linux-kernel - Re: [PATCH v2 09/11] powerpc/mm: define get_slice

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Date:   Fri, 26 Apr 2019 12:12:07 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/11] powerpc/mm: define get_slice_psize() all the time

Christophe Leroy <christophe.leroy@....fr> writes:

> get_slice_psize() can be defined regardless of CONFIG_PPC_MM_SLICES
> to avoid ifdefs
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  arch/powerpc/include/asm/slice.h | 5 +++++
>  arch/powerpc/mm/hugetlbpage.c    | 4 +---
>  2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/slice.h b/arch/powerpc/include/asm/slice.h
> index be8af667098f..c6f466f4c241 100644
> --- a/arch/powerpc/include/asm/slice.h
> +++ b/arch/powerpc/include/asm/slice.h
> @@ -36,6 +36,11 @@ void slice_setup_new_exec(void);
>  
>  static inline void slice_init_new_context_exec(struct mm_struct *mm) {}
>  
> +static inline unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr)
> +{
> +	return 0;
> +}
> +
>  #endif /* CONFIG_PPC_MM_SLICES */
>  
>  #endif /* __ASSEMBLY__ */
> diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
> index 9e732bb2c84a..5f67e7a4d1cc 100644
> --- a/arch/powerpc/mm/hugetlbpage.c
> +++ b/arch/powerpc/mm/hugetlbpage.c
> @@ -578,14 +578,12 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>  
>  unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
>  {
> -#ifdef CONFIG_PPC_MM_SLICES
>  	/* With radix we don't use slice, so derive it from vma*/
> -	if (!radix_enabled()) {
> +	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);
>  	}
> -#endif
>  	return vma_kernel_pagesize(vma);
>  }
>  
> -- 
> 2.13.3