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Subject[PATCH] mm: fix do_mbind return value
I noticed that numa_alloc_onnode() failed to allocate memory on a
specified node in v4.0-rc1. I added a code to check the return value
of walk_page_range() in queue_pages_range() so that do_mbind() only
returns an error number or zero.

Signed-off-by: Kazutomo Yoshii <kazutomo.yoshii@gmail.com>
---
mm/mempolicy.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4721046..ea79171 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -644,6 +644,7 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.nmask = nodes,
.prev = NULL,
};
+ int err;
struct mm_walk queue_pages_walk = {
.hugetlb_entry = queue_pages_hugetlb,
.pmd_entry = queue_pages_pte_range,
@@ -652,7 +653,10 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.private = &qp,
};
- return walk_page_range(start, end, &queue_pages_walk);
+ err = walk_page_range(start, end, &queue_pages_walk);
+ if (err < 0)
+ return err;
+ return 0;
}
/*
--
1.8.3.1


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