From 310183de7bb2ed114a80d057690ddb23d0cfe814 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Fri, 9 Aug 2024 14:48:50 +0300
Subject: mm: introduce PageUnaccepted() page type

The new page type allows physical memory scanners to detect unaccepted
memory and handle it accordingly.

The page type is serialized with zone lock.

Link: https://lkml.kernel.org/r/20240809114854.3745464-5-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/page-flags.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include')

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index a0a29bd092f8..17175a328e6b 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -939,6 +939,7 @@ enum pagetype {
 	PG_hugetlb	= 0x04000000,
 	PG_slab		= 0x02000000,
 	PG_zsmalloc	= 0x01000000,
+	PG_unaccepted	= 0x00800000,
 
 	PAGE_TYPE_BASE	= 0x80000000,
 
@@ -1072,6 +1073,13 @@ FOLIO_TEST_FLAG_FALSE(hugetlb)
 
 PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc)
 
+/*
+ * Mark pages that has to be accepted before touched for the first time.
+ *
+ * Serialized with zone lock.
+ */
+PAGE_TYPE_OPS(Unaccepted, unaccepted, unaccepted)
+
 /**
  * PageHuge - Determine if the page belongs to hugetlbfs
  * @page: The page to test.
-- 
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