linux-kernel - Re: [PATCH v2 10/11] powerpc/mm: define subarch SLB_ADDR_LIMIT

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Message-Id: <87o94t9sh5.fsf@linux.ibm.com>
Date:   Fri, 26 Apr 2019 12:13:34 +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 10/11] powerpc/mm: define subarch SLB_ADDR_LIMIT_DEFAULT

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

> This patch defines a subarch specific SLB_ADDR_LIMIT_DEFAULT
> to remove the #ifdefs around the setup of mm->context.slb_addr_limit
>
> It also generalises the use of mm_ctx_set_slb_addr_limit() helper.
>

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

> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  arch/powerpc/include/asm/book3s/64/slice.h | 2 ++
>  arch/powerpc/include/asm/nohash/32/slice.h | 2 ++
>  arch/powerpc/mm/hash_utils_64.c            | 2 +-
>  arch/powerpc/mm/slice.c                    | 6 +-----
>  arch/powerpc/mm/tlb_nohash.c               | 4 +---
>  5 files changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/slice.h b/arch/powerpc/include/asm/book3s/64/slice.h
> index 062e11136e9c..f0d3194ba41b 100644
> --- a/arch/powerpc/include/asm/book3s/64/slice.h
> +++ b/arch/powerpc/include/asm/book3s/64/slice.h
> @@ -11,4 +11,6 @@
>  #define SLICE_NUM_HIGH		(H_PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
>  #define GET_HIGH_SLICE_INDEX(addr)	((addr) >> SLICE_HIGH_SHIFT)
>  
> +#define SLB_ADDR_LIMIT_DEFAULT	DEFAULT_MAP_WINDOW_USER64
> +
>  #endif /* _ASM_POWERPC_BOOK3S_64_SLICE_H */
> diff --git a/arch/powerpc/include/asm/nohash/32/slice.h b/arch/powerpc/include/asm/nohash/32/slice.h
> index 777d62e40ac0..39eb0154ae2d 100644
> --- a/arch/powerpc/include/asm/nohash/32/slice.h
> +++ b/arch/powerpc/include/asm/nohash/32/slice.h
> @@ -13,6 +13,8 @@
>  #define SLICE_NUM_HIGH		0ul
>  #define GET_HIGH_SLICE_INDEX(addr)	(addr & 0)
>  
> +#define SLB_ADDR_LIMIT_DEFAULT	DEFAULT_MAP_WINDOW
> +
>  #endif /* CONFIG_PPC_MM_SLICES */
>  
>  #endif /* _ASM_POWERPC_NOHASH_32_SLICE_H */
> diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> index f727197de713..884246e3bf0b 100644
> --- a/arch/powerpc/mm/hash_utils_64.c
> +++ b/arch/powerpc/mm/hash_utils_64.c
> @@ -1050,7 +1050,7 @@ void __init hash__early_init_mmu(void)
>  	htab_initialize();
>  
>  	init_mm.context.hash_context = &init_hash_mm_context;
> -	init_mm.context.hash_context->slb_addr_limit = DEFAULT_MAP_WINDOW_USER64;
> +	mm_ctx_set_slb_addr_limit(&init_mm.context, SLB_ADDR_LIMIT_DEFAULT);
>  
>  	pr_info("Initializing hash mmu with SLB\n");
>  	/* Initialize SLB management */
> diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
> index ace97d953040..97fbf7b54422 100644
> --- a/arch/powerpc/mm/slice.c
> +++ b/arch/powerpc/mm/slice.c
> @@ -704,11 +704,7 @@ void slice_init_new_context_exec(struct mm_struct *mm)
>  	 * case of fork it is just inherited from the mm being
>  	 * duplicated.
>  	 */
> -#ifdef CONFIG_PPC64
> -	mm_ctx_set_slb_addr_limit(&mm->context, DEFAULT_MAP_WINDOW_USER64);
> -#else
> -	mm->context.slb_addr_limit = DEFAULT_MAP_WINDOW;
> -#endif
> +	mm_ctx_set_slb_addr_limit(&mm->context, SLB_ADDR_LIMIT_DEFAULT);
>  	mm_ctx_set_user_psize(&mm->context, psize);
>  
>  	/*
> diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
> index 088e0a6b5ade..ba4bff11191f 100644
> --- a/arch/powerpc/mm/tlb_nohash.c
> +++ b/arch/powerpc/mm/tlb_nohash.c
> @@ -802,9 +802,7 @@ void __init early_init_mmu(void)
>  #endif
>  
>  #ifdef CONFIG_PPC_MM_SLICES
> -#if defined(CONFIG_PPC_8xx)
> -	init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW;
> -#endif
> +	mm_ctx_set_slb_addr_limit(&init_mm.context, SLB_ADDR_LIMIT_DEFAULT);
>  #endif
>  }
>  #endif /* CONFIG_PPC64 */
> -- 
> 2.13.3