[PATCH v2] mm/hugetlb: use helper huge_page_size() to get hugepage size

[Miaohe Lin]

We can use helper huge_page_size() to get the hugepage size directly to
simplify the code slightly.

Reviewed-by: Mike Kravetz <mike.krav...@oracle.com>
Signed-off-by: Miaohe Lin <linmia...@huawei.com>
---
v1 -> v2
        change huge_page_size(h) >> 10 to huge_page_size(h) / SZ_1K
        collect Reviewed-by tag
---
 mm/hugetlb.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 18628f8dbfb0..06719fdf9fd6 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3199,7 +3199,7 @@ void __init hugetlb_add_hstate(unsigned int order)
        BUG_ON(order == 0);
        h = &hstates[hugetlb_max_hstate++];
        h->order = order;
-       h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1);
+       h->mask = ~(huge_page_size(h) - 1);
        for (i = 0; i < MAX_NUMNODES; ++i)
                INIT_LIST_HEAD(&h->hugepage_freelists[i]);
        INIT_LIST_HEAD(&h->hugepage_activelist);
@@ -3474,7 +3474,7 @@ void hugetlb_report_meminfo(struct seq_file *m)
        for_each_hstate(h) {
                unsigned long count = h->nr_huge_pages;
 
-               total += (PAGE_SIZE << huge_page_order(h)) * count;
+               total += huge_page_size(h) * count;
 
                if (h == &default_hstate)
                        seq_printf(m,
@@ -3487,10 +3487,10 @@ void hugetlb_report_meminfo(struct seq_file *m)
                                   h->free_huge_pages,
                                   h->resv_huge_pages,
                                   h->surplus_huge_pages,
-                                  (PAGE_SIZE << huge_page_order(h)) / 1024);
+                                  huge_page_size(h) / SZ_1K);
        }
 
-       seq_printf(m, "Hugetlb:        %8lu kB\n", total / 1024);
+       seq_printf(m, "Hugetlb:        %8lu kB\n", total / SZ_1K);
 }
 
 int hugetlb_report_node_meminfo(char *buf, int len, int nid)
@@ -3524,7 +3524,7 @@ void hugetlb_show_meminfo(void)
                                h->nr_huge_pages_node[nid],
                                h->free_huge_pages_node[nid],
                                h->surplus_huge_pages_node[nid],
-                               1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
+                               huge_page_size(h) / SZ_1K);
 }
 
 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
@@ -3647,9 +3647,7 @@ static int hugetlb_vm_op_split(struct vm_area_struct 
*vma, unsigned long addr)
 
 static unsigned long hugetlb_vm_op_pagesize(struct vm_area_struct *vma)
 {
-       struct hstate *hstate = hstate_vma(vma);
-
-       return 1UL << huge_page_shift(hstate);
+       return huge_page_size(hstate_vma(vma));
 }
 
 /*
-- 
2.19.1