mm: free memblock.memory in free_all_bootmem

When calling free_all_bootmem() the free areas under memblock's control
are released to the buddy allocator.  Additionally the reserved list is
freed if it was reallocated by memblock.  The same should apply for the
memory list.

Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 25 insertions, 1 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index 1c2ef2c7edab..64ed2439cf75 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -291,6 +291,22 @@ phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
                           memblock.reserved.max);
 }
 
+#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+
+phys_addr_t __init_memblock get_allocated_memblock_memory_regions_info(
+                                        phys_addr_t *addr)
+{
+        if (memblock.memory.regions == memblock_memory_init_regions)
+                return 0;
+
+        *addr = __pa(memblock.memory.regions);
+
+        return PAGE_ALIGN(sizeof(struct memblock_region) *
+                          memblock.memory.max);
+}
+
+#endif
+
 /**
  * memblock_double_array - double the size of the memblock regions array
  * @type: memblock type of the regions array being doubled
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index bb1a70cc97a7..17c89023184f 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -122,11 +122,19 @@ static unsigned long __init free_low_memory_core_early(void)
         for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
                 count += __free_memory_core(start, end);
 
-        /* free range that is used for reserved array if we allocate it */
+        /* Free memblock.reserved array if it was allocated */
         size = get_allocated_memblock_reserved_regions_info(&start);
         if (size)
                 count += __free_memory_core(start, start + size);
 
+#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
+
+        /* Free memblock.memory array if it was allocated */
+        size = get_allocated_memblock_memory_regions_info(&start);
+        if (size)
+                count += __free_memory_core(start, start + size);
+#endif
+
         return count;
 }