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Subject[PATCH v2] maple_tree: use mas_node_count_gfp on mas_expected_entries
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Use mas_node_count_gfp with GFP_KERNEL instead of 
GFP_NOWAIT | __GFP_NOWARN on mas_expected_entries
in order to allow memory reclaim.

Currently, fork errors occur on low free memory as follows:

Zygote : Failed to fork child process: Out of memory (12)

-ENOMEM was returned as following path:

mas_node_count
mas_expected_entries
dup_mmap
dup_mm
copy_mm
copy_process

Signed-off-by: Jaeseon Sim <jason.sim@samsung.com>
---
lib/maple_tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index ee1ff0c59fd7..b0229271c24e 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5574,7 +5574,7 @@ int mas_expected_entries(struct ma_state *mas, unsigned long nr_entries)
/* Internal nodes */
nr_nodes += DIV_ROUND_UP(nr_nodes, nonleaf_cap);
/* Add working room for split (2 nodes) + new parents */
- mas_node_count(mas, nr_nodes + 3);
+ mas_node_count_gfp(mas, nr_nodes + 3, GFP_KERNEL);

/* Detect if allocations run out */
mas->mas_flags |= MA_STATE_PREALLOC;
--
2.17.1
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