mm: page_alloc: use unsigned int for order in more places

X86 prefers the use of unsigned types for iterators and there is a
tendency to mix whether a signed or unsigned type if used for page order.
This converts a number of sites in mm/page_alloc.c to use unsigned int for
order where possible.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 20 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce4d3716214c..37ef1b87f1f3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -409,7 +409,8 @@ static int destroy_compound_page(struct page *page, unsigned long order)
         return bad;
 }
 
-static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
+static inline void prep_zero_page(struct page *page, unsigned int order,
+                                                        gfp_t gfp_flags)
 {
         int i;
 
@@ -453,7 +454,7 @@ static inline void set_page_guard_flag(struct page *page) { }
 static inline void clear_page_guard_flag(struct page *page) { }
 #endif
 
-static inline void set_page_order(struct page *page, int order)
+static inline void set_page_order(struct page *page, unsigned int order)
 {
         set_page_private(page, order);
         __SetPageBuddy(page);
@@ -504,7 +505,7 @@ __find_buddy_index(unsigned long page_idx, unsigned int order)
  * For recording page's order, we use page_private(page).
  */
 static inline int page_is_buddy(struct page *page, struct page *buddy,
-                                                                int order)
+                                                        unsigned int order)
 {
         if (!pfn_valid_within(page_to_pfn(buddy)))
                 return 0;
@@ -726,7 +727,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 
 static void free_one_page(struct zone *zone,
                                 struct page *page, unsigned long pfn,
-                                int order,
+                                unsigned int order,
                                 int migratetype)
 {
         spin_lock(&zone->lock);
@@ -897,7 +898,7 @@ static inline int check_new_page(struct page *page)
         return 0;
 }
 
-static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
+static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags)
 {
         int i;
 
@@ -1108,16 +1109,17 @@ static int try_to_steal_freepages(struct zone *zone, struct page *page,
 
 /* Remove an element from the buddy allocator from the fallback list */
 static inline struct page *
-__rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
+__rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype)
 {
         struct free_area *area;
-        int current_order;
+        unsigned int current_order;
         struct page *page;
         int migratetype, new_type, i;
 
         /* Find the largest possible block of pages in the other list */
-        for (current_order = MAX_ORDER-1; current_order >= order;
-                                                --current_order) {
+        for (current_order = MAX_ORDER-1;
+                                current_order >= order && current_order <= MAX_ORDER-1;
+                                --current_order) {
                 for (i = 0;; i++) {
                         migratetype = fallbacks[start_migratetype][i];
 
@@ -1345,7 +1347,7 @@ void mark_free_pages(struct zone *zone)
 {
         unsigned long pfn, max_zone_pfn;
         unsigned long flags;
-        int order, t;
+        unsigned int order, t;
         struct list_head *curr;
 
         if (zone_is_empty(zone))
@@ -1541,8 +1543,8 @@ int split_free_page(struct page *page)
  */
 static inline
 struct page *buffered_rmqueue(struct zone *preferred_zone,
-                        struct zone *zone, int order, gfp_t gfp_flags,
-                        int migratetype)
+                        struct zone *zone, unsigned int order,
+                        gfp_t gfp_flags, int migratetype)
 {
         unsigned long flags;
         struct page *page;
@@ -1691,8 +1693,9 @@ static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
  * Return true if free pages are above 'mark'. This takes into account the order
  * of the allocation.
  */
-static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
-                      int classzone_idx, int alloc_flags, long free_pages)
+static bool __zone_watermark_ok(struct zone *z, unsigned int order,
+                        unsigned long mark, int classzone_idx, int alloc_flags,
+                        long free_pages)
 {
         /* free_pages my go negative - that's OK */
         long min = mark;
@@ -1726,15 +1729,15 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
         return true;
 }
 
-bool zone_watermark_ok(struct zone *z, int order, unsigned long mark,
+bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
                       int classzone_idx, int alloc_flags)
 {
         return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags,
                                         zone_page_state(z, NR_FREE_PAGES));
 }
 
-bool zone_watermark_ok_safe(struct zone *z, int order, unsigned long mark,
-                      int classzone_idx, int alloc_flags)
+bool zone_watermark_ok_safe(struct zone *z, unsigned int order,
+                        unsigned long mark, int classzone_idx, int alloc_flags)
 {
         long free_pages = zone_page_state(z, NR_FREE_PAGES);
 
@@ -4121,7 +4124,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
 
 static void __meminit zone_init_free_lists(struct zone *zone)
 {
-        int order, t;
+        unsigned int order, t;
         for_each_migratetype_order(order, t) {
                 INIT_LIST_HEAD(&zone->free_area[order].free_list[t]);
                 zone->free_area[order].nr_free = 0;
@@ -6444,7 +6447,7 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
 {
         struct page *page;
         struct zone *zone;
-        int order, i;
+        unsigned int order, i;
         unsigned long pfn;
         unsigned long flags;
         /* find the first valid pfn */
@@ -6496,7 +6499,7 @@ bool is_free_buddy_page(struct page *page)
         struct zone *zone = page_zone(page);
         unsigned long pfn = page_to_pfn(page);
         unsigned long flags;
-        int order;
+        unsigned int order;
 
         spin_lock_irqsave(&zone->lock, flags);
         for (order = 0; order < MAX_ORDER; order++) {