[PATCH v2 7/8] mm/memory_hotplug: convert memhp_auto_online to store an online_type

[David Hildenbrand]

... and rename it to memhp_default_online_type. This is a preparation
for more detailed default online behavior.

Reviewed-by: Wei Yang <richard.weiy...@gmail.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Michal Hocko <mho...@kernel.org>
Cc: Oscar Salvador <osalva...@suse.de>
Cc: "Rafael J. Wysocki" <raf...@kernel.org>
Cc: Baoquan He <b...@redhat.com>
Cc: Wei Yang <richard.weiy...@gmail.com>
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
 drivers/base/memory.c          | 10 ++++------
 include/linux/memory_hotplug.h |  3 ++-
 mm/memory_hotplug.c            | 11 ++++++-----
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 8a7f29c0bf97..8d3e16dab69f 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -386,10 +386,8 @@ static DEVICE_ATTR_RO(block_size_bytes);
 static ssize_t auto_online_blocks_show(struct device *dev,
                                       struct device_attribute *attr, char *buf)
 {
-       if (memhp_auto_online)
-               return sprintf(buf, "online\n");
-       else
-               return sprintf(buf, "offline\n");
+       return sprintf(buf, "%s\n",
+                      online_type_to_str[memhp_default_online_type]);
 }
 
 static ssize_t auto_online_blocks_store(struct device *dev,
@@ -397,9 +395,9 @@ static ssize_t auto_online_blocks_store(struct device *dev,
                                        const char *buf, size_t count)
 {
        if (sysfs_streq(buf, "online"))
-               memhp_auto_online = true;
+               memhp_default_online_type = MMOP_ONLINE;
        else if (sysfs_streq(buf, "offline"))
-               memhp_auto_online = false;
+               memhp_default_online_type = MMOP_OFFLINE;
        else
                return -EINVAL;
 
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index c2e06ed5e0e9..c6e090b34c4b 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -117,7 +117,8 @@ extern int arch_add_memory(int nid, u64 start, u64 size,
                        struct mhp_restrictions *restrictions);
 extern u64 max_mem_size;
 
-extern bool memhp_auto_online;
+/* Default online_type (MMOP_*) when new memory blocks are added. */
+extern int memhp_default_online_type;
 /* If movable_node boot option specified */
 extern bool movable_node_enabled;
 static inline bool movable_node_is_enabled(void)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2d2aae830b92..1975a2b99a2b 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -67,17 +67,17 @@ void put_online_mems(void)
 bool movable_node_enabled = false;
 
 #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE
-bool memhp_auto_online;
+int memhp_default_online_type = MMOP_OFFLINE;
 #else
-bool memhp_auto_online = true;
+int memhp_default_online_type = MMOP_ONLINE;
 #endif
 
 static int __init setup_memhp_default_state(char *str)
 {
        if (!strcmp(str, "online"))
-               memhp_auto_online = true;
+               memhp_default_online_type = MMOP_ONLINE;
        else if (!strcmp(str, "offline"))
-               memhp_auto_online = false;
+               memhp_default_online_type = MMOP_OFFLINE;
 
        return 1;
 }
@@ -990,6 +990,7 @@ static int check_hotplug_memory_range(u64 start, u64 size)
 
 static int online_memory_block(struct memory_block *mem, void *arg)
 {
+       mem->online_type = memhp_default_online_type;
        return device_online(&mem->dev);
 }
 
@@ -1062,7 +1063,7 @@ int __ref add_memory_resource(int nid, struct resource 
*res)
        mem_hotplug_done();
 
        /* online pages if requested */
-       if (memhp_auto_online)
+       if (memhp_default_online_type != MMOP_OFFLINE)
                walk_memory_blocks(start, size, NULL, online_memory_block);
 
        return ret;
-- 
2.24.1