linux-kernel - [PATCH v2 7/9] s390/vmemmap: fallback to PTEs if mapping large PMD fails

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Date:   Wed, 22 Jul 2020 11:45:56 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-s390@...r.kernel.org, linux-mm@...ck.org,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: [PATCH v2 7/9] 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: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
Signed-off-by: David Hildenbrand <david@...hat.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 b831f9f9130aa..e82a63de19db2 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)
-- 
2.26.2