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b=CUbiQPlRNLrGAaISfsMY2lKId+9XnZt02rpJWrZt0iiXTBPY5ps7EvIeCm49fjIVC QTGVocVVcGV1jQbSkMvGtW692LfGFij4mHu5VN1jur1x+xpTGe4z7ZNYrUsR49ViUR oTJfADXQm1srqI0ZrACTDBgaizDXw2H4x68GvqMOPa7GpXhf6dBxFUQVHYbSbS0Ocg Kr2xS3Er8g52fpOCoxyesm6VGfy3j+i4inOa8JNrwyIvK8Yn6oBXcWw853SY+z+Q88 7eKpSTwmSHMy0+w/aTGBKIPE4lo+L2QC9aiKrHpMkBGPfccrQQP7niAIhFOWDwoztW a7g0HvZ7xRLdQ== Message-ID: Date: Wed, 1 Jul 2026 10:35:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug To: Gregory Price , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, kernel-team@meta.com, osalvador@suse.de, akpm@linux-foundation.org, rppt@kernel.org, mgorman@techsingularity.net, hannes@cmpxchg.org, vbabka@kernel.org References: <20260630214039.2263562-1-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260630214039.2263562-1-gourry@gourry.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1F4B020006 X-Rspam-User: X-Stat-Signature: hgp7ya6amuene9kpykskap8zasqqinab X-HE-Tag: 1782894946-331028 X-HE-Meta: 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 I4R4LDMx 865AMX3uKKzg1NPF6QFNCrR1JVw5hwg1gRzvSda+T+WDGTG+n6YZQv/NbmhQSk3Hr2ibn8aTNDxAG/ehRXRc7huRS9ZAVHFbAHCSZR7vDnIg0iNSJyqKGFnnTA2F4CFktpZW9WtoKcrnElG/3YWvEWYvXhkhMrsLmVgiNTv+DaqPVqXDRJclQHrUHvLWM3lvNtdRi5IFP7D7yXzamiB3RUlGGqcbS17wY8wTD8zi7CUmih+tNN3jFKbXogNZtCiTC2BcQVeNQyY7mGmNRaA8zLUP3iHJafM2unVPnioRnBQTPrzY4eln0l4V5Yw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > * The node we allocated has no zone fallback lists. For avoiding > diff --git a/mm/mm_init.c b/mm/mm_init.c > index 306ea5c13f54..37fd64ce144d 100644 > --- a/mm/mm_init.c > +++ b/mm/mm_init.c > @@ -1536,7 +1536,7 @@ void __init set_pageblock_order(void) > * NOTE: this function is only called during memory hotplug > */ > #ifdef CONFIG_MEMORY_HOTPLUG > -void __ref free_area_init_core_hotplug(struct pglist_data *pgdat) > +int __ref free_area_init_core_hotplug(struct pglist_data *pgdat) > { > int nid = pgdat->node_id; > enum zone_type z; > @@ -1544,8 +1544,14 @@ void __ref free_area_init_core_hotplug(struct pglist_data *pgdat) > > pgdat_init_internals(pgdat); > > - if (pgdat->per_cpu_nodestats == &boot_nodestats) > - pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); > + if (pgdat->per_cpu_nodestats == &boot_nodestats) { > + struct per_cpu_nodestat __percpu *p; > + > + p = alloc_percpu(struct per_cpu_nodestat); > + if (!p) > + return -ENOMEM; > + pgdat->per_cpu_nodestats = p; Is there a need for the temporary variable? Also how to handle cleanup on error? Or why can we skip cleanup? (what happens if we get another call to __try_online_node() later?) -- Cheers, David