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-rw-r--r--kernel/memremap.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 3eb8944265d5..e517a16cb426 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -169,6 +169,18 @@ struct page_map {
struct vmem_altmap altmap;
};
+void get_zone_device_page(struct page *page)
+{
+ percpu_ref_get(page->pgmap->ref);
+}
+EXPORT_SYMBOL(get_zone_device_page);
+
+void put_zone_device_page(struct page *page)
+{
+ put_dev_pagemap(page->pgmap);
+}
+EXPORT_SYMBOL(put_zone_device_page);
+
static void pgmap_radix_release(struct resource *res)
{
resource_size_t key;