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From: Mike Rapoport <rppt@kernel.org>
To: Vineet Gupta <vgupta@kernel.org>
Cc: linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH 04/18] ARC: mm: remove pgd_offset_fast
Date: Wed, 11 Aug 2021 08:12:06 +0300	[thread overview]
Message-ID: <YRNcJpyr76h5EK0k@kernel.org> (raw)
In-Reply-To: <20210811004258.138075-5-vgupta@kernel.org>

On Tue, Aug 10, 2021 at 05:42:44PM -0700, Vineet Gupta wrote:
> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
> ---
>  arch/arc/include/asm/pgtable.h | 23 -----------------------
>  arch/arc/mm/fault.c            |  2 +-
>  2 files changed, 1 insertion(+), 24 deletions(-)

Shouldn't this be a part of the patch that removed usage of the scratch reg
for pgd?
 
> diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
> index 0c3e220bd2b4..80b57c14b430 100644
> --- a/arch/arc/include/asm/pgtable.h
> +++ b/arch/arc/include/asm/pgtable.h
> @@ -284,29 +284,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
>  	set_pte(ptep, pteval);
>  }
>  
> -/*
> - * Macro to quickly access the PGD entry, utlising the fact that some
> - * arch may cache the pointer to Page Directory of "current" task
> - * in a MMU register
> - *
> - * Thus task->mm->pgd (3 pointer dereferences, cache misses etc simply
> - * becomes read a register
> - *
> - * ********CAUTION*******:
> - * Kernel code might be dealing with some mm_struct of NON "current"
> - * Thus use this macro only when you are certain that "current" is current
> - * e.g. when dealing with signal frame setup code etc
> - */
> -#ifdef ARC_USE_SCRATCH_REG
> -#define pgd_offset_fast(mm, addr)	\
> -({					\
> -	pgd_t *pgd_base = (pgd_t *) read_aux_reg(ARC_REG_SCRATCH_DATA0);  \
> -	pgd_base + pgd_index(addr);	\
> -})
> -#else
> -#define pgd_offset_fast(mm, addr)	pgd_offset(mm, addr)
> -#endif
> -
>  extern pgd_t swapper_pg_dir[] __aligned(PAGE_SIZE);
>  void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
>  		      pte_t *ptep);
> diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
> index f5657cb68e4f..41f154320964 100644
> --- a/arch/arc/mm/fault.c
> +++ b/arch/arc/mm/fault.c
> @@ -33,7 +33,7 @@ noinline static int handle_kernel_vaddr_fault(unsigned long address)
>  	pud_t *pud, *pud_k;
>  	pmd_t *pmd, *pmd_k;
>  
> -	pgd = pgd_offset_fast(current->active_mm, address);
> +	pgd = pgd_offset(current->active_mm, address);
>  	pgd_k = pgd_offset_k(address);
>  
>  	if (!pgd_present(*pgd_k))
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.

_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc

WARNING: multiple messages have this Message-ID (diff)
From: Mike Rapoport <rppt@kernel.org>
To: Vineet Gupta <vgupta@kernel.org>
Cc: linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH 04/18] ARC: mm: remove pgd_offset_fast
Date: Wed, 11 Aug 2021 08:12:06 +0300	[thread overview]
Message-ID: <YRNcJpyr76h5EK0k@kernel.org> (raw)
In-Reply-To: <20210811004258.138075-5-vgupta@kernel.org>

On Tue, Aug 10, 2021 at 05:42:44PM -0700, Vineet Gupta wrote:
> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
> ---
>  arch/arc/include/asm/pgtable.h | 23 -----------------------
>  arch/arc/mm/fault.c            |  2 +-
>  2 files changed, 1 insertion(+), 24 deletions(-)

Shouldn't this be a part of the patch that removed usage of the scratch reg
for pgd?
 
> diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
> index 0c3e220bd2b4..80b57c14b430 100644
> --- a/arch/arc/include/asm/pgtable.h
> +++ b/arch/arc/include/asm/pgtable.h
> @@ -284,29 +284,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
>  	set_pte(ptep, pteval);
>  }
>  
> -/*
> - * Macro to quickly access the PGD entry, utlising the fact that some
> - * arch may cache the pointer to Page Directory of "current" task
> - * in a MMU register
> - *
> - * Thus task->mm->pgd (3 pointer dereferences, cache misses etc simply
> - * becomes read a register
> - *
> - * ********CAUTION*******:
> - * Kernel code might be dealing with some mm_struct of NON "current"
> - * Thus use this macro only when you are certain that "current" is current
> - * e.g. when dealing with signal frame setup code etc
> - */
> -#ifdef ARC_USE_SCRATCH_REG
> -#define pgd_offset_fast(mm, addr)	\
> -({					\
> -	pgd_t *pgd_base = (pgd_t *) read_aux_reg(ARC_REG_SCRATCH_DATA0);  \
> -	pgd_base + pgd_index(addr);	\
> -})
> -#else
> -#define pgd_offset_fast(mm, addr)	pgd_offset(mm, addr)
> -#endif
> -
>  extern pgd_t swapper_pg_dir[] __aligned(PAGE_SIZE);
>  void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
>  		      pte_t *ptep);
> diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
> index f5657cb68e4f..41f154320964 100644
> --- a/arch/arc/mm/fault.c
> +++ b/arch/arc/mm/fault.c
> @@ -33,7 +33,7 @@ noinline static int handle_kernel_vaddr_fault(unsigned long address)
>  	pud_t *pud, *pud_k;
>  	pmd_t *pmd, *pmd_k;
>  
> -	pgd = pgd_offset_fast(current->active_mm, address);
> +	pgd = pgd_offset(current->active_mm, address);
>  	pgd_k = pgd_offset_k(address);
>  
>  	if (!pgd_present(*pgd_k))
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.


  reply	other threads:[~2021-08-11  5:12 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11  0:42 [PATCH 00/18] ARC mm updates to support 3 or 4 levels of paging Vineet Gupta
2021-08-11  0:42 ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 01/18] ARC: mm: simplify mmu scratch register assingment to mmu needs Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 02/18] ARC: mm: remove tlb paranoid code Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 03/18] ARC: mm: move mmu/cache externs out to setup.h Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  5:10   ` Mike Rapoport
2021-08-11  5:10     ` Mike Rapoport
2021-08-11 18:46     ` Vineet Gupta
2021-08-11 18:46       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 04/18] ARC: mm: remove pgd_offset_fast Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  5:12   ` Mike Rapoport [this message]
2021-08-11  5:12     ` Mike Rapoport
2021-08-11 18:54     ` Vineet Gupta
2021-08-11 18:54       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 05/18] ARC: mm: Fixes to allow STRICT_MM_TYPECHECKS Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 06/18] ARC: mm: Enable STRICT_MM_TYPECHECKS Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11 12:04   ` Mike Rapoport
2021-08-11 12:04     ` Mike Rapoport
2021-08-11 19:01     ` Vineet Gupta
2021-08-11 19:01       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 07/18] ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  5:18   ` Mike Rapoport
2021-08-11  5:18     ` Mike Rapoport
2021-08-11 18:58     ` Vineet Gupta
2021-08-11 18:58       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 08/18] ARC: mm: pmd_populate* to use the canonical set_pmd (and drop pmd_set) Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 09/18] ARC: mm: non-functional code cleanup ahead of 3 levels Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11 12:31   ` Mike Rapoport
2021-08-11 12:31     ` Mike Rapoport
2021-08-12  1:37     ` Vineet Gupta
2021-08-12  1:37       ` Vineet Gupta
2021-08-12  6:18       ` Mike Rapoport
2021-08-12  6:18         ` Mike Rapoport
2021-08-12 18:58         ` Vineet Gupta
2021-08-12 18:58           ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 10/18] ARC: mm: move MMU specific bits out of ASID allocator Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 11/18] ARC: mm: move MMU specific bits out of entry code Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11 12:15   ` Mike Rapoport
2021-08-11 12:15     ` Mike Rapoport
2021-08-11 19:30     ` Vineet Gupta
2021-08-11 19:30       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 12/18] ARC: mm: disintegrate mmu.h (arcv2 bits out) Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 13/18] ARC: mm: disintegrate pgtable.h into levels and flags Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 14/18] ARC: mm: hack to allow 2 level build with 4 level code Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 15/18] ARC: mm: support 3 levels of page tables Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11 12:24   ` Mike Rapoport
2021-08-11 12:24     ` Mike Rapoport
2021-08-11 22:15     ` Vineet Gupta
2021-08-11 22:15       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 16/18] ARC: mm: support 4 " Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11 12:28   ` Mike Rapoport
2021-08-11 12:28     ` Mike Rapoport
2021-08-11 22:17     ` Vineet Gupta
2021-08-11 22:17       ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 17/18] ARC: mm: vmalloc sync from kernel to user table to update PMD Vineet Gupta
2021-08-11  0:42   ` Vineet Gupta
2021-08-11  0:42 ` [PATCH 18/18] ARC: mm: introduce _PAGE_TABLE to explicitly link pgd, pud, pmd entries Vineet Gupta
2021-08-11  0:42   ` [PATCH 18/18] ARC: mm: introduce _PAGE_TABLE to explicitly link pgd,pud,pmd entries Vineet Gupta

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