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arm64: mm: use ptep_clear() instead of pte_clear() in clear_flush() 

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@linux.dev
Fixes: 42b2547137 ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Qi Zheng 2023-08-10 09:32:41 +00:00 committed by Andrew Morton
parent 5003a2bdf6
commit 00de2c9f26
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/mm/hugetlbpage.c
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@ -236,7 +236,7 @@ static void clear_flush(struct mm_struct *mm,
unsigned long i, saddr = addr; unsigned long i, saddr = addr;
for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) 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); flush_tlb_range(&vma, saddr, addr);
} }