hugetlb: ensure hugepage access is denied if hugepages are not supported

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

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2461929..c82290b 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1981,11 +1981,7 @@ static int __init hugetlb_init(void)
 {
        int i;
 
-       /* 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)) {
@@ -2112,6 +2108,9 @@ 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)
@@ -2165,6 +2164,9 @@ 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)
@@ -2190,6 +2192,8 @@ 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"
@@ -2206,6 +2210,8 @@ 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"
@@ -2220,6 +2226,9 @@ void hugetlb_show_meminfo(void)
        struct hstate *h;
        int nid;
 
+       if (!hugepages_supported())
+               return;
+
        for_each_node_state(nid, N_MEMORY)
                for_each_hstate(h)
                        pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",