linux-kernel - [PATCH 2/4] mm: mremap: use flush_pmd_tlb_range() in move_normal

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Message-ID: <20230731074829.79309-3-wangkefeng.wang@huawei.com>
Date:   Mon, 31 Jul 2023 15:48:27 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Mina Almasry <almasrymina@...gle.com>, <kirill@...temov.name>,
        <joel@...lfernandes.org>, <william.kucharski@...cle.com>,
        <kaleshsingh@...gle.com>, <linux-mm@...ck.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 2/4] mm: mremap: use flush_pmd_tlb_range() in move_normal_pmd()

Archs may need to do special things when flushing thp tlb,
so use the more applicable flush_pud_tlb_range() instead of
flush_tlb_range().

Fixes: 2c91bd4a4e2e ("mm: speed up mremap by 20x on large regions")
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/mremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 11e06e4ab33b..1883205fa22b 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -284,7 +284,7 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr,
 	VM_BUG_ON(!pmd_none(*new_pmd));
 
 	pmd_populate(mm, new_pmd, pmd_pgtable(pmd));
-	flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE);
+	flush_pmd_tlb_range(vma, old_addr, old_addr + PMD_SIZE);
 	if (new_ptl != old_ptl)
 		spin_unlock(new_ptl);
 	spin_unlock(old_ptl);
-- 
2.41.0