linux-kernel - Re: [PATCH] arp: Remove the arp_hh

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Date:   Mon, 22 Feb 2021 09:07:13 -0700
From:   David Ahern <dsahern@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Yejune Deng <yejune.deng@...il.com>, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH] arp: Remove the arp_hh_ops structure

On 2/22/21 1:37 AM, Eric Dumazet wrote:
> 
> 
> On 2/22/21 4:15 AM, Yejune Deng wrote:
>> The arp_hh_ops structure is similar to the arp_generic_ops structure.
>> but the latter is more general,so remove the arp_hh_ops structure.
>>
>> Fix when took out the neigh->ops assignment:
>> 8.973653] #PF: supervisor read access in kernel mode
>> [    8.975027] #PF: error_code(0x0000) - not-present page
>> [    8.976310] PGD 0 P4D 0
>> [    8.977036] Oops: 0000 [#1] SMP PTI
>> [    8.977973] CPU: 1 PID: 210 Comm: sd-resolve Not tainted 5.11.0-rc7-02046-g4591591ab715 #1
>> [    8.979998] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
>> [    8.981996] RIP: 0010:neigh_probe (kbuild/src/consumer/net/core/neighbour.c:1009)
>>
> 
> I have a hard time understanding this patch submission.
> 
> This seems a mix of a net-next and net material ?

It is net-next at best.

> 
> 
> 
>> Reported-by: kernel test robot <oliver.sang@...el.com>
> 
> If this is a bug fix, we want a Fixes: tag
> 
> This will really help us. Please don't let us guess what is going on.
> 

This patch is a v2. v1 was clearly wrong and not tested; I responded as
such 12 hours before the robot test.