linux-kernel - Re: [PATCH 5/6] MIPS: remove CONFIG_DMA_MAYBE

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Date:   Thu, 18 Feb 2021 10:44:02 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 5/6] MIPS: remove CONFIG_DMA_MAYBE_COHERENT

Reviewed-by: Huacai Chen <chenhuacai@...nel.org>

On Wed, Feb 10, 2021 at 6:04 PM Christoph Hellwig <hch@....de> wrote:
>
> CONFIG_DMA_MAYBE_COHERENT just guards two early init options now.  Just
> enable them unconditionally for CONFIG_DMA_NONCOHERENT.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/mips/Kconfig        | 8 ++------
>  arch/mips/kernel/setup.c | 2 +-
>  2 files changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 0e86162df65541..1f1603a08a6d2d 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -181,7 +181,7 @@ config MIPS_ALCHEMY
>         select CEVT_R4K
>         select CSRC_R4K
>         select IRQ_MIPS_CPU
> -       select DMA_MAYBE_COHERENT       # Au1000,1500,1100 aren't, rest is
> +       select DMA_NONCOHERENT          # Au1000,1500,1100 aren't, rest is
>         select MIPS_FIXUP_BIGPHYS_ADDR if PCI
>         select SYS_HAS_CPU_MIPS32_R1
>         select SYS_SUPPORTS_32BIT_KERNEL
> @@ -546,7 +546,7 @@ config MIPS_MALTA
>         select CLKSRC_MIPS_GIC
>         select COMMON_CLK
>         select CSRC_R4K
> -       select DMA_MAYBE_COHERENT
> +       select DMA_NONCOHERENT
>         select GENERIC_ISA_DMA
>         select HAVE_PCSPKR_PLATFORM
>         select HAVE_PCI
> @@ -1127,10 +1127,6 @@ config FW_CFE
>  config ARCH_SUPPORTS_UPROBES
>         bool
>
> -config DMA_MAYBE_COHERENT
> -       select DMA_NONCOHERENT
> -       bool
> -
>  config DMA_PERDEV_COHERENT
>         bool
>         select ARCH_HAS_SETUP_DMA_OPS
> diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
> index d6b2ba527f5b81..b25d07675b1ee1 100644
> --- a/arch/mips/kernel/setup.c
> +++ b/arch/mips/kernel/setup.c
> @@ -805,7 +805,7 @@ static int __init debugfs_mips(void)
>  arch_initcall(debugfs_mips);
>  #endif
>
> -#ifdef CONFIG_DMA_MAYBE_COHERENT
> +#ifdef CONFIG_DMA_NONCOHERENT
>  static int __init setcoherentio(char *str)
>  {
>         dma_default_coherent = true;
> --
> 2.29.2
>