linux-kernel - Re: [PATCH v4 03/10] powerpc/mm: Move vma_mmu

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Date:   Thu, 09 Dec 2021 19:36:14 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     "alex@...ti.fr" <alex@...ti.fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v4 03/10] powerpc/mm: Move vma_mmu_pagesize()

Excerpts from Christophe Leroy's message of December 9, 2021 3:18 am:
> vma_mmu_pagesize() is only required for slices,
> otherwise there is a generic weak version doing the
> exact same thing.
> 
> Move it to slice.c
> 

Reviewed-by: Nicholas Piggin <npiggin@...il.com>

> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/mm/hugetlbpage.c | 11 -----------
>  arch/powerpc/mm/slice.c       |  9 +++++++++
>  2 files changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
> index ddead41e2194..0eec3b61bd13 100644
> --- a/arch/powerpc/mm/hugetlbpage.c
> +++ b/arch/powerpc/mm/hugetlbpage.c
> @@ -565,17 +565,6 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>  }
>  #endif
>  
> -unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
> -{
> -	/* With radix we don't use slice, so derive it from vma*/
> -	if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled()) {
> -		unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start);
> -
> -		return 1UL << mmu_psize_to_shift(psize);
> -	}
> -	return vma_kernel_pagesize(vma);
> -}
> -
>  bool __init arch_hugetlb_valid_size(unsigned long size)
>  {
>  	int shift = __ffs(size);
> diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
> index f42711f865f3..8a3ac062b71e 100644
> --- a/arch/powerpc/mm/slice.c
> +++ b/arch/powerpc/mm/slice.c
> @@ -759,4 +759,13 @@ int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
>  
>  	return !slice_check_range_fits(mm, maskp, addr, len);
>  }
> +
> +unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
> +{
> +	/* With radix we don't use slice, so derive it from vma*/
> +	if (radix_enabled())
> +		return vma_kernel_pagesize(vma);
> +
> +	return 1UL << mmu_psize_to_shift(get_slice_psize(vma->vm_mm, vma->vm_start));
> +}
>  #endif
> -- 
> 2.33.1
> 
>