[PATCH] mm/buddy: more comments for skip_free_areas_node()

[Gavin Shan <shangw@linux.vnet.ibm.com>]

The initial idea comes from Cong Wang. We're running out of memory
while calling function skip_free_areas_node(). So it would be unsafe
to allocate more memory from either stack or heap. The patche adds
more comments to address that.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 mm/page_alloc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4403009..c74f5a9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2737,6 +2737,9 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 /*
  * Determine whether the node should be displayed or not, depending on whether
  * SHOW_MEM_FILTER_NODES was passed to show_free_areas().
+ *
+ * We're running out of memory while calling the function. So don't allocate
+ * more memory from either stack or heap.
  */
 bool skip_free_areas_node(unsigned int flags, int nid)
 {
-- 
1.7.9.5

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