From: Ankit Agrawal <ankita@nvidia.com>
Date: Thu, 15 Jan 2026 20:28:48 +0000 (+0000)
Subject: mm: add stubs for PFNMAP memory failure registration functions
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=205e6d17cdf5b7f7b221bf64be9850eabce429c9;p=thirdparty%2Fkernel%2Flinux.git

mm: add stubs for PFNMAP memory failure registration functions

Add stubs to address CONFIG_MEMORY_FAILURE disabled.

Suggested-by: Alex Williamson <alex@shazbot.org>
Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20260115202849.2921-2-ankita@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
---

diff --git a/include/linux/memory-failure.h b/include/linux/memory-failure.h
index 7b5e11cf905ff..d333dcdbeae70 100644
--- a/include/linux/memory-failure.h
+++ b/include/linux/memory-failure.h
@@ -4,8 +4,6 @@
 
 #include <linux/interval_tree.h>
 
-struct pfn_address_space;
-
 struct pfn_address_space {
 	struct interval_tree_node node;
 	struct address_space *mapping;
@@ -13,7 +11,18 @@ struct pfn_address_space {
 				unsigned long pfn, pgoff_t *pgoff);
 };
 
+#ifdef CONFIG_MEMORY_FAILURE
 int register_pfn_address_space(struct pfn_address_space *pfn_space);
 void unregister_pfn_address_space(struct pfn_address_space *pfn_space);
+#else
+static inline int register_pfn_address_space(struct pfn_address_space *pfn_space)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void unregister_pfn_address_space(struct pfn_address_space *pfn_space)
+{
+}
+#endif /* CONFIG_MEMORY_FAILURE */
 
 #endif /* _LINUX_MEMORY_FAILURE_H */