linux-kernel - Re: [PATCH v2 2/2] asm-generic: Add new pci.h and use it

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Date:   Tue, 19 Jul 2022 22:33:52 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-um <linux-um@...ts.infradead.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] asm-generic: Add new pci.h and use it

On Tue, Jul 19, 2022 at 03:18:17PM +0200, Arnd Bergmann wrote:
> On Tue, Jul 19, 2022 at 3:05 PM Stafford Horne <shorne@...il.com> wrote:
> > On Tue, Jul 19, 2022 at 09:23:36PM +0900, Stafford Horne wrote:
> > > On Tue, Jul 19, 2022 at 01:55:03PM +0200, Arnd Bergmann wrote:
> 
> >
> > And this is the result, I will get this into the series and create a v4 tomorrow
> > if no issues.
> 
> Looks good to me, just one detail:
> 
> > diff --git a/include/linux/isa-dma.h b/include/linux/isa-dma.h
> > new file mode 100644
> > index 000000000000..9514f0949fa1
> > --- /dev/null
> > +++ b/include/linux/isa-dma.h
> > @@ -0,0 +1,12 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef __LINUX_ISA_DMA_H
> > +#define __LINUX_ISA_DMA_H
> > +
> > +#if defined(CONFIG_PCI) && defined(CONFIG_X86_32)
> > +extern int isa_dma_bridge_buggy;
> > +#else
> > +#define isa_dma_bridge_buggy   (0)
> > +#endif
> > +
> > +#endif /* __LINUX_ISA_DMA_H */
> 
> I would make this file #include <asm/dma.h> as a step towards making
> linux/isa-dma.h the official replacement for it in the driver api.
> 
> Including asm/dma.h from a driver is already a bit awkward, since we
> are generally moving towards including only linux/*.h type headers, and
> the dma.h name is too generic for something that is completely obsolete.

OK, that makes sense.  Then I can remove the asm/dma.h include from:
 - drivers/comedi/drivers/comedi_isadma.c
 - sound/core/isadma.c

-Stafford