+ mm-use-update_mmu_tlb-on-the-second-thread.patch added to mm-unstable branch

+ mm-use-update_mmu_tlb-on-the-second-thread.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: use update_mmu_tlb() on the second thread
has been added to the -mm mm-unstable branch.  Its filename is
     mm-use-update_mmu_tlb-on-the-second-thread.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-use-update_mmu_tlb-on-the-second-thread.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Qi Zheng <zhengqi.arch@bytedance.com>
Subject: mm: use update_mmu_tlb() on the second thread
Date: Thu, 29 Sep 2022 19:23:17 +0800

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.

Link: https://lkml.kernel.org/r/20220929112318.32393-2-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Chris Zankel <chris@zankel.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huacai Chen <chenhuacai@loongson.cn>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/memory.c~mm-use-update_mmu_tlb-on-the-second-thread
+++ a/mm/memory.c
@@ -4136,7 +4136,7 @@ static vm_fault_t do_anonymous_page(stru
 	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;
 	}
 
_

Patches currently in -mm which might be from zhengqi.arch@bytedance.com are

mm-introduce-common-struct-mm_slot.patch
mm-thp-convert-to-use-common-struct-mm_slot.patch
ksm-remove-redundant-declarations-in-ksmh.patch
ksm-add-the-ksm-prefix-to-the-names-of-the-ksm-private-structures.patch
ksm-convert-ksm_mm_slotmm_list-to-ksm_mm_slotmm_node.patch
ksm-convert-ksm_mm_slotlink-to-ksm_mm_slothash.patch
ksm-convert-to-use-common-struct-mm_slot.patch
mm-use-update_mmu_tlb-on-the-second-thread.patch
loongarch-update-local-tlb-if-pte-entry-exists.patch