linux-kernel - [PATCH v2] mm: use update_mmu

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Message-Id: <20220926115621.13849-1-zhengqi.arch@bytedance.com>
Date:   Mon, 26 Sep 2022 19:56:21 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, muchun.song@...ux.dev, david@...hat.com
Cc:     chris@...kel.net, jcmvbkbc@...il.com, maobibo@...ngson.cn,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v2] mm: use update_mmu_tlb() on the second thread

As message in commit 7df676974359 ("mm/memory.c: Update local TLB
if PTE entry exists") said, we should update local TLB only on the
second thread. So in the do_anonymous_page() here, we should use
update_mmu_tlb() instead of update_mmu_cache() on the second thread.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
---
v1: https://lore.kernel.org/lkml/20220924053239.91661-1-zhengqi.arch@bytedance.com/

Changelog in v1 -> v2:
 - change the subject and commit message (David)

 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index 118e5f023597..9e11c783ba0e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4122,7 +4122,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address,
 			&vmf->ptl);
 	if (!pte_none(*vmf->pte)) {
-		update_mmu_cache(vma, vmf->address, vmf->pte);
+		update_mmu_tlb(vma, vmf->address, vmf->pte);
 		goto release;
 	}
 
-- 
2.20.1