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s390/mm: fix per vma lock fault handling

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[ Upstream commit 7686762d1e ]

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: e06f47a165 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sven Schnelle 2023-07-13 15:54:23 +02:00 committed by Greg Kroah-Hartman
parent f1c7a77633
commit aa52a654da
1 changed files with 2 additions and 0 deletions
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2
arch/s390/mm/fault.c
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@ -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);