From f2057b4266a6be469ea0630971cf3cd933e42cce Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Wed, 22 Jul 2020 11:45:56 +0200
Subject: [PATCH] s390/vmemmap: fallback to PTEs if mapping large PMD fails

Let's fallback to single pages if short on huge pages. No need to stop
memory hotplug.

Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20200722094558.9828-8-david@redhat.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 arch/s390/mm/vmem.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index b831f9f9130a..e82a63de19db 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -180,10 +180,10 @@ static int __ref modify_pmd_table(pud_t *pud, unsigned long addr,
 				 */
 				new_page = vmemmap_alloc_block(PMD_SIZE,
 							       NUMA_NO_NODE);
-				if (!new_page)
-					goto out;
-				pmd_val(*pmd) = __pa(new_page) | prot;
-				continue;
+				if (new_page) {
+					pmd_val(*pmd) = __pa(new_page) | prot;
+					continue;
+				}
 			}
 			pte = vmem_pte_alloc();
 			if (!pte)