mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER

commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive.  This has caused
issues with code that was not yet upstream and depended on the previous
definition.

To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.

Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 11 insertions, 11 deletions

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 2830eef2b16c..89dc29f1e6c6 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1455,7 +1455,7 @@ static inline void setup_usemap(struct zone *zone) {}
 /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */
 void __init set_pageblock_order(void)
 {
-	unsigned int order = MAX_ORDER;
+	unsigned int order = MAX_PAGE_ORDER;
 
 	/* Check that pageblock_nr_pages has not already been setup */
 	if (pageblock_order)
@@ -1638,7 +1638,7 @@ static void __init alloc_node_mem_map(struct pglist_data *pgdat)
 	start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
 	offset = pgdat->node_start_pfn - start;
 	/*
-	 * The zone's endpoints aren't required to be MAX_ORDER
+		 * The zone's endpoints aren't required to be MAX_PAGE_ORDER
 	 * aligned but the node_mem_map endpoints must be in order
 	 * for the buddy allocator to function correctly.
 	 */
@@ -1964,11 +1964,11 @@ static void __init deferred_free_range(unsigned long pfn,
 	if (nr_pages == MAX_ORDER_NR_PAGES && IS_MAX_ORDER_ALIGNED(pfn)) {
 		for (i = 0; i < nr_pages; i += pageblock_nr_pages)
 			set_pageblock_migratetype(page + i, MIGRATE_MOVABLE);
-		__free_pages_core(page, MAX_ORDER);
+		__free_pages_core(page, MAX_PAGE_ORDER);
 		return;
 	}
 
-	/* Accept chunks smaller than MAX_ORDER upfront */
+	/* Accept chunks smaller than MAX_PAGE_ORDER upfront */
 	accept_memory(PFN_PHYS(pfn), PFN_PHYS(pfn + nr_pages));
 
 	for (i = 0; i < nr_pages; i++, page++, pfn++) {
@@ -1991,8 +1991,8 @@ static inline void __init pgdat_init_report_one_done(void)
 /*
  * Returns true if page needs to be initialized or freed to buddy allocator.
  *
- * We check if a current MAX_ORDER block is valid by only checking the validity
- * of the head pfn.
+ * We check if a current MAX_PAGE_ORDER block is valid by only checking the
+ * validity of the head pfn.
  */
 static inline bool __init deferred_pfn_valid(unsigned long pfn)
 {
@@ -2149,8 +2149,8 @@ deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn,
 	deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, start_pfn);
 
 	/*
-	 * Initialize and free pages in MAX_ORDER sized increments so that we
-	 * can avoid introducing any issues with the buddy allocator.
+	 * Initialize and free pages in MAX_PAGE_ORDER sized increments so that
+	 * we can avoid introducing any issues with the buddy allocator.
 	 */
 	while (spfn < end_pfn) {
 		deferred_init_maxorder(&i, zone, &spfn, &epfn);
@@ -2291,7 +2291,7 @@ bool __init deferred_grow_zone(struct zone *zone, unsigned int order)
 	}
 
 	/*
-	 * Initialize and free pages in MAX_ORDER sized increments so
+	 * Initialize and free pages in MAX_PAGE_ORDER sized increments so
 	 * that we can avoid introducing any issues with the buddy
 	 * allocator.
 	 */
@@ -2509,7 +2509,7 @@ void *__init alloc_large_system_hash(const char *tablename,
 			else
 				table = memblock_alloc_raw(size,
 							   SMP_CACHE_BYTES);
-		} else if (get_order(size) > MAX_ORDER || hashdist) {
+		} else if (get_order(size) > MAX_PAGE_ORDER || hashdist) {
 			table = vmalloc_huge(size, gfp_flags);
 			virt = true;
 			if (table)
@@ -2756,7 +2756,7 @@ void __init mm_core_init(void)
 
 	/*
 	 * page_ext requires contiguous pages,
-	 * bigger than MAX_ORDER unless SPARSEMEM.
+	 * bigger than MAX_PAGE_ORDER unless SPARSEMEM.
 	 */
 	page_ext_init_flatmem();
 	mem_debugging_and_hardening_init();