linux-kernel - [PATCH] maple_tree: use GFP_KERNEL on mas_node

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Message-ID: <20230907033914epcms1p61c5eed4d34d5c4212436c201f33292b3@epcms1p6>
Date:   Thu, 07 Sep 2023 12:39:14 +0900
From:   심재선 <jason.sim@...sung.com>
To:     "liam.howlett@...cle.com" <liam.howlett@...cle.com>
CC:     "surenb@...gle.com" <surenb@...gle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jaewon31.kim@...il.com" <jaewon31.kim@...il.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>
Subject: [PATCH] maple_tree: use GFP_KERNEL on mas_node_count

Use GFP_KERNEL on mas_node_count instead of GFP_NOWAIT | __GFP_NOWARN
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: jason.sim <jason.sim@...sung.com>
---
 lib/maple_tree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index ee1ff0c59fd7..076798f83baa 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -1336,11 +1336,11 @@ static void mas_node_count_gfp(struct ma_state *mas, int count, gfp_t gfp)
  * @mas: The maple state
  * @count: The number of nodes needed
  *
- * Note: Uses GFP_NOWAIT | __GFP_NOWARN for gfp flags.
+ * Note: Uses GFP_KERNEL for gfp flags.
  */
 static void mas_node_count(struct ma_state *mas, int count)
 {
-       return mas_node_count_gfp(mas, count, GFP_NOWAIT | __GFP_NOWARN);
+       return mas_node_count_gfp(mas, count, GFP_KERNEL);
 }
 
 /*
-- 
2.17.1