mm, vmalloc: constify allocation mask

tmp_mask in the __vmalloc_area_node() iteration never changes so it can be
moved into function scope and marked with const.  This causes the movl and
orl to only be done once per call rather than area->nr_pages times.

nested_gfp can also be marked const.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a3cad905f56050942545254b1ba464ac577e0f50..9ec4173f48a8859ab2c6686eb7c3c18198b391ed 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1566,7 +1566,8 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
        const int order = 0;
        struct page **pages;
        unsigned int nr_pages, array_size, i;
-       gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
+       const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
+       const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
 
        nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
        array_size = (nr_pages * sizeof(struct page *));
@@ -1589,12 +1590,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 
        for (i = 0; i < area->nr_pages; i++) {
                struct page *page;
-               gfp_t tmp_mask = gfp_mask | __GFP_NOWARN;
 
                if (node == NUMA_NO_NODE)
-                       page = alloc_page(tmp_mask);
+                       page = alloc_page(alloc_mask);
                else
-                       page = alloc_pages_node(node, tmp_mask, order);
+                       page = alloc_pages_node(node, alloc_mask, order);
 
                if (unlikely(!page)) {
                        /* Successfully allocated i pages, free them in __vunmap() */