linux-kernel - RE: [PATCH] dma: vdma: Fix compilation warnings

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Date:	Mon, 30 Mar 2015 13:18:28 +0000
From:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Anirudha Sarangi" <anirudh@...inx.com>
Subject: RE: [PATCH] dma: vdma: Fix compilation warnings

Hi Stephen,

> -----Original Message-----
> From: Stephen Rothwell [mailto:sfr@...b.auug.org.au]
> Sent: Monday, March 30, 2015 6:41 PM
> To: Appana Durga Kedareswara Rao
> Cc: vinod.koul@...el.com; linux-next@...r.kernel.org; linux-
> kernel@...r.kernel.org; Anirudha Sarangi
> Subject: Re: [PATCH] dma: vdma: Fix compilation warnings
>
> Hi Appana,
>
> On Mon, 30 Mar 2015 11:40:02 +0000 Appana Durga Kedareswara Rao
> <appana.durga.rao@...inx.com> wrote:
> >
> > > -----Original Message-----
> > > From: Stephen Rothwell [mailto:sfr@...b.auug.org.au]
> > > Sent: Monday, March 30, 2015 3:06 PM
> > > To: Appana Durga Kedareswara Rao
> > > Cc: vinod.koul@...el.com; linux-next@...r.kernel.org; linux-
> > > kernel@...r.kernel.org; Anirudha Sarangi; Appana Durga Kedareswara
> > > Rao
> > > Subject: Re: [PATCH] dma: vdma: Fix compilation warnings
> > >
> > > Hi Kedareswara,
> > >
> > > On Mon, 30 Mar 2015 14:30:26 +0530 Kedareswara rao Appana
> > > <appana.durga.rao@...inx.com> wrote:
> > > >
> > > > diff --git a/include/linux/dmapool.h b/include/linux/dmapool.h
> > > > index 022e34f..01c91bb 100644
> > > > --- a/include/linux/dmapool.h
> > > > +++ b/include/linux/dmapool.h
> > > > @@ -13,6 +13,7 @@
> > > >
> > > >  #include <asm/io.h>
> > > >  #include <asm/scatterlist.h>
> > > > +#include <linux/device.h>
> > > >
> > > >  struct dma_pool *dma_pool_create(const char *name, struct device
> *dev,
> > > >                     size_t size, size_t align, size_t allocation);
> > >
> > > This might be to much, all it really needs is a
> > >
> > > struct device;
> > >
> > > line ...
> >
> > Why it is a better solution rather than including header file?
> > I didn't get you could you please explain a bit.
>
> When adding an include to an include file, there is always the chance that you
> may create a circular include and break some other unrelated code.  In this
> case the far more unintrusive fix is to just add the forward declaration of the
> struct to satisfy the compiler as the actual definition of the struct is not
> needed (since only pointers to the struct are referenced in dmapool.h).
>

Ok got it thanks for the clarification.

Will send a v2 with the change that you suggested.

Regards,
Kedar.

> --
> Cheers,
> Stephen Rothwell                    sfr@...b.auug.org.au


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