linux-kernel - Re: [PATCH v12 01/14] ARM: mm: add missing pud

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Message-ID: <a9773c79-4fa3-dd26-27f3-bbd88600db1b@huawei.com>
Date:   Tue, 2 Feb 2021 19:48:13 +0800
From:   Ding Tianhong <dingtianhong@...wei.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Nicholas Piggin <npiggin@...il.com>
CC:     <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v12 01/14] ARM: mm: add missing pud_page define to 2-level
 page tables

On 2021/2/2 19:47, Ding Tianhong wrote:
> On 2021/2/2 19:13, Russell King - ARM Linux admin wrote:
>> On Tue, Feb 02, 2021 at 09:05:02PM +1000, Nicholas Piggin wrote:
>>> diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
>>> index c02f24400369..d63a5bb6bd0c 100644
>>> --- a/arch/arm/include/asm/pgtable.h
>>> +++ b/arch/arm/include/asm/pgtable.h
>>> @@ -166,6 +166,9 @@ extern struct page *empty_zero_page;
>>>  
>>>  extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
>>>  
>>> +#define pud_page(pud)		pmd_page(__pmd(pud_val(pud)))
>>> +#define pud_write(pud)		pmd_write(__pmd(pud_val(pud)))
>>
>> As there is no PUD, does it really make sense to return a valid
>> struct page (which will be the PTE page) for pud_page(), which is
>> several tables above?
>>
> --- a/arch/arm/include/asm/pgtable-2level.h
> +++ b/arch/arm/include/asm/pgtable-2level.h
> 
> +static inline int pud_none(pud_t pud)
> +{
> +          return 0;
> +}
> 
 --- a/arch/arm/include/asm/pgtable-2level.h
 +++ b/arch/arm/include/asm/pgtable-2level.h>
 +static inline int pud_page(pud_t pud)
 +{
 +          return 0;
 +}

> I think it could be fix like this.
> 
> Ding
>