[Part2 PATCH v4 13/15] x86, memblock, mem-hotplug: Free hotpluggable memory reserved by memblock.

[Tang Chen]

We reserved hotpluggable memory in memblock. And when memory initialization
is done, we have to free it to buddy system.

This patch free memory reserved by memblock with flag MEMBLK_HOTPLUGGABLE.

Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Reviewed-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
 include/linux/memblock.h |    1 +
 mm/memblock.c            |   17 +++++++++++++++++
 mm/nobootmem.c           |    3 +++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index ce315b2..d113175 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -66,6 +66,7 @@ int memblock_reserve(phys_addr_t base, phys_addr_t size);
 int memblock_reserve_node(phys_addr_t base, phys_addr_t size, int nid);
 int memblock_reserve_local_node(phys_addr_t base, phys_addr_t size, int nid);
 int memblock_reserve_hotpluggable(phys_addr_t base, phys_addr_t size, int nid);
+void memblock_free_hotpluggable(void);
 void memblock_trim_memory(phys_addr_t align);
 void memblock_mark_kernel_nodes(void);
 bool memblock_is_kernel_node(int nid);
diff --git a/mm/memblock.c b/mm/memblock.c
index 51f0264..9df0b5f 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -568,6 +568,23 @@ int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
 	return __memblock_remove(&memblock.reserved, base, size);
 }
 
+static void __init_memblock memblock_free_flags(unsigned long flags)
+{
+	int i;
+	struct memblock_type *reserved = &memblock.reserved;
+
+	for (i = 0; i < reserved->cnt; i++) {
+		if (reserved->regions[i].flags == flags)
+			memblock_remove_region(reserved, i);
+	}
+}
+
+void __init_memblock memblock_free_hotpluggable()
+{
+	memblock_dbg("memblock: free all hotpluggable memory");
+	memblock_free_flags(MEMBLK_HOTPLUGGABLE);
+}
+
 static int __init_memblock memblock_reserve_region(phys_addr_t base,
 						   phys_addr_t size,
 						   int nid,
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index bdd3fa2..dbfbcb9 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -165,6 +165,9 @@ unsigned long __init free_all_bootmem(void)
 	for_each_online_pgdat(pgdat)
 		reset_node_lowmem_managed_pages(pgdat);
 
+	/* Hotpluggable memory reserved by memblock should also be freed. */
+	memblock_free_hotpluggable();
+
 	/*
 	 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
 	 *  because in some case like Node0 doesn't have RAM installed
-- 
1.7.1

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