mm: use zone_end_pfn() instead of zone_start_pfn+spanned_pages

Use "zone_end_pfn()" instead of "zone->zone_start_pfn + zone->spanned_pages".
Simplify the code, no functional change.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 349587b..358a146 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -352,7 +352,7 @@ static int create_mem_extents(struct list_head *list, gfp_t gfp_mask)
                struct mem_extent *ext, *cur, *aux;
 
                zone_start = zone->zone_start_pfn;
-               zone_end = zone->zone_start_pfn + zone->spanned_pages;
+               zone_end = zone_end_pfn(zone);
 
                list_for_each_entry(ext, list, hook)
                        if (zone_start <= ext->end)
@@ -884,7 +884,7 @@ static unsigned int count_highmem_pages(void)
                        continue;
 
                mark_free_pages(zone);
-               max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+               max_zone_pfn = zone_end_pfn(zone);
                for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
                        if (saveable_highmem_page(zone, pfn))
                                n++;
@@ -948,7 +948,7 @@ static unsigned int count_data_pages(void)
                        continue;
 
                mark_free_pages(zone);
-               max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+               max_zone_pfn = zone_end_pfn(zone);
                for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
                        if (saveable_page(zone, pfn))
                                n++;
@@ -1041,7 +1041,7 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
                unsigned long max_zone_pfn;
 
                mark_free_pages(zone);
-               max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+               max_zone_pfn = zone_end_pfn(zone);
                for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
                        if (page_is_saveable(zone, pfn))
                                memory_bm_set_bit(orig_bm, pfn);
@@ -1093,7 +1093,7 @@ void swsusp_free(void)
        unsigned long pfn, max_zone_pfn;
 
        for_each_populated_zone(zone) {
-               max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+               max_zone_pfn = zone_end_pfn(zone);
                for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
                        if (pfn_valid(pfn)) {
                                struct page *page = pfn_to_page(pfn);
@@ -1755,7 +1755,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
 
        /* Clear page flags */
        for_each_populated_zone(zone) {
-               max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+               max_zone_pfn = zone_end_pfn(zone);
                for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
                        if (pfn_valid(pfn))
                                swsusp_unset_page_free(pfn_to_page(pfn));

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 8e333f9..9eadad6 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -229,7 +229,7 @@ static void grow_zone_span(struct zone *zone, unsigned long start_pfn,
 
        zone_span_writelock(zone);
 
-       old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
+       old_zone_end_pfn = zone_end_pfn(zone);
        if (!zone->spanned_pages || start_pfn < zone->zone_start_pfn)
                zone->zone_start_pfn = start_pfn;
 
@@ -514,8 +514,9 @@ static int find_biggest_section_pfn(int nid, struct zone *zone,
 static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
                             unsigned long end_pfn)
 {
-       unsigned long zone_start_pfn =  zone->zone_start_pfn;
-       unsigned long zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
+       unsigned long zone_start_pfn = zone->zone_start_pfn;
+       unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */
+       unsigned long zone_end_pfn = z;
        unsigned long pfn;
        struct mem_section *ms;
        int nid = zone_to_nid(zone);