Make UART4 the default UART for kernel messages

[linux-beck.git] / mm / memory_hotplug.c

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index cad4b9125695cfbfcc7509e942f6d8f8a37f460c..ede137345a99f4bf20612112117fd79fa658863d 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1033,36 +1033,39 @@ static void node_states_set_node(int node, struct memory_notify *arg)
        node_set_state(node, N_MEMORY);
 }
 
-int zone_can_shift(unsigned long pfn, unsigned long nr_pages,
-                  enum zone_type target)
+bool zone_can_shift(unsigned long pfn, unsigned long nr_pages,
+                  enum zone_type target, int *zone_shift)
 {
        struct zone *zone = page_zone(pfn_to_page(pfn));
        enum zone_type idx = zone_idx(zone);
        int i;
 
+       *zone_shift = 0;
+
        if (idx < target) {
                /* pages must be at end of current zone */
                if (pfn + nr_pages != zone_end_pfn(zone))
-                       return 0;
+                       return false;
 
                /* no zones in use between current zone and target */
                for (i = idx + 1; i < target; i++)
                        if (zone_is_initialized(zone - idx + i))
-                               return 0;
+                               return false;
        }
 
        if (target < idx) {
                /* pages must be at beginning of current zone */
                if (pfn != zone->zone_start_pfn)
-                       return 0;
+                       return false;
 
                /* no zones in use between current zone and target */
                for (i = target + 1; i < idx; i++)
                        if (zone_is_initialized(zone - idx + i))
-                               return 0;
+                               return false;
        }
 
-       return target - idx;
+       *zone_shift = target - idx;
+       return true;
 }
 
 /* Must be protected by mem_hotplug_begin() */
@@ -1089,10 +1092,13 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
            !can_online_high_movable(zone))
                return -EINVAL;
 
-       if (online_type == MMOP_ONLINE_KERNEL)
-               zone_shift = zone_can_shift(pfn, nr_pages, ZONE_NORMAL);
-       else if (online_type == MMOP_ONLINE_MOVABLE)
-               zone_shift = zone_can_shift(pfn, nr_pages, ZONE_MOVABLE);
+       if (online_type == MMOP_ONLINE_KERNEL) {
+               if (!zone_can_shift(pfn, nr_pages, ZONE_NORMAL, &zone_shift))
+                       return -EINVAL;
+       } else if (online_type == MMOP_ONLINE_MOVABLE) {
+               if (!zone_can_shift(pfn, nr_pages, ZONE_MOVABLE, &zone_shift))
+                       return -EINVAL;
+       }
 
        zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages);
        if (!zone)
@@ -1477,17 +1483,20 @@ bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
 }
 
 /*
- * Confirm all pages in a range [start, end) is belongs to the same zone.
+ * Confirm all pages in a range [start, end) belong to the same zone.
+ * When true, return its valid [start, end).
  */
-int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
+int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
+                        unsigned long *valid_start, unsigned long *valid_end)
 {
        unsigned long pfn, sec_end_pfn;
+       unsigned long start, end;
        struct zone *zone = NULL;
        struct page *page;
        int i;
-       for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn);
+       for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1);
             pfn < end_pfn;
-            pfn = sec_end_pfn + 1, sec_end_pfn += PAGES_PER_SECTION) {
+            pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) {
                /* Make sure the memory section is present first */
                if (!present_section_nr(pfn_to_section_nr(pfn)))
                        continue;
@@ -1503,10 +1512,20 @@ int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
                        page = pfn_to_page(pfn + i);
                        if (zone && page_zone(page) != zone)
                                return 0;
+                       if (!zone)
+                               start = pfn + i;
                        zone = page_zone(page);
+                       end = pfn + MAX_ORDER_NR_PAGES;
                }
        }
-       return 1;
+
+       if (zone) {
+               *valid_start = start;
+               *valid_end = end;
+               return 1;
+       } else {
+               return 0;
+       }
 }
 
 /*
@@ -1853,6 +1872,7 @@ static int __ref __offline_pages(unsigned long start_pfn,
        long offlined_pages;
        int ret, drain, retry_max, node;
        unsigned long flags;
+       unsigned long valid_start, valid_end;
        struct zone *zone;
        struct memory_notify arg;
 
@@ -1863,10 +1883,10 @@ static int __ref __offline_pages(unsigned long start_pfn,
                return -EINVAL;
        /* This makes hotplug much easier...and readable.
           we assume this for now. .*/
-       if (!test_pages_in_a_zone(start_pfn, end_pfn))
+       if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end))
                return -EINVAL;
 
-       zone = page_zone(pfn_to_page(start_pfn));
+       zone = page_zone(pfn_to_page(valid_start));
        node = zone_to_nid(zone);
        nr_pages = end_pfn - start_pfn;