linux-kernel - Re: [PATCH 08/10] dma-mapping: consolidate the NO

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Date:   Mon, 20 Jul 2020 23:17:26 -0400
From:   Rich Felker <dalias@...c.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/10] dma-mapping: consolidate the NO_DMA definition in
 kernel/dma/Kconfig

On Tue, Jul 14, 2020 at 02:18:54PM +0200, Christoph Hellwig wrote:
> Have a single definition that architetures can select.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/m68k/Kconfig         | 4 +---
>  arch/m68k/Kconfig.machine | 1 +
>  arch/um/Kconfig           | 4 +---
>  kernel/dma/Kconfig        | 3 +++
>  4 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> index 6ad6cdac74b3dc..8e488369a7e55a 100644
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -17,6 +17,7 @@ config M68K
>  	select HAVE_COPY_THREAD_TLS
>  	select GENERIC_IRQ_SHOW
>  	select GENERIC_ATOMIC64
> +	select NO_DMA if !MMU && !COLDFIRE
>  	select HAVE_UID16
>  	select VIRT_TO_BUS
>  	select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
> @@ -60,9 +61,6 @@ config TIME_LOW_RES
>  config NO_IOPORT_MAP
>  	def_bool y
>  
> -config NO_DMA
> -	def_bool (MMU && SUN3) || (!MMU && !COLDFIRE)
> -
>  config ZONE_DMA
>  	bool
>  	default y
> diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
> index a82651d58af483..17e8c3a292d770 100644
> --- a/arch/m68k/Kconfig.machine
> +++ b/arch/m68k/Kconfig.machine
> @@ -126,6 +126,7 @@ config SUN3
>  	depends on MMU
>  	depends on !MMU_MOTOROLA
>  	select MMU_SUN3 if MMU
> +	select NO_DMA
>  	select M68020
>  	help
>  	  This option enables support for the Sun 3 series of workstations
> diff --git a/arch/um/Kconfig b/arch/um/Kconfig
> index 9318dc6d1a0cee..32c1d1945033ec 100644
> --- a/arch/um/Kconfig
> +++ b/arch/um/Kconfig
> @@ -15,6 +15,7 @@ config UML
>  	select HAVE_DEBUG_KMEMLEAK
>  	select HAVE_DEBUG_BUGVERBOSE
>  	select HAVE_COPY_THREAD_TLS
> +	select NO_DMA
>  	select GENERIC_IRQ_SHOW
>  	select GENERIC_CPU_DEVICES
>  	select GENERIC_CLOCKEVENTS
> @@ -168,9 +169,6 @@ config MMAPPER
>  	  This driver allows a host file to be used as emulated IO memory inside
>  	  UML.
>  
> -config NO_DMA
> -	def_bool y
> -
>  config PGTABLE_LEVELS
>  	int
>  	default 3 if 3_LEVEL_PGTABLES
> diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
> index 1da3f44f2565b4..57533d07676f4a 100644
> --- a/kernel/dma/Kconfig
> +++ b/kernel/dma/Kconfig
> @@ -1,5 +1,8 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  
> +config NO_DMA
> +	bool
> +
>  config HAS_DMA
>  	bool
>  	depends on !NO_DMA
> -- 
> 2.26.2

This patch is outside the scope of what I can accept in arch/sh, and
the subsequent patches in the series seem to depend on it. What would
you like to do for its path upstream?

I've now picked up everything else from this series that I can.

Rich