Subject: [PATCH v2 19/23] mm: rename balloon_compaction.(c|h) to balloon.(c|h)

From: "David Hildenbrand (Red Hat)" <[email-masked]>
Date: Thu, 15 Jan 2026 10:20:09 +0100

Even without CONFIG_BALLOON_COMPACTION this infrastructure implements
basic list and page management for a memory balloon.

Signed-off-by: David Hildenbrand (Red Hat) <[email-masked]>
---
 Documentation/core-api/mm-api.rst                 |  2 +-
 MAINTAINERS                                       |  4 ++--
 arch/powerpc/platforms/pseries/cmm.c              |  2 +-
 drivers/misc/vmw_balloon.c                        |  2 +-
 drivers/virtio/virtio_balloon.c                   |  2 +-
 include/linux/{balloon_compaction.h => balloon.h} | 11 +++++------
 mm/Makefile                                       |  2 +-
 mm/{balloon_compaction.c => balloon.c}            |  7 +++----
 8 files changed, 15 insertions(+), 17 deletions(-)
 rename include/linux/{balloon_compaction.h => balloon.h} (92%)
 rename mm/{balloon_compaction.c => balloon.c} (98%)

diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
index 68193a4cfcf52..aabdd3cba58e8 100644
--- a/Documentation/core-api/mm-api.rst
+++ b/Documentation/core-api/mm-api.rst
@@ -130,5 +130,5 @@ More Memory Management Functions
 .. kernel-doc:: mm/vmscan.c
 .. kernel-doc:: mm/memory_hotplug.c
 .. kernel-doc:: mm/mmu_notifier.c
-.. kernel-doc:: mm/balloon_compaction.c
+.. kernel-doc:: mm/balloon.c
 .. kernel-doc:: mm/huge_memory.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 0d044a58cbfe0..de8f89ca1149f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -27536,9 +27536,9 @@ M:	David Hildenbrand <[email-masked]>
 L:	[email-masked]
 S:	Maintained
 F:	drivers/virtio/virtio_balloon.c
-F:	include/linux/balloon_compaction.h
+F:	include/linux/balloon.h
 F:	include/uapi/linux/virtio_balloon.h
-F:	mm/balloon_compaction.c
+F:	mm/balloon.c
 
 VIRTIO BLOCK AND SCSI DRIVERS
 M:	"Michael S. Tsirkin" <[email-masked]>
diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 7fd8b3d7e7637..7a3c4922685ab 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -19,7 +19,7 @@
 #include <linux/stringify.h>
 #include <linux/swap.h>
 #include <linux/device.h>
-#include <linux/balloon_compaction.h>
+#include <linux/balloon.h>
 #include <asm/firmware.h>
 #include <asm/hvcall.h>
 #include <asm/mmu.h>
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 53e9335b6718c..7fd3f709108c2 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -29,7 +29,7 @@
 #include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
-#include <linux/balloon_compaction.h>
+#include <linux/balloon.h>
 #include <linux/vmw_vmci_defs.h>
 #include <linux/vmw_vmci_api.h>
 #include <asm/hypervisor.h>
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 6ae00de78b61b..de8041c3285a1 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -13,7 +13,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/module.h>
-#include <linux/balloon_compaction.h>
+#include <linux/balloon.h>
 #include <linux/oom.h>
 #include <linux/wait.h>
 #include <linux/mm.h>
diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon.h
similarity index 92%
rename from include/linux/balloon_compaction.h
rename to include/linux/balloon.h
index 7757e0e314fdb..82585542300d6 100644
--- a/include/linux/balloon_compaction.h
+++ b/include/linux/balloon.h
@@ -1,8 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * include/linux/balloon_compaction.h
- *
- * Common interface definitions for making balloon pages movable by compaction.
+ * Common interface for implementing a memory balloon, including support
+ * for migration of pages inflated in a memory balloon.
  *
  * Balloon page migration makes use of the general "movable_ops page migration"
  * feature.
@@ -35,8 +34,8 @@
  *
  * Copyright (C) 2012, Red Hat, Inc.  Rafael Aquini <[email-masked]>
  */
-#ifndef _LINUX_BALLOON_COMPACTION_H
-#define _LINUX_BALLOON_COMPACTION_H
+#ifndef _LINUX_BALLOON_H
+#define _LINUX_BALLOON_H
 #include <linux/pagemap.h>
 #include <linux/page-flags.h>
 #include <linux/migrate.h>
@@ -75,4 +74,4 @@ static inline void balloon_devinfo_init(struct balloon_dev_info *balloon)
 	balloon->migratepage = NULL;
 	balloon->adjust_managed_page_count = false;
 }
-#endif /* _LINUX_BALLOON_COMPACTION_H */
+#endif /* _LINUX_BALLOON_H */
diff --git a/mm/Makefile b/mm/Makefile
index 9175f8cc65658..1e31e0a528dc1 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -122,7 +122,7 @@ obj-$(CONFIG_CMA)	+= cma.o
 obj-$(CONFIG_NUMA) += numa.o
 obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o
 obj-$(CONFIG_NUMA_EMU) += numa_emulation.o
-obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
+obj-$(CONFIG_MEMORY_BALLOON) += balloon.o
 obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o
 obj-$(CONFIG_PAGE_TABLE_CHECK) += page_table_check.o
 obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o
diff --git a/mm/balloon_compaction.c b/mm/balloon.c
similarity index 98%
rename from mm/balloon_compaction.c
rename to mm/balloon.c
index f41e4a179a431..5734dae81e318 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon.c
@@ -1,15 +1,14 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * mm/balloon_compaction.c
- *
- * Common interface for making balloon pages movable by compaction.
+ * Common interface for implementing a memory balloon, including support
+ * for migration of pages inflated in a memory balloon.
  *
  * Copyright (C) 2012, Red Hat, Inc.  Rafael Aquini <[email-masked]>
  */
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/export.h>
-#include <linux/balloon_compaction.h>
+#include <linux/balloon.h>
 
 /*
  * Lock protecting the balloon_dev_info of all devices. We don't really
-- 
2.52.0