From 0a22320a3c286d20f2561aae9cccf94692a2e35b Mon Sep 17 00:00:00 2001
From: Hannes Weisbach <hannes.weisbach@riken.jp>
Date: Wed, 20 Sep 2017 10:34:49 +0900
Subject: [PATCH] Don't allocate memory for 0-page-sized requests

Previously the allocator would return all availble memory for a
request of 0 pages. This is rather counter-intuitive and left no
memory for subsequent allocations.
---
 kernel/mem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/mem.c b/kernel/mem.c
index 78671ba2..23a28b21 100644
--- a/kernel/mem.c
+++ b/kernel/mem.c
@@ -553,6 +553,9 @@ static void *mckernel_allocate_aligned_pages_node(int npages, int p2align,
 #endif
 	int numa_id;
 
+	if(npages <= 0)
+		return NULL;
+
 	/* Not yet initialized or idle process */
 	if (!cpu_local_var_initialized ||
 			!cpu_local_var(current) ||