[PATCH v1 4/5] 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.

Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Michal Hocko <mhocko at kernel.org>
Cc: Oscar Salvador <osalvador at suse.de>
Cc: "Rafael J. Wysocki" <rafael at kernel.org>
Cc: Baoquan He <bhe at redhat.com>
Cc: Wei Yang <richard.weiyang at gmail.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: "K. Y. Srinivasan" <kys at microsoft.com>
Cc: Haiyang Zhang <haiyangz at microsoft.com>
Cc: Stephen Hemminger <sthemmin at microsoft.com>
Cc: Wei Liu <wei.liu at kernel.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-hyperv at vger.kernel.org
Signed-off-by: David Hildenbrand <david at redhat.com>
---
 arch/powerpc/platforms/powernv/memtrace.c |  2 +-
 drivers/base/memory.c                     | 10 ++++------
 drivers/hv/hv_balloon.c                   |  2 +-
 include/linux/memory_hotplug.h            |  3 ++-
 mm/memory_hotplug.c                       | 13 +++++++------
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index d6d64f8718e6..e15a600cfa4d 100644
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -235,7 +235,7 @@ static int memtrace_online(void)
 		 * If kernel isn't compiled with the auto online option
 		 * we need to online the memory ourselves.
 		 */
-		if (!memhp_auto_online) {
+		if (memhp_default_online_type == MMOP_OFFLINE) {
 			lock_device_hotplug();
 			walk_memory_blocks(ent->start, ent->size, NULL,
 					   online_mem_block);
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/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index a02ce43d778d..3b90fd12e0c5 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -727,7 +727,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 		spin_unlock_irqrestore(&dm_device.ha_lock, flags);
 
 		init_completion(&dm_device.ol_waitevent);
-		dm_device.ha_waiting = !memhp_auto_online;
+		dm_device.ha_waiting = memhp_default_online_type == MMOP_OFFLINE;
 
 		nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
 		ret = add_memory(nid, PFN_PHYS((start_pfn)),
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 1a00b5a37ef6..01443c70aa27 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -67,18 +67,18 @@ 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
-EXPORT_SYMBOL_GPL(memhp_auto_online);
+EXPORT_SYMBOL_GPL(memhp_default_online_type);
 
 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;
 }
@@ -991,6 +991,7 @@ 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);
 }
 
@@ -1063,7 +1064,7 @@ 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