linux-kernel - Re: [PATCH v1] arm64: tlb: fix the TTL value of tlb_get

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Date:   Thu, 24 Jun 2021 09:55:53 +0800
From:   Zhenyu Ye <yezhenyu2@...wei.com>
To:     Will Deacon <will@...nel.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        <aneesh.kumar@...ux.ibm.com>, Marc Zyngier <maz@...nel.org>,
        <steven.price@....com>, Peter Zijlstra <peterz@...radead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-mm@...ck.org>, Xiexiangyou <xiexiangyou@...wei.com>,
        <liushixin2@...wei.com>, huyaqin <huyaqin1@...wei.com>,
        <zhurui3@...wei.com>
Subject: Re: [PATCH v1] arm64: tlb: fix the TTL value of tlb_get_level

On 2021/6/23 19:04, Will Deacon wrote:
> On Wed, Jun 23, 2021 at 03:05:22PM +0800, Zhenyu Ye wrote:
>> diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
>> index 61c97d3b58c7..c995d1f4594f 100644
>> --- a/arch/arm64/include/asm/tlb.h
>> +++ b/arch/arm64/include/asm/tlb.h
>> @@ -28,6 +28,10 @@ static void tlb_flush(struct mmu_gather *tlb);
>>   */
>>  static inline int tlb_get_level(struct mmu_gather *tlb)
>>  {
>> +	/* The TTL field is only valid for the leaf entry. */
>> +	if (tlb->freed_tables)
>> +		return 0;
>> +
>>  	if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
>>  				   tlb->cleared_puds ||
>>  				   tlb->cleared_p4ds))
> 
> Thanks. I can't see a better way around this, so I'll queue the patch.
> The stage-2 page-table code looks ok afaict, but please can you check it
> too?

The stage-2 page-table codes seem to be correct to me.

Thanks,
Zhenyu