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 908f01d..031f036 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1418,6 +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)
@@ -1890,11 +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)) {
@@ -2011,6 +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)
@@ -2076,6 +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)
@@ -2101,6 +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"
@@ -2117,6 +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"