte aligned (where pointers are 8 bytes
>> long on PPC64).
> 
> Ah! Thanks, I don't see a reason for these to be packed. 
> Looks  like an accident, there is no reason to pack anything 
> past struct hclge_dbg_reg_common_msg AFAICT.
> 
> Huawei folks, would you mind sending a fix if the analysis is correct?

Yes, will send a patch to fix that. Thanks for the analysis.

> .
>