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

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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>
This commit is contained in:
Mel Gorman 2014-06-04 16:10:21 -07:00 committed by Linus Torvalds
parent cfc47a2803
commit 7aeb09f910
2 changed files with 27 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/mmzone.h
View File

@ -817,10 +817,10 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat)
extern struct mutex zonelists_mutex;
void build_all_zonelists(pg_data_t *pgdat, struct zone *zone);
void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx);
bool zone_watermark_ok(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags);
bool zone_watermark_ok_safe(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags);
bool zone_watermark_ok(struct zone *z, unsigned 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);
enum memmap_context {
MEMMAP_EARLY,
MEMMAP_HOTPLUG,

43
mm/page_alloc.c
View File

@ -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++) {