linux-kernel - Re: [PATCH 2/3] pagewalk: separate function pointers from iterator data

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Date:   Sun, 1 Sep 2019 13:35:16 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Hellström <thomas@...pmail.org>,
        Jerome Glisse <jglisse@...hat.com>,
        Steven Price <steven.price@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [PATCH 2/3] pagewalk: separate function pointers from iterator
 data

On 9/1/19 12:36 PM, Jason Gunthorpe wrote:
> On Sun, Sep 01, 2019 at 11:45:30AM -0700, Guenter Roeck wrote:
>> On Wed, Aug 28, 2019 at 04:19:54PM +0200, Christoph Hellwig wrote:
>>> The mm_walk structure currently mixed data and code.  Split out the
>>> operations vectors into a new mm_walk_ops structure, and while we
>>> are changing the API also declare the mm_walk structure inside the
>>> walk_page_range and walk_page_vma functions.
>>>
>>> Based on patch from Linus Torvalds.
>>>
>>> Signed-off-by: Christoph Hellwig <hch@....de>
>>> Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
>>> Reviewed-by: Steven Price <steven.price@....com>
>>> Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
>>
>> When building csky:defconfig:
>>
>> In file included from mm/madvise.c:30:
>> mm/madvise.c: In function 'madvise_free_single_vma':
>> arch/csky/include/asm/tlb.h:11:11: error:
>> 	invalid type argument of '->' (have 'struct mmu_gather')
> 
> I belive the macros above are missing brackets.. Can you confirm the
> below takes care of things? I'll add a patch if so
> 

Good catch. Yes, that fixes the build problem.

Guenter

> diff --git a/arch/csky/include/asm/tlb.h b/arch/csky/include/asm/tlb.h
> index 8c7cc097666f04..fdff9b8d70c811 100644
> --- a/arch/csky/include/asm/tlb.h
> +++ b/arch/csky/include/asm/tlb.h
> @@ -8,14 +8,14 @@
>   
>   #define tlb_start_vma(tlb, vma) \
>   	do { \
> -		if (!tlb->fullmm) \
> -			flush_cache_range(vma, vma->vm_start, vma->vm_end); \
> +		if (!(tlb)->fullmm) \
> +			flush_cache_range(vma, (vma)->vm_start, (vma)->vm_end); \
>   	}  while (0)
>   
>   #define tlb_end_vma(tlb, vma) \
>   	do { \
> -		if (!tlb->fullmm) \
> -			flush_tlb_range(vma, vma->vm_start, vma->vm_end); \
> +		if (!(tlb)->fullmm) \
> +			flush_tlb_range(vma, (vma)->vm_start, (vma)->vm_end); \
>   	}  while (0)
>   
>   #define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
> 
> Thanks,
> Jason
>