mm: page_alloc: remove unused parameter from reserve_highatomic_pageblock()

Just remove the redundant parameter alloc_order from
reserve_highatomic_pageblock(). No functional modification involved.

Link: https://lkml.kernel.org/r/20230809073323.1065286-1-zhangpeng362@huawei.comSigned-off-by: ZhangPeng <zhangpeng362@huawei.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/page_alloc.c

@@ -1899,8 +1899,7 @@ int find_suitable_fallback(struct free_area *area, unsigned int order,
  * Reserve a pageblock for exclusive use of high-order atomic allocations if
  * there are no empty page blocks that contain a page with a suitable order
  */
-static void reserve_highatomic_pageblock(struct page *page, struct zone *zone,
-				unsigned int alloc_order)
+static void reserve_highatomic_pageblock(struct page *page, struct zone *zone)
 {
 	int mt;
 	unsigned long max_managed, flags;
@@ -3210,7 +3209,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
 			 * if the pageblock should be reserved for the future
 			 */
 			if (unlikely(alloc_flags & ALLOC_HIGHATOMIC))
-				reserve_highatomic_pageblock(page, zone, order);
+				reserve_highatomic_pageblock(page, zone);
 
 			return page;
 		} else {