The patch titled
Subject: arm64: mm: use ptep_clear() instead of pte_clear() in clear_flush()
has been added to the -mm mm-unstable branch. Its filename is
arm64-mm-use-ptep_clear-instead-of-pte_clear-in-clear_flush.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-mm-use-ptep_clear-instead-of-pte_clear-in-clear_flush.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 <qi.zheng@xxxxxxxxx>
Subject: arm64: mm: use ptep_clear() instead of pte_clear() in clear_flush()
Date: Thu, 10 Aug 2023 09:32:41 +0000
In clear_flush(), the original pte may be a present entry, so we should
use ptep_clear() to let page_table_check track the pte clearing operation,
otherwise it may cause false positive in subsequent set_pte_at().
Link: https://lkml.kernel.org/r/20230810093241.1181142-1-qi.zheng@xxxxxxxxx
Fixes: 42b2547137f5 ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/hugetlbpage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/mm/hugetlbpage.c~arm64-mm-use-ptep_clear-instead-of-pte_clear-in-clear_flush
+++ a/arch/arm64/mm/hugetlbpage.c
@@ -236,7 +236,7 @@ static void clear_flush(struct mm_struct
unsigned long i, saddr = addr;
for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
- pte_clear(mm, addr, ptep);
+ ptep_clear(mm, addr, ptep);
flush_tlb_range(&vma, saddr, addr);
}
_
Patches currently in -mm which might be from qi.zheng@xxxxxxxxx are
arm64-mm-use-ptep_clear-instead-of-pte_clear-in-clear_flush.patch
