Merge branch 'slub/hotplug' into slab/urgent
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 24376fe..8122018d 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -165,6 +165,12 @@
extern void put_page_bootmem(struct page *page);
#endif
+/*
+ * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
+ * notifier will be called under this. 2) offline/online/add/remove memory
+ * will not run simultaneously.
+ */
+
void lock_memory_hotplug(void);
void unlock_memory_hotplug(void);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e92f047..321fc74 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -409,6 +409,7 @@
int ret;
struct memory_notify arg;
+ lock_memory_hotplug();
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
arg.status_change_nid = -1;
@@ -421,6 +422,7 @@
ret = notifier_to_errno(ret);
if (ret) {
memory_notify(MEM_CANCEL_ONLINE, &arg);
+ unlock_memory_hotplug();
return ret;
}
/*
@@ -445,6 +447,7 @@
printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
nr_pages, pfn);
memory_notify(MEM_CANCEL_ONLINE, &arg);
+ unlock_memory_hotplug();
return ret;
}
@@ -469,6 +472,7 @@
if (onlined_pages)
memory_notify(MEM_ONLINE, &arg);
+ unlock_memory_hotplug();
return 0;
}
diff --git a/mm/slub.c b/mm/slub.c
index c7ef007..e15aa7f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3797,7 +3797,7 @@
}
}
- down_read(&slub_lock);
+ lock_memory_hotplug();
#ifdef CONFIG_SLUB_DEBUG
if (flags & SO_ALL) {
for_each_node_state(node, N_NORMAL_MEMORY) {
@@ -3838,7 +3838,7 @@
x += sprintf(buf + x, " N%d=%lu",
node, nodes[node]);
#endif
- up_read(&slub_lock);
+ unlock_memory_hotplug();
kfree(nodes);
return x + sprintf(buf + x, "\n");
}