[merged] mm-vmstat-fix-divide-error-at-__fragmentation_index.patch removed from -mm tree

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The patch titled
     Subject: mm/vmstat: fix divide error at __fragmentation_index
has been removed from the -mm tree.  Its filename was
     mm-vmstat-fix-divide-error-at-__fragmentation_index.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Wen Yang <wen.yang99@xxxxxxxxxx>
Subject: mm/vmstat: fix divide error at __fragmentation_index

When order is -1 or too big, *1UL << order* will be 0, which will cause
divide error.  Although it seems that all callers of
__fragmentation_index() will only do so with a valid order, the patch can
make it more robust.

Should prevent reoccurrences of
https://bugzilla.kernel.org/show_bug.cgi?id=196555

Link: http://lkml.kernel.org/r/1501751520-2598-1-git-send-email-wen.yang99@xxxxxxxxxx
Signed-off-by: Wen Yang <wen.yang99@xxxxxxxxxx>
Reviewed-by: Jiang Biao <jiang.biao2@xxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/vmstat.c |    3 +++
 1 file changed, 3 insertions(+)

diff -puN mm/vmstat.c~mm-vmstat-fix-divide-error-at-__fragmentation_index mm/vmstat.c
--- a/mm/vmstat.c~mm-vmstat-fix-divide-error-at-__fragmentation_index
+++ a/mm/vmstat.c
@@ -870,6 +870,9 @@ static int __fragmentation_index(unsigne
 {
 	unsigned long requested = 1UL << order;
 
+	if (WARN_ON_ONCE(order >= MAX_ORDER))
+		return 0;
+
 	if (!info->free_blocks_total)
 		return 0;
 
_

Patches currently in -mm which might be from wen.yang99@xxxxxxxxxx are


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