[PATCH] LoongArch: mm: avoid unnecessary page fault retires on shared memory types

From: Huacai Chen
Date: Mon Aug 15 2022 - 00:06:05 EST


Commit d92725256b4f22d0 ("mm: avoid unnecessary page fault retires on
shared memory types") modifies do_page_fault() to handle the VM_FAULT_
COMPLETED case, but forget to change for LoongArch, so fix it as other
architectures does.

Fixes: d92725256b4f22d0 ("mm: avoid unnecessary page fault retires on shared memory types")
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/mm/fault.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c
index 605579b19a00..1ccd53655cab 100644
--- a/arch/loongarch/mm/fault.c
+++ b/arch/loongarch/mm/fault.c
@@ -216,6 +216,10 @@ static void __kprobes __do_page_fault(struct pt_regs *regs,
return;
}

+ /* The fault is fully completed (including releasing mmap lock) */
+ if (fault & VM_FAULT_COMPLETED)
+ return;
+
if (unlikely(fault & VM_FAULT_RETRY)) {
flags |= FAULT_FLAG_TRIED;

--
2.31.1