[Xen-devel] [PATCH v1] mm/memory_hotplug: drop "online" parameter from add_memory_resource()

[David Hildenbrand <david@xxxxxxxxxx>]

User space should always be in charge of how to online memory and
if memory should be onlined automatically in the kernel. Let's drop the
parameter to overwrite this - XEN passes memhp_auto_online, just like
add_memory(), so we can directly use that instead internally.

Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 drivers/xen/balloon.c          | 2 +-
 include/linux/memory_hotplug.h | 2 +-
 mm/memory_hotplug.c            | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 12148289debd..81ba448166cd 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -397,7 +397,7 @@ static enum bp_state reserve_additional_memory(void)
        mutex_unlock(&balloon_mutex);
        /* add_memory_resource() requires the device_hotplug lock */
        lock_device_hotplug();
-       rc = add_memory_resource(nid, resource, memhp_auto_online);
+       rc = add_memory_resource(nid, resource);
        unlock_device_hotplug();
        mutex_lock(&balloon_mutex);
 
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 84e9ae205930..ebc99f29aeae 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -326,7 +326,7 @@ extern int walk_memory_range(unsigned long start_pfn, 
unsigned long end_pfn,
                void *arg, int (*func)(struct memory_block *, void *));
 extern int __add_memory(int nid, u64 start, u64 size);
 extern int add_memory(int nid, u64 start, u64 size);
-extern int add_memory_resource(int nid, struct resource *resource, bool 
online);
+extern int add_memory_resource(int nid, struct resource *resource);
 extern int arch_add_memory(int nid, u64 start, u64 size,
                struct vmem_altmap *altmap, bool want_memblock);
 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7b4317ae8318..7b64bbf645c3 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1096,7 +1096,7 @@ static int online_memory_block(struct memory_block *mem, 
void *arg)
  *
  * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG
  */
-int __ref add_memory_resource(int nid, struct resource *res, bool online)
+int __ref add_memory_resource(int nid, struct resource *res)
 {
        u64 start, size;
        bool new_node = false;
@@ -1151,7 +1151,7 @@ int __ref add_memory_resource(int nid, struct resource 
*res, bool online)
        mem_hotplug_done();
 
        /* online pages if requested */
-       if (online)
+       if (memhp_auto_online)
                walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1),
                                  NULL, online_memory_block);
 
@@ -1175,7 +1175,7 @@ int __ref __add_memory(int nid, u64 start, u64 size)
        if (IS_ERR(res))
                return PTR_ERR(res);
 
-       ret = add_memory_resource(nid, res, memhp_auto_online);
+       ret = add_memory_resource(nid, res);
        if (ret < 0)
                release_memory_resource(res);
        return ret;
-- 
2.17.2


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