linux-kernel - Re: [PATCH v2 03/23] powerpc/pseries/cmm: remove cmm_balloon_compaction

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Message-ID: <47108ae5-fc73-432f-9942-c2fe5fbf4bb5@kernel.org>
Date: Mon, 19 Jan 2026 23:44:47 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 linuxppc-dev@...ts.ozlabs.org,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, linux-doc@...r.kernel.org,
 virtualization@...ts.linux.dev, Andrew Morton <akpm@...ux-foundation.org>,
 Oscar Salvador <osalvador@...e.de>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>,
 Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.com>, Jonathan Corbet <corbet@....net>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Arnd Bergmann
 <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jerrin Shaji George <jerrin.shaji-george@...adcom.com>,
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v2 03/23] powerpc/pseries/cmm: remove
 cmm_balloon_compaction_init()

>> @@ -573,11 +567,12 @@ static int cmm_init(void)
>>   		return -EOPNOTSUPP;
>>
>>   	balloon_devinfo_init(&b_dev_info);
>> -	cmm_balloon_compaction_init();
>> +	if (IS_ENABLED(CONFIG_BALLOON_COMPACTION))
>> +		b_dev_info.migratepage = cmm_migratepage;
>>
>>   	rc = register_oom_notifier(&cmm_oom_nb);
>>   	if (rc < 0)
>> -		goto out_balloon_compaction;
>> +		return rc;
>>
>>   	if ((rc = register_reboot_notifier(&cmm_reboot_nb)))
>>   		goto out_oom_notifier;
>> @@ -606,7 +601,6 @@ static int cmm_init(void)
>>   	unregister_reboot_notifier(&cmm_reboot_nb);
>>   out_oom_notifier:
>>   	unregister_oom_notifier(&cmm_oom_nb);
>> -out_balloon_compaction:
> 
> So silly, I assume before there was more that happened here?

Right, I commented that above in the patch description.

Thanks!

-- 
Cheers

David