[patch 069/166] mm/memory_hotplug: convert memhp_auto_online to store an online_type

Andrew Morton
2020-04-07T03:07:43Z

From: David Hildenbrand <david@redhat.com>
Subject: mm/memory_hotplug: convert memhp_auto_online to store an online_type

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

Link: http://lkml.kernel.org/r/20200317104942.11178-8-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Yumei Huang <yuhuang@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

drivers/base/memory.c | 10 ++++------
include/linux/memory_hotplug.h | 3 ++-
mm/memory_hotplug.c | 11 ++++++-----
3 files changed, 12 insertions(+), 12 deletions(-)

--- a/drivers/base/memory.c~mm-memory_hotplug-convert-memhp_auto_online-to-store-an-online_type
+++ a/drivers/base/memory.c
@@ -378,10 +378,8 @@ 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,
@@ -389,9 +387,9 @@ static ssize_t auto_online_blocks_store(
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;

--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-convert-memhp_auto_online-to-store-an-online_type
+++ a/include/linux/memory_hotplug.h
@@ -117,7 +117,8 @@ extern int arch_add_memory(int nid, u64
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)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-convert-memhp_auto_online-to-store-an-online_type
+++ a/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(u6

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, s
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;
_