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

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Date:   Tue, 21 Jul 2020 07:11:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Rich Felker <dalias@...c.org>
Cc:     Christoph Hellwig <hch@....de>,
        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 Mon, Jul 20, 2020 at 11:17:26PM -0400, Rich Felker wrote:
> 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.

As the dma-mapping maintainer:  please pick it.  I'd give you an
ACK, but that looks kinda silly if I'm the author as well :)