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Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev References: <20260924075259.2013039-1-songmuchun@bytedance.com> <20260924075259.2013039-7-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20260924075259.2013039-7-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 2D559160004 X-Stat-Signature: 3dhi1d6igpfxx9bqkxwme6kmi3e5zune X-Rspam-User: X-HE-Tag: 1790560787-159928 X-HE-Meta: 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 OnBbHjfW DEXu6+F0IJ/R5fUrDvqIBFdXSYDhvyCWadGo/hqb6PwKPBQBtJKv1ccA+TQHeBHQI0nUI7HEPvNhCzicNOuPiA0tKdMwfVAEY6lXfnkfxkh6OUvpkxGo4ApwUhNyFJIUtLKfE0aLcZyAPsmSTEKKZKUrtq91805NEixUIy6xbYQBP045kO8VRhMN151hZF2g9oEOuAPhK0d+e78QKPcZl8VJCAs2K1zIuXlTiPyk7J5EJouet7D+FGN/gyzNPaNdyF/eo50JWe7tNEM+lQQe/RjilTqxkW+YIcIQsgk8J6eeqC33bmKlCOraaGhXq9Y6sO9vhM+kvkrMvcpJlNP74cXPNDtMpZY+aIRAD Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/24/26 3:52 PM, Muchun Song wrote: > For vmemmap-optimized sections, tail struct pages may be backed by > shared vmemmap pages. Those shared pages must carry the same page zone > ID as the struct pages initialized for the section. > > Warn in __init_single_page() if the shared tail page has a different > page_zone_id(), which would indicate inconsistent initialization. > > Signed-off-by: Muchun Song > --- > v2: > - New patch. > --- > mm/mm_init.c | 3 +++ > 1 file changed, 3 insertions(+) Acked-by: Qi Zheng Thanks, Qi > > diff --git a/mm/mm_init.c b/mm/mm_init.c > index 1650d6bc1211..bd02e8d06965 100644 > --- a/mm/mm_init.c > +++ b/mm/mm_init.c > @@ -609,6 +609,9 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn, > if (!is_highmem_idx(zone)) > set_page_address(page, __va(pfn << PAGE_SHIFT)); > #endif > + VM_WARN_ON_ONCE(vmemmap_optimizable_order(pfn_to_section_compound_order(pfn)) && > + page_zone_id(page + VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) != > + page_zone_id(page)); > } > > #ifdef CONFIG_NUMA