[PATCH v5 09/15] linux/mm.h: move devmap-related declarations to mm/devmap_managed.h

Max Kellermann
2024-04-30T15:29:55Z

Prepare to reduce dependencies on linux/mm.h.

put_devmap_managed_page() is called by put_page(). Moving it to a
separate header allows us to move put_page() to a separate lean header
as well.

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
---
include/linux/mm.h | 20 +------------------
include/linux/mm/devmap_managed.h | 32 +++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+), 19 deletions(-)
create mode 100644 include/linux/mm/devmap_managed.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5b3d56454344..9539ba12b99d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2,6 +2,7 @@
#ifndef _LINUX_MM_H
#define _LINUX_MM_H

+#include <linux/mm/devmap_managed.h>
#include <linux/mm/folio_next.h>
#include <linux/mm/folio_size.h>
#include <linux/mm/page_address.h>
@@ -1364,25 +1365,6 @@ vm_fault_t finish_fault(struct vm_fault *vmf);
* back into memory.
*/

-#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX)
-DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
-
-bool __put_devmap_managed_folio_refs(struct folio *folio, int refs);
-static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
-{
- if (!static_branch_unlikely(&devmap_managed_key))
- return false;
- if (!folio_is_zone_device(folio))
- return false;
- return __put_devmap_managed_folio_refs(folio, refs);
-}
-#else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
-static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
-{
- return false;
-}
-#endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
-
/* 127: arbitrary random number, small enough to assemble well */
#define folio_ref_zero_or_close_to_overflow(folio) \
((unsigned int) folio_ref_count(folio) + 127u <= 127u)
diff --git a/include/linux/mm/devmap_managed.h b/include/linux/mm/devmap_managed.h
new file mode 100644
index 000000000000..50357b304d68
--- /dev/null
+++ b/include/linux/mm/devmap_managed.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_MM_DEVMAP_MANAGED_H
+#define _LINUX_MM_DEVMAP_MANAGED_H
+
+#include <linux/types.h> // for bool
+
+struct page;
+
+#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX)
+
+#include <linux/jump_label.h> // for DECLARE_STATIC_KEY_FALSE(), static_branch_unlikely()
+#include <linux/mmzone.h> // folio_is_zone_device()
+
+DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
+
+bool __put_devmap_managed_folio_refs(struct folio *folio, int refs);
+static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
+{
+ if (!static_branch_unlikely(&devmap_managed_key))
+ return false;
+ if (!folio_is_zone_device(folio))
+ return false;
+ return __put_devmap_managed_folio_refs(folio, refs);
+}
+#else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
+static inline bool put_devmap_managed_folio_refs(struct folio *folio, int refs)
+{
+ return false;
+}
+#endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
+
+#endif /* _LINUX_MM_DEVMAP_MANAGED_H */
--
2.39.2