linux-kernel - [RFC PATCH 2/9] mm: add page

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Message-Id: <20250724084441.380404-3-link@vivo.com>
Date: Thu, 24 Jul 2025 16:44:30 +0800
From: Huan Yang <link@...o.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Rik van Riel <riel@...riel.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>,
	Xu Xin <xu.xin16@....com.cn>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Zi Yan <ziy@...dia.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Joshua Hahn <joshua.hahnjy@...il.com>,
	Rakie Kim <rakie.kim@...com>,
	Byungchul Park <byungchul@...com>,
	Gregory Price <gourry@...rry.net>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Alistair Popple <apopple@...dia.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Huan Yang <link@...o.com>,
	Christian Brauner <brauner@...nel.org>,
	Usama Arif <usamaarif642@...il.com>,
	Yu Zhao <yuzhao@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [RFC PATCH 2/9] mm: add page_type value helper

Add two helper functions __SetPageXXXValue and __GetPageXXXValue to
assist in assigning values to the specified page_type. Since the current
page_type value is not supported on large folio, only the page version
of the helper functions is provided.

Signed-off-by: Huan Yang <link@...o.com>
---
 include/linux/page-flags.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 3c7103c2eee4..52c9435079d5 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -1024,6 +1024,23 @@ static __always_inline void __ClearPage##uname(struct page *page)	\
 		return;							\
 	VM_BUG_ON_PAGE(!Page##uname(page), page);			\
 	page->page_type = UINT_MAX;					\
+}									\
+static __always_inline void __PageSet##uname##Value(struct page *page,	\
+						    unsigned int value) \
+{									\
+	if (!Page##uname(page))						\
+		return;							\
+	if (unlikely(value > (PAGE_TYPE_MASK)))				\
+		return;							\
+	WRITE_ONCE(page->page_type, (unsigned int)PGTY_##lname		\
+				    << PAGE_TYPE_SHIFT | value);	\
+}									\
+static __always_inline unsigned int __PageGet##uname##Value(		\
+				    struct page *page)			\
+{									\
+	if (!Page##uname(page))						\
+		return 0;						\
+	return READ_ONCE(page->page_type) & PAGE_TYPE_MASK;		\
 }
 
 /*
-- 
2.34.1