[v3 4/9] mm: do not zero vmemmap_buf

Pavel Tatashin
2017-05-05T17:03:11Z

alloc_block_buf() can either use external allocator by calling
vmemmap_alloc_block() or when available use pre-allocated vmemmap_buf
to do allocation. In either case, alloc_block_buf() knows when to zero
memory based on the "zero" argument. This is why it is not needed to
zero vmemmap_buf beforehand. Let clients of alloc_block_buf() to
decide whether that is needed.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
---
mm/sparse-vmemmap.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 5d255b0..1e9508b 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -305,7 +305,7 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,

size = ALIGN(size, PMD_SIZE);
vmemmap_buf_start = __earlyonly_bootmem_alloc(nodeid, size
- * map_count, PMD_SIZE, __pa(MAX_DMA_ADDRESS), true);
+ * map_count, PMD_SIZE, __pa(MAX_DMA_ADDRESS), false);

if (vmemmap_buf_start) {
vmemmap_buf = vmemmap_buf_start;
--
1.7.1