[PATCH 3/3] mm, memory_hotplug: move movable_node to the hotplug proper

From: Michal Hocko
Date: Mon May 29 2017 - 07:42:08 EST


From: Michal Hocko <mhocko@xxxxxxxx>

movable_node_is_enabled is defined in memblock proper while it
is initialized from the memory hotplug proper. This is quite messy
and it makes a dependency between the two so move movable_node along
with the helper functions to memory_hotplug.

To make it more entertaining the kernel parameter is ignored unless
CONFIG_HAVE_MEMBLOCK_NODE_MAP=y because we do not have the node
information for each memblock otherwise. So let's warn when the option
is disabled.

Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
---
include/linux/memblock.h | 7 -------
include/linux/memory_hotplug.h | 10 ++++++++++
mm/memblock.c | 1 -
mm/memory_hotplug.c | 6 ++++++
4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 9622fb8c101b..071692894254 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -57,8 +57,6 @@ struct memblock {

extern struct memblock memblock;
extern int memblock_debug;
-/* If movable_node boot option specified */
-extern bool movable_node_enabled;

#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
#define __init_memblock __meminit
@@ -171,11 +169,6 @@ static inline bool memblock_is_hotpluggable(struct memblock_region *m)
return m->flags & MEMBLOCK_HOTPLUG;
}

-static inline bool __init_memblock movable_node_is_enabled(void)
-{
- return movable_node_enabled;
-}
-
static inline bool memblock_is_mirror(struct memblock_region *m)
{
return m->flags & MEMBLOCK_MIRROR;
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 9e0249d0f5e4..d6e5e63b31d5 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -115,6 +115,12 @@ extern void __online_page_free(struct page *page);
extern int try_online_node(int nid);

extern bool memhp_auto_online;
+/* If movable_node boot option specified */
+extern bool movable_node_enabled;
+static inline bool movable_node_is_enabled(void)
+{
+ return movable_node_enabled;
+}

#ifdef CONFIG_MEMORY_HOTREMOVE
extern bool is_pageblock_removable_nolock(struct page *page);
@@ -266,6 +272,10 @@ static inline void put_online_mems(void) {}
static inline void mem_hotplug_begin(void) {}
static inline void mem_hotplug_done(void) {}

+static inline bool movable_node_is_enabled(void)
+{
+ return false;
+}
#endif /* ! CONFIG_MEMORY_HOTPLUG */

#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/mm/memblock.c b/mm/memblock.c
index 4895f5a6cf7e..8c52fb11510c 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -54,7 +54,6 @@ struct memblock memblock __initdata_memblock = {
};

int memblock_debug __initdata_memblock;
-bool movable_node_enabled __initdata_memblock = false;
static bool system_has_some_mirror __initdata_memblock = false;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2a14f8c18a22..1a148b35e8a3 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -79,6 +79,8 @@ static struct {
#define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map)
#define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map)

+bool movable_node_enabled = false;
+
#ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE
bool memhp_auto_online;
#else
@@ -1561,7 +1563,11 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)

static int __init cmdline_parse_movable_node(char *p)
{
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
movable_node_enabled = true;
+#else
+ pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n");
+#endif
return 0;
}
early_param("movable_node", cmdline_parse_movable_node);
--
2.11.0