linux-kernel - Re: [PATCH 25/30] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE

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Date:   Fri, 25 Feb 2022 08:38:41 -0600
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 25/30] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT



On 2/25/22 08:29, Dinh Nguyen wrote:
> 
> 
> On 2/25/22 02:52, Anshuman Khandual wrote:
>>
>>
>> On 2/25/22 7:01 AM, Dinh Nguyen wrote:
>>> Hi Anshuman,
>>>
>>> On 2/13/22 20:30, Anshuman Khandual wrote:
>>>> This defines and exports a platform specific custom 
>>>> vm_get_page_prot() via
>>>> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and 
>>>> __PXXX
>>>> macros can be dropped which are no longer needed.
>>>>
>>>> Cc: Dinh Nguyen <dinguyen@...nel.org>
>>>> Cc: linux-kernel@...r.kernel.org
>>>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>>>> Acked-by: Dinh Nguyen <dinguyen@...nel.org>
>>>> ---
>>>>    arch/nios2/Kconfig               |  1 +
>>>>    arch/nios2/include/asm/pgtable.h | 16 ------------
>>>>    arch/nios2/mm/init.c             | 45 
>>>> ++++++++++++++++++++++++++++++++
>>>>    3 files changed, 46 insertions(+), 16 deletions(-)
>>>>
>>>> diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
>>>> index 33fd06f5fa41..85a58a357a3b 100644
>>>> --- a/arch/nios2/Kconfig
>>>> +++ b/arch/nios2/Kconfig
>>>> @@ -6,6 +6,7 @@ config NIOS2
>>>>        select ARCH_HAS_SYNC_DMA_FOR_CPU
>>>>        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>>>>        select ARCH_HAS_DMA_SET_UNCACHED
>>>> +    select ARCH_HAS_VM_GET_PAGE_PROT
>>>>        select ARCH_NO_SWAP
>>>>        select COMMON_CLK
>>>>        select TIMER_OF
>>>> diff --git a/arch/nios2/include/asm/pgtable.h 
>>>> b/arch/nios2/include/asm/pgtable.h
>>>> index 4a995fa628ee..2678dad58a63 100644
>>>> --- a/arch/nios2/include/asm/pgtable.h
>>>> +++ b/arch/nios2/include/asm/pgtable.h
>>>> @@ -40,24 +40,8 @@ struct mm_struct;
>>>>     */
>>>>      /* Remove W bit on private pages for COW support */
>>>> -#define __P000    MKP(0, 0, 0)
>>>> -#define __P001    MKP(0, 0, 1)
>>>> -#define __P010    MKP(0, 0, 0)    /* COW */
>>>> -#define __P011    MKP(0, 0, 1)    /* COW */
>>>> -#define __P100    MKP(1, 0, 0)
>>>> -#define __P101    MKP(1, 0, 1)
>>>> -#define __P110    MKP(1, 0, 0)    /* COW */
>>>> -#define __P111    MKP(1, 0, 1)    /* COW */
>>>>      /* Shared pages can have exact HW mapping */
>>>> -#define __S000    MKP(0, 0, 0)
>>>> -#define __S001    MKP(0, 0, 1)
>>>> -#define __S010    MKP(0, 1, 0)
>>>> -#define __S011    MKP(0, 1, 1)
>>>> -#define __S100    MKP(1, 0, 0)
>>>> -#define __S101    MKP(1, 0, 1)
>>>> -#define __S110    MKP(1, 1, 0)
>>>> -#define __S111    MKP(1, 1, 1)
>>>>      /* Used all over the kernel */
>>>>    #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | 
>>>> _PAGE_READ | \
>>>> diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c
>>>> index 613fcaa5988a..311b2146a248 100644
>>>> --- a/arch/nios2/mm/init.c
>>>> +++ b/arch/nios2/mm/init.c
>>>> @@ -124,3 +124,48 @@ const char *arch_vma_name(struct vm_area_struct 
>>>> *vma)
>>>>    {
>>>>        return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
>>>>    }
>>>> +
>>>> +pgprot_t vm_get_page_prot(unsigned long vm_flags)
>>>> +{
>>>> +    switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
>>>> +    case VM_NONE:
>>>> +        return MKP(0, 0, 0);
>>>> +    case VM_READ:
>>>> +        return MKP(0, 0, 1);
>>>> +    /* COW */
>>>> +    case VM_WRITE:
>>>> +        return MKP(0, 0, 0);
>>>> +    /* COW */
>>>> +    case VM_WRITE | VM_READ:
>>>> +        return MKP(0, 0, 1);
>>>> +    case VM_EXEC:
>>>> +        return MKP(1, 0, 0);
>>>> +    case VM_EXEC | VM_READ:
>>>> +        return MKP(1, 0, 1);
>>>> +    /* COW */
>>>> +    case VM_EXEC | VM_WRITE:
>>>> +        return MKP(1, 0, 0);
>>>> +    /* COW */
>>>> +    case VM_EXEC | VM_WRITE | VM_READ:
>>>> +        return MKP(1, 0, 1);
>>>> +    case VM_SHARED:
>>>> +        return MKP(0, 0, 0);
>>>> +    case VM_SHARED | VM_READ:
>>>> +        return MKP(0, 0, 1);
>>>> +    case VM_SHARED | VM_WRITE:
>>>> +        return MKP(0, 1, 0);
>>>> +    case VM_SHARED | VM_WRITE | VM_READ:
>>>> +        return MKP(0, 1, 1);
>>>> +    case VM_SHARED | VM_EXEC:
>>>> +        return MKP(1, 0, 0);
>>>> +    case VM_SHARED | VM_EXEC | VM_READ:
>>>> +        return MKP(1, 0, 1);
>>>> +    case VM_SHARED | VM_EXEC | VM_WRITE:
>>>> +        return MKP(1, 1, 0);
>>>> +    case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
>>>> +        return MKP(1, 1, 1);
>>>> +    default:
>>>> +        BUILD_BUG();
>>>> +    }
>>>> +}
>>>> +EXPORT_SYMBOL(vm_get_page_prot);
>>>
>>> I'm getting this compile error after applying this patch when build 
>>> NIOS2:
>>
>> Hmm, that is strange.
>>
>> Did you apply the entire series or atleast upto the nios2 patch ? Generic
>> vm_get_page_prot() should not be called (which is build complaining here)
>> when ARCH_HAS_VM_GET_PAGE_PROT is already enabled on nios2 platform.
>>
>> Ran a quick build test on nios2 for the entire series and also just upto
>> this particular patch, build was successful.
>>
> 
> Ok, I did not apply the whole series, just this patch.
> 


Is someone taking this whole series or should I just take this patch?

Dinh