linux-kernel - Re: [PATCH 2/2] mips: mm: Discard ioremap_uncached

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Date:   Tue, 10 Jul 2018 09:15:17 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, okaya@...eaurora.org,
        chenhc@...ote.com, Sergey.Semin@...latforms.ru,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "# v4 . 11" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] mips: mm: Discard ioremap_uncached_accelerated() method

'
On Mon, Jul 9, 2018 at 3:57 PM Serge Semin <fancer.lancer@...il.com> wrote:
>
> Adaptive ioremap_wc() method is now available (see "mips: mm:
> Create UCA-based ioremap_wc() method" commit). We can use it for
> UCA-featured MMIO transactions in the kernel, so we don't need
> it platform clone ioremap_uncached_accelerated() being declard.
> Seeing it is also unused anywhere in the kernel code, lets remove
> it from io.h arch-specific header then.
>
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
> Singed-off-by: Paul Burton <paul.burton@...s.com>

nit: 'Signed' (on both patches)

> Cc: James Hogan <jhogan@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: linux-mips@...ux-mips.org
> Cc: stable@...r.kernel.org
> ---
>  arch/mips/include/asm/io.h | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
> index babe5155a..360b7ddeb 100644
> --- a/arch/mips/include/asm/io.h
> +++ b/arch/mips/include/asm/io.h
> @@ -301,15 +301,11 @@ static inline void __iomem * __ioremap_mode(phys_addr_t offset, unsigned long si
>         __ioremap_mode((offset), (size), boot_cpu_data.writecombine)
>
>  /*
> - * These two are MIPS specific ioremap variant.         ioremap_cacheable_cow
> - * requests a cachable mapping, ioremap_uncached_accelerated requests a
> - * mapping using the uncached accelerated mode which isn't supported on
> - * all processors.
> + * This is a MIPS specific ioremap variant. ioremap_cacheable_cow
> + * requests a cachable mapping with CWB attribute enabled.
>   */
>  #define ioremap_cacheable_cow(offset, size)                            \
>         __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
> -#define ioremap_uncached_accelerated(offset, size)                     \
> -       __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
>
>  static inline void iounmap(const volatile void __iomem *addr)
>  {
> --
> 2.12.0
>
>