mm/hugetlb: use some helper functions to cleanup code

Patch series "Some cleanups for hugetlb".

This series contains cleanups to remove unnecessary VM_BUG_ON_PAGE, use
helper function and so on.  I also collect some previous patches into this
series in case they are forgotten.

This patch (of 5):

We could use pages_per_huge_page to get the number of pages per hugepage,
use get_hstate_idx to calculate hstate index, and use hstate_is_gigantic
to check if a hstate is gigantic to make code more succinct.

Link: https://lkml.kernel.org/r/20210308112809.26107-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20210308112809.26107-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 701c82c..c262566 100644 (file)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1435,7 +1435,7 @@ static int get_hstate_idx(int page_size_log)
 
        if (!h)
                return -1;
-       return h - hstates;
+       return hstate_index(h);
 }
 
 /*

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c0d4c77..87104dc 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1273,7 +1273,7 @@ static void free_gigantic_page(struct page *page, unsigned int order)
 static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
                int nid, nodemask_t *nodemask)
 {
-       unsigned long nr_pages = 1UL << huge_page_order(h);
+       unsigned long nr_pages = pages_per_huge_page(h);
        if (nid == NUMA_NO_NODE)
                nid = numa_mem_id();
 
@@ -3267,10 +3267,10 @@ static int __init hugepages_setup(char *s)
 
        /*
         * Global state is always initialized later in hugetlb_init.
-        * But we need to allocate >= MAX_ORDER hstates here early to still
+        * But we need to allocate gigantic hstates here early to still
         * use the bootmem allocator.
         */
-       if (hugetlb_max_hstate && parsed_hstate->order >= MAX_ORDER)
+       if (hugetlb_max_hstate && hstate_is_gigantic(parsed_hstate))
                hugetlb_hstate_alloc_pages(parsed_hstate);
 
        last_mhp = mhp;