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Thu, 18 Sep 2025 21:20:34 +0800 From: Kefeng Wang To: Andrew Morton , David Hildenbrand , Oscar Salvador , Muchun Song , Zi Yan , Matthew Wilcox CC: , , Vlastimil Babka , Brendan Jackman , Johannes Weiner , , Kefeng Wang Subject: [PATCH v2 4/8] mm: page_alloc: add split_non_compound_page() Date: Thu, 18 Sep 2025 21:19:56 +0800 Message-ID: <20250918132000.1951232-5-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20250918132000.1951232-1-wangkefeng.wang@huawei.com> References: <20250918132000.1951232-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To dggpemf100008.china.huawei.com (7.185.36.138) X-Stat-Signature: afxo8kzk5nn47hbsz5snk4ysw4pjw7db X-Rspam-User: X-Rspamd-Queue-Id: F0819180019 X-Rspamd-Server: rspam10 X-HE-Tag: 1758201639-523743 X-HE-Meta: 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 6MU/cCLK triFSG3TCWcUOz72piXa8K718E/Xu3wO6GNVZTL+eYbngj3smdscURYsGxqYv6OOwcVLeBOXNp0roriQNCeSQaV8KzqmoGd5lWJ4T+uu947b6N0Q1bpCTj75CNcWIS0woQ5rq5nHgL/CzUwG87wYvLlStlLIustQ0sSfW6vcnhijvpC8kw0kZmKbUgjAy11aOTaEJhDM9hmFrgt2b+prB0nv3PhTskSDC7ycxiK/TZJXGok0ot13TOhut4Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add new split_non_compound_page() to simplify make_alloc_exact(). Signed-off-by: Kefeng Wang --- mm/page_alloc.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b6eeae39f4d0..e1d229b75f27 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3042,6 +3042,15 @@ void free_unref_folios(struct folio_batch *folios) folio_batch_reinit(folios); } +static void split_non_compound_page(struct page *page, unsigned int order) +{ + VM_BUG_ON_PAGE(PageCompound(page), page); + + split_page_owner(page, order, 0); + pgalloc_tag_split(page_folio(page), order, 0); + split_page_memcg(page, order); +} + /* * split_page takes a non-compound higher-order page, and splits it into * n (1<