linux-kernel - Re: [PATCH 07/18] ARC: ioremap: use more commonly used PAGE

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Date:   Wed, 11 Aug 2021 08:18:00 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Vineet Gupta <vgupta@...nel.org>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH 07/18] ARC: ioremap: use more commonly used PAGE_KERNEL
 based uncached flag

On Tue, Aug 10, 2021 at 05:42:47PM -0700, Vineet Gupta wrote:
> and remove the one off uncached definition for ARC
> 
> Signed-off-by: Vineet Gupta <vgupta@...nel.org>
> ---
>  arch/arc/include/asm/pgtable.h | 3 ---
>  arch/arc/mm/ioremap.c          | 3 ++-
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
> index 80b57c14b430..b054c14f8bf6 100644
> --- a/arch/arc/include/asm/pgtable.h
> +++ b/arch/arc/include/asm/pgtable.h
> @@ -103,9 +103,6 @@
>   */
>  #define PAGE_KERNEL          __pgprot(_K_PAGE_PERMS | _PAGE_CACHEABLE)
>  
> -/* ioremap */
> -#define PAGE_KERNEL_NO_CACHE __pgprot(_K_PAGE_PERMS)
> -
>  /* Masks for actual TLB "PD"s */
>  #define PTE_BITS_IN_PD0		(_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_HW_SZ)
>  #define PTE_BITS_RWX		(_PAGE_EXECUTE | _PAGE_WRITE | _PAGE_READ)
> diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
> index 052bbd8b1e5f..0ee75aca6e10 100644
> --- a/arch/arc/mm/ioremap.c
> +++ b/arch/arc/mm/ioremap.c
> @@ -39,7 +39,8 @@ void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
>  	if (arc_uncached_addr_space(paddr))
>  		return (void __iomem *)(u32)paddr;
>  
> -	return ioremap_prot(paddr, size, pgprot_val(PAGE_KERNEL_NO_CACHE));
> +	return ioremap_prot(paddr, size,
> +			    pgprot_val(pgprot_noncached(PAGE_KERNEL)));

But this becomes _PAGE_CACHEABLE now. What did I miss?

>  }
>  EXPORT_SYMBOL(ioremap);
>  
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.