Re: [PATCH 07/18] ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag

From: Mike Rapoport
Date: Wed Aug 11 2021 - 01:18:08 EST


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@xxxxxxxxxx>
> ---
> 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.