From 7686762d1ed092db4d120e29b565712c969dc075 Mon Sep 17 00:00:00 2001
From: Sven Schnelle <svens@linux.ibm.com>
Date: Thu, 13 Jul 2023 15:54:23 +0200
Subject: [PATCH] s390/mm: fix per vma lock fault handling
With per-vma locks, handle_mm_fault() may return non-fatal error
flags. In this case the code should reset the fault flags before
returning.
Fixes: e06f47a16573 ("s390/mm: try VMA lock-based page fault handling first")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
arch/s390/mm/fault.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index dbe8394234e2b..2f123429a291b 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -421,6 +421,8 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access)
vma_end_read(vma);
if (!(fault & VM_FAULT_RETRY)) {
count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
+ if (likely(!(fault & VM_FAULT_ERROR)))
+ fault = 0;
goto out;
}
count_vm_vma_lock_event(VMA_LOCK_RETRY);
--
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