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-rw-r--r--mm/memblock.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index d5681008dce1..6a2a48a122a9 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -39,6 +39,9 @@ struct memblock memblock __initdata_memblock = {
};
int memblock_debug __initdata_memblock;
+#ifdef CONFIG_MOVABLE_NODE
+bool movable_node_enabled __initdata_memblock = false;
+#endif
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
static int memblock_reserved_in_slab __initdata_memblock = 0;
@@ -820,6 +823,11 @@ void __init_memblock __next_free_mem_range(u64 *idx, int nid,
* @out_nid: ptr to int for nid of the range, can be %NULL
*
* Reverse of __next_free_mem_range().
+ *
+ * Linux kernel cannot migrate pages used by itself. Memory hotplug users won't
+ * be able to hot-remove hotpluggable memory used by the kernel. So this
+ * function skip hotpluggable regions if needed when allocating memory for the
+ * kernel.
*/
void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
phys_addr_t *out_start,
@@ -844,6 +852,10 @@ void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;
+ /* skip hotpluggable memory regions if needed */
+ if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
+ continue;
+
/* scan areas before each reservation for intersection */
for ( ; ri >= 0; ri--) {
struct memblock_region *r = &rsv->regions[ri];