hugetlb: fix an error code in hugetlb_reserve_pages()

[ Upstream commit 7fc2513aa237e2ce239ab54d7b04d1d79b317110 ]

Preserve the error code from region_add() instead of returning success.

Link: https://lkml.kernel.org/r/X9NGZWnZl5/Mt99R@mwanda
Fixes: 0db9d74ed884 ("hugetlb: disable region_add file_region coalescing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d029d93..3b38ea9 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5115,6 +5115,7 @@ int hugetlb_reserve_pages(struct inode *inode,
 
                if (unlikely(add < 0)) {
                        hugetlb_acct_memory(h, -gbl_reserve);
+                       ret = add;
                        goto out_put_pages;
                } else if (unlikely(chg > add)) {
                        /*