linux-kernel - Re: [PATCH v1] riscv : support update_mmu

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Date:   Tue, 6 Sep 2022 15:25:13 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <ajones@...tanamicro.com>, <tjytimi@....com>
CC:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <anup@...infault.org>,
        <alexandre.ghiti@...onical.com>, <guoren@...nel.org>,
        <akpm@...ux-foundation.org>, <heiko@...ech.de>,
        <tongtiangen@...wei.com>, <sunnanyong@...wei.com>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <falcon@...ylab.org>
Subject: Re: [PATCH v1] riscv : support update_mmu_tlb() for riscv

On 06/09/2022 15:41, Andrew Jones wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Tue, Sep 06, 2022 at 08:19:21PM +0800, Jinyu Tang wrote:
> [PATCH v1] riscv : support update_mmu_tlb() for riscv

Another nit to fix when you sort out Drew's request below,
drop the space between riscv & : please.
Thanks,
Conor.

>> Add macro definition to support updata_mmu_tlb() for riscv,
>> this function is from commit:7df676974359 ("mm/memory.c:Update
>> local TLB if PTE entry exists").
>>
>> Signed-off-by: Jinyu Tang <tjytimi@....com>
>> ---
>>  arch/riscv/include/asm/pgtable.h | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
>> index 7ec936910a96..84a791d54f95 100644
>> --- a/arch/riscv/include/asm/pgtable.h
>> +++ b/arch/riscv/include/asm/pgtable.h
>> @@ -418,6 +418,9 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
>>       local_flush_tlb_page(address);
>>  }
>>
>> +#define      __HAVE_ARCH_UPDATE_MMU_TLB
>            ^ just a single space here, please, as all the other
>              'define __HAVE's in this file
> 
>> +#define update_mmu_tlb       update_mmu_cache
>> +
>>  static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
>>               unsigned long address, pmd_t *pmdp)
>>  {
>> --
>> 2.30.2
> 
> This seems like the right thing to do, so
> 
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> 
> I'm curious if this patch is the result of debugging something? Or what
> led you to post it?
> 
> Thanks,
> drew