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Mon, 11 May 2026 09:12:27 +0000 (GMT) Received: from [9.123.6.34] (unknown [9.123.6.34]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Mon, 11 May 2026 09:12:27 +0000 (GMT) Message-ID: <67f5b175-7a9e-4693-95ce-84d4b42e6b45@linux.ibm.com> Date: Mon, 11 May 2026 14:42:25 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory_hotplug: Factor out altmap freeing checks To: Muchun Song , David Hildenbrand , Oscar Salvador , Andrew Morton , linux-mm@kvack.org Cc: muchun.song@linux.dev, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260511084307.1827127-1-songmuchun@bytedance.com> Content-Language: en-US From: Donet Tom In-Reply-To: <20260511084307.1827127-1-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=BezoFLt2 c=1 sm=1 tr=0 ts=6a019d7f cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=968KyxNXAAAA:8 a=VnNF1IyMAAAA:8 a=Uail7pCi9VyjTqRTir0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: fdcB4qRrTqLF4DtyW6B9LVSZHJfAxZTf X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTExMDEwMCBTYWx0ZWRfX2eRwCj+7uMQ5 v4MWT3UjCyTxnkpX5VQqYC2W6PoVj8rr4nO4raC+au2LCS/78p8LRvXsy4BK9Sdc8H/230Vpclh KAnCZ0CVm9NsfgE3+r/amdhaFDcyepqwKORgXidpkRIHcQiyDvoj8xvaXKDtdLAqz87/O/1n3pF Yq2HiZSPwcOtya14p4K1r/8qgWsKtHLbm+RpHUVJVPPHFYdHy98eVm0izUj1iIA89F+8sOFObPT lDRgAM09w4ZEc+/PrBRMk9EY3jrBn0tJk4jlzwtb+SZViMiRU6L3pG6AGXDbbTHYYNzqkWtFW88 fZyKrTAnBt8KBmM7E1JaflYz6e13NmJcceRviG6KAI3ZTE7JZQz+I76i/iTxztMARb5oCeWuspC tShFtx6ep4nFPs5m+6iO4X8hao4qLdYlPJzW+b6o6joqBgpMOqSw2CBcO4JmtLNdNFwmfYnNgnd YAqBu8qeBZ+H+LZ9fKw== X-Proofpoint-ORIG-GUID: fdcB4qRrTqLF4DtyW6B9LVSZHJfAxZTf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-11_02,2026-05-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 bulkscore=0 phishscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605110100 X-Rspam-User: X-Rspamd-Queue-Id: E10684000D X-Rspamd-Server: rspam04 X-Stat-Signature: jrw3ri98jpgcz756qq6ozhki9ozf5qah X-HE-Tag: 1778490768-267873 X-HE-Meta: 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 ZXHlH4bN SST+8FmILBdmF5sMsE8avQaYsv1PQ5dtQW8X2KvgnuqooCD4lwas/7u/P8vovQT8CRx5Ezu//c2NFVVqlg8GT4QuCNHPUFv08acbEK6X5FhqVNPq62BL35FEgls8Hhn3kQNTpY4Le6U1ZCoO2v6Re63y2WpZtvJQPCumbbLTDDrZGtLq681IxlduXX1EXgS8HInt7413teVIMmJZD5ke5vPg1oL+MjK/gCJVjnAHF7aIOUrgeVBSC+XdnfI2Cji/1tBU+RekOEGrzrUgWhrJdGdmfgrzpRUWUIsQFdi6DgsPnR4ebowdutr5mIPhXGU5wtuFwUgkBAJJd8HVTY33n7bWfZLiIEDGBG8SENuzILiLIGMyYG5Uhsvm5TcP/Z5PlaVjRJUbl3YsZq54= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/11/26 2:13 PM, Muchun Song wrote: > Use a small helper to centralize altmap freeing after verifying that all > vmemmap pages were released. This keeps the check consistent between the > normal teardown path and the memory hotplug error paths. > > Suggested-by: David Hildenbrand (Arm) > Signed-off-by: Muchun Song looks good to me. Reviewed-by: Donet Tom -Donet > --- > mm/memory_hotplug.c | 16 +++++++++------- > 1 file changed, 9 insertions(+), 7 deletions(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 462d8dcd636d..af5489f03771 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -1403,6 +1403,12 @@ bool mhp_supports_memmap_on_memory(void) > } > EXPORT_SYMBOL_GPL(mhp_supports_memmap_on_memory); > > +static void altmap_free(struct vmem_altmap *altmap) > +{ > + WARN_ONCE(altmap->alloc, "Altmap not fully unmapped"); > + kfree(altmap); > +} > + > static void remove_memory_blocks_and_altmaps(u64 start, u64 size) > { > unsigned long memblock_size = memory_block_size_bytes(); > @@ -1427,12 +1433,8 @@ static void remove_memory_blocks_and_altmaps(u64 start, u64 size) > put_device(&mem->dev); > > remove_memory_block_devices(cur_start, memblock_size); > - > arch_remove_memory(cur_start, memblock_size, altmap, NULL); > - > - /* Verify that all vmemmap pages have actually been freed. */ > - WARN(altmap->alloc, "Altmap not fully unmapped"); > - kfree(altmap); > + altmap_free(altmap); > } > } > > @@ -1463,7 +1465,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group, > /* call arch's memory hotadd */ > ret = arch_add_memory(nid, cur_start, memblock_size, ¶ms); > if (ret < 0) { > - kfree(params.altmap); > + altmap_free(params.altmap); > goto out; > } > > @@ -1472,7 +1474,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group, > params.altmap, group); > if (ret) { > arch_remove_memory(cur_start, memblock_size, params.altmap, NULL); > - kfree(params.altmap); > + altmap_free(params.altmap); > goto out; > } > } > > base-commit: e98d21c170b01ddef366f023bbfcf6b31509fa83