linux-kernel - [PATCH 3/5] mm: export zap_page_range_single and list_lru

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Message-ID: <20260205-binder-tristate-v1-3-dfc947c35d35@google.com>
Date: Thu, 05 Feb 2026 10:51:28 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Carlos Llamas <cmllamas@...gle.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>, 
	"Serge E. Hallyn" <serge@...lyn.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Dave Chinner <david@...morbit.com>, Qi Zheng <zhengqi.arch@...edance.com>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Muchun Song <muchun.song@...ux.dev>, 
	David Hildenbrand <david@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, kernel-team@...roid.com, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, 
	linux-mm@...ck.org, rust-for-linux@...r.kernel.org, 
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH 3/5] mm: export zap_page_range_single and list_lru_add/del

These are the functions needed by Binder's shrinker.

Binder uses zap_page_range_single in the shrinker path to remove an
unused page from the mmap'd region. Note that pages are only removed
from the mmap'd region lazily when shrinker asks for it.

Binder uses list_lru_add/del to keep track of the shrinker lru list, and
it can't use _obj because the list head is not stored inline in the page
actually being lru freed, so page_to_nid(virt_to_page(item)) on the list
head computes the nid of the wrong page.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
 mm/list_lru.c | 2 ++
 mm/memory.c   | 1 +
 2 files changed, 3 insertions(+)

diff --git a/mm/list_lru.c b/mm/list_lru.c
index ec48b5dadf519a5296ac14cda035c067f9e448f8..bf95d73c9815548a19db6345f856cee9baad22e3 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -179,6 +179,7 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item, int nid,
 	unlock_list_lru(l, false);
 	return false;
 }
+EXPORT_SYMBOL_GPL(list_lru_add);
 
 bool list_lru_add_obj(struct list_lru *lru, struct list_head *item)
 {
@@ -216,6 +217,7 @@ bool list_lru_del(struct list_lru *lru, struct list_head *item, int nid,
 	unlock_list_lru(l, false);
 	return false;
 }
+EXPORT_SYMBOL_GPL(list_lru_del);
 
 bool list_lru_del_obj(struct list_lru *lru, struct list_head *item)
 {
diff --git a/mm/memory.c b/mm/memory.c
index da360a6eb8a48e29293430d0c577fb4b6ec58099..64083ace239a2caf58e1645dd5d91a41d61492c4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2168,6 +2168,7 @@ void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
 	zap_page_range_single_batched(&tlb, vma, address, size, details);
 	tlb_finish_mmu(&tlb);
 }
+EXPORT_SYMBOL(zap_page_range_single);
 
 /**
  * zap_vma_ptes - remove ptes mapping the vma

-- 
2.53.0.rc2.204.g2597b5adb4-goog