linux-kernel - Re: [PATCH] mm/demotion: Fix kernel error with memory hotplug

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Date:   Thu, 25 Aug 2022 18:23:59 +0530
From:   Aneesh Kumar K V <aneesh.kumar@...ux.ibm.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
        Bharata B Rao <bharata@....com>
Subject: Re: [PATCH] mm/demotion: Fix kernel error with memory hotplug

On 8/25/22 5:46 PM, David Hildenbrand wrote:
> On 25.08.22 11:20, Aneesh Kumar K.V wrote:
>> On memory hot unplug, the kernel removes the node memory type
>> from the associated memory tier. Use list_del_init instead of
>> list del such that the same memory type can be added back
>> to a memory tier on hotplug.
>>
>> Without this, we get the below warning and return error on
>> adding memory type to a new memory tier.
>>
>> [   33.596095] ------------[ cut here ]------------
>> [   33.596099] WARNING: CPU: 3 PID: 667 at mm/memory-tiers.c:115 set_node_memory_tier+0xd6/0x2e0
>> [   33.596109] Modules linked in: kmem
>>
>> ...
>>
>> [   33.596126] RIP: 0010:set_node_memory_tier+0xd6/0x2e0
>>
>> ....
>> [   33.596196]  memtier_hotplug_callback+0x48/0x68
>> [   33.596204]  blocking_notifier_call_chain+0x80/0xc0
>> [   33.596211]  online_pages+0x25e/0x280
>> [   33.596218]  memory_block_change_state+0x176/0x1f0
>> [   33.596225]  memory_subsys_online+0x37/0x40
>> [   33.596230]  online_store+0x9b/0x130
>> [   33.596236]  kernfs_fop_write_iter+0x128/0x1b0
>> [   33.596242]  vfs_write+0x24b/0x2c0
>> [   33.596249]  ksys_write+0x74/0xe0
>> [   33.596254]  do_syscall_64+0x43/0x90
>> [   33.596259]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Fixes: mm/demotion: Add hotplug callbacks to handle new numa node onlined
> 
> Do we have a proper 12-digit commit id as well?
> 
> Do we have to cc stable?
> 

That patch is not yet merged upstream. It is in mm-unstable. I guess Andrew can fold the change
into the original patch?

-aneesh