linux-kernel - Re: [PATCH v2 08/10] MIPS: SGI-IP27: use generic PCI driver

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Date:   Wed, 27 Feb 2019 18:10:55 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 08/10] MIPS: SGI-IP27: use generic PCI driver

On Fri, 22 Feb 2019 06:46:29 -0800
Christoph Hellwig <hch@...radead.org> wrote:

> > diff --git a/arch/mips/include/asm/dma-direct.h b/arch/mips/include/asm/dma-direct.h
> > index b5c240806e1b..bd11e7934df1 100644
> > --- a/arch/mips/include/asm/dma-direct.h
> > +++ b/arch/mips/include/asm/dma-direct.h
> > @@ -2,6 +2,8 @@
> >  #ifndef _MIPS_DMA_DIRECT_H
> >  #define _MIPS_DMA_DIRECT_H 1
> >  
> > +#include <dma-direct.h>
> > +
> >  static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> >  {
> >  	if (!dev->dma_mask)
> 
> How is your mach dma-direct.h scheme going to work, given that
> we already have non-inline declarations of __phys_to_dma / __dma_to_phys
> in this file?

the compiler is fine with the declarations, that's why I left the non-inline
prototypes as they are

> Also this really should go into a separate commit, and we should either
> have all of these functions inline or none.  Having all of them out
> of line seemed a lot saner to me to avoid all the mach header mess.

hmm, so your inline version in include/linux/dma-direct.h is ok, while
doing the same for MIPS in an other header files isn't ? Sounds inconsistent
to me.

Anyway I'll move __phys_to_dma/__dma_to_phy into a fitting/new .c file in
the next version of the series.

Thomas.

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