linux-kernel - [PATCH v1 2/3] mm: add stubs for PFNMAP memory failure registration functions

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Message-ID: <20251211070603.338701-3-ankita@nvidia.com>
Date: Thu, 11 Dec 2025 07:06:02 +0000
From: <ankita@...dia.com>
To: <ankita@...dia.com>, <vsethi@...dia.com>, <jgg@...dia.com>,
	<mochs@...dia.com>, <jgg@...pe.ca>, <skolothumtho@...dia.com>,
	<alex@...zbot.org>, <akpm@...ux-foundation.org>, <linmiaohe@...wei.com>,
	<nao.horiguchi@...il.com>
CC: <cjia@...dia.com>, <zhiw@...dia.com>, <kjaju@...dia.com>,
	<yishaih@...dia.com>, <kevin.tian@...el.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH v1 2/3] mm: add stubs for PFNMAP memory failure registration functions

From: Ankit Agrawal <ankita@...dia.com>

Add stubs to address CONFIG_MEMORY_FAILURE disabled.

Suggested-by: Alex Williamson <alex@...zbot.org>
Signed-off-by: Ankit Agrawal <ankita@...dia.com>
---
 include/linux/memory-failure.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/linux/memory-failure.h b/include/linux/memory-failure.h
index 7b5e11cf905f..d333dcdbeae7 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 */
-- 
2.34.1