Merge branch 'stable-3.2' into pandora-3.2

[pandora-kernel.git] / mm / hugetlb.c

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9256590..031f036 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -633,6 +633,7 @@ static void free_huge_page(struct page *page)
                h->surplus_huge_pages--;
                h->surplus_huge_pages_node[nid]--;
        } else {
+               arch_clear_hugepage_flags(page);
                enqueue_huge_page(h, page);
        }
        spin_unlock(&hugetlb_lock);
@@ -1417,6 +1418,10 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
                 * and reducing the surplus.
                 */
                spin_unlock(&hugetlb_lock);
+
+               /* yield cpu to avoid soft lockup */
+               cond_resched();
+
                ret = alloc_fresh_huge_page(h, nodes_allowed);
                spin_lock(&hugetlb_lock);
                if (!ret)
@@ -1713,9 +1718,9 @@ static void __init hugetlb_sysfs_init(void)
 
 /*
  * node_hstate/s - associate per node hstate attributes, via their kobjects,
- * with node sysdevs in node_devices[] using a parallel array.  The array
- * index of a node sysdev or _hstate == node id.
- * This is here to avoid any static dependency of the node sysdev driver, in
+ * with node devices in node_devices[] using a parallel array.  The array
+ * index of a node device or _hstate == node id.
+ * This is here to avoid any static dependency of the node device driver, in
  * the base kernel, on the hugetlb module.
  */
 struct node_hstate {
@@ -1725,7 +1730,7 @@ struct node_hstate {
 struct node_hstate node_hstates[MAX_NUMNODES];
 
 /*
- * A subset of global hstate attributes for node sysdevs
+ * A subset of global hstate attributes for node devices
  */
 static struct attribute *per_node_hstate_attrs[] = {
        &nr_hugepages_attr.attr,
@@ -1739,7 +1744,7 @@ static struct attribute_group per_node_hstate_attr_group = {
 };
 
 /*
- * kobj_to_node_hstate - lookup global hstate for node sysdev hstate attr kobj.
+ * kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj.
  * Returns node id via non-NULL nidp.
  */
 static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
@@ -1762,13 +1767,13 @@ static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
 }
 
 /*
- * Unregister hstate attributes from a single node sysdev.
+ * Unregister hstate attributes from a single node device.
  * No-op if no hstate attributes attached.
  */
 void hugetlb_unregister_node(struct node *node)
 {
        struct hstate *h;
-       struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+       struct node_hstate *nhs = &node_hstates[node->dev.id];
 
        if (!nhs->hugepages_kobj)
                return;         /* no hstate attributes */
@@ -1784,7 +1789,7 @@ void hugetlb_unregister_node(struct node *node)
 }
 
 /*
- * hugetlb module exit:  unregister hstate attributes from node sysdevs
+ * hugetlb module exit:  unregister hstate attributes from node devices
  * that have them.
  */
 static void hugetlb_unregister_all_nodes(void)
@@ -1792,7 +1797,7 @@ static void hugetlb_unregister_all_nodes(void)
        int nid;
 
        /*
-        * disable node sysdev registrations.
+        * disable node device registrations.
         */
        register_hugetlbfs_with_node(NULL, NULL);
 
@@ -1804,20 +1809,20 @@ static void hugetlb_unregister_all_nodes(void)
 }
 
 /*
- * Register hstate attributes for a single node sysdev.
+ * Register hstate attributes for a single node device.
  * No-op if attributes already registered.
  */
 void hugetlb_register_node(struct node *node)
 {
        struct hstate *h;
-       struct node_hstate *nhs = &node_hstates[node->sysdev.id];
+       struct node_hstate *nhs = &node_hstates[node->dev.id];
        int err;
 
        if (nhs->hugepages_kobj)
                return;         /* already allocated */
 
        nhs->hugepages_kobj = kobject_create_and_add("hugepages",
-                                                       &node->sysdev.kobj);
+                                                       &node->dev.kobj);
        if (!nhs->hugepages_kobj)
                return;
 
@@ -1828,7 +1833,7 @@ void hugetlb_register_node(struct node *node)
                if (err) {
                        printk(KERN_ERR "Hugetlb: Unable to add hstate %s"
                                        " for node %d\n",
-                                               h->name, node->sysdev.id);
+                                               h->name, node->dev.id);
                        hugetlb_unregister_node(node);
                        break;
                }
@@ -1837,8 +1842,8 @@ void hugetlb_register_node(struct node *node)
 
 /*
  * hugetlb init time:  register hstate attributes for all registered node
- * sysdevs of nodes that have memory.  All on-line nodes should have
- * registered their associated sysdev by this time.
+ * devices of nodes that have memory.  All on-line nodes should have
+ * registered their associated device by this time.
  */
 static void hugetlb_register_all_nodes(void)
 {
@@ -1846,12 +1851,12 @@ static void hugetlb_register_all_nodes(void)
 
        for_each_node_state(nid, N_HIGH_MEMORY) {
                struct node *node = &node_devices[nid];
-               if (node->sysdev.id == nid)
+               if (node->dev.id == nid)
                        hugetlb_register_node(node);
        }
 
        /*
-        * Let the node sysdev driver know we're here so it can
+        * Let the node device driver know we're here so it can
         * [un]register hstate attributes on node hotplug.
         */
        register_hugetlbfs_with_node(hugetlb_register_node,
@@ -1889,11 +1894,7 @@ module_exit(hugetlb_exit);
 
 static int __init hugetlb_init(void)
 {
-       /* Some platform decide whether they support huge pages at boot
-        * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
-        * there is no such support
-        */
-       if (HPAGE_SHIFT == 0)
+       if (!hugepages_supported())
                return 0;
 
        if (!size_to_hstate(default_hstate_size)) {
@@ -2010,6 +2011,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
        unsigned long tmp;
        int ret;
 
+       if (!hugepages_supported())
+               return -ENOTSUPP;
+
        tmp = h->max_huge_pages;
 
        if (write && h->order >= MAX_ORDER)
@@ -2075,6 +2079,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
        unsigned long tmp;
        int ret;
 
+       if (!hugepages_supported())
+               return -ENOTSUPP;
+
        tmp = h->nr_overcommit_huge_pages;
 
        if (write && h->order >= MAX_ORDER)
@@ -2100,6 +2107,8 @@ out:
 void hugetlb_report_meminfo(struct seq_file *m)
 {
        struct hstate *h = &default_hstate;
+       if (!hugepages_supported())
+               return;
        seq_printf(m,
                        "HugePages_Total:   %5lu\n"
                        "HugePages_Free:    %5lu\n"
@@ -2116,6 +2125,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
 int hugetlb_report_node_meminfo(int nid, char *buf)
 {
        struct hstate *h = &default_hstate;
+       if (!hugepages_supported())
+               return 0;
        return sprintf(buf,
                "Node %d HugePages_Total: %5u\n"
                "Node %d HugePages_Free:  %5u\n"