linux-kernel - Re: [PATCH v2] dma: vdma: Fix compilation warnings

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Date:	Tue, 31 Mar 2015 07:35:43 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	anirudh@...inx.com, Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH v2] dma: vdma: Fix compilation warnings

Hi Vinod,

On Mon, 30 Mar 2015 22:48:46 +0530 Vinod Koul <vinod.koul@...el.com> wrote:
>
> On Mon, Mar 30, 2015 at 06:48:29PM +0530, Kedareswara rao Appana wrote:
> > This patch fixes the following compilation warnings.
> > In file included from drivers/dma/xilinx/xilinx_vdma.c:26:0:
> > include/linux/dmapool.h:18:4: warning: 'struct device' declared inside parameter list
> >     size_t size, size_t align, size_t allocation);
> >     ^
> > include/linux/dmapool.h:18:4: warning: its scope is only this definition or declaration, which is probably not what you want
> > include/linux/dmapool.h:31:7: warning: 'struct device' declared inside parameter list
> >        size_t size, size_t align, size_t allocation);
> >        ^
> > drivers/dma/xilinx/xilinx_vdma.c: In function 'xilinx_vdma_alloc_chan_resources':
> > drivers/dma/xilinx/xilinx_vdma.c:501:20: warning: passing argument 2 of 'dma_pool_create' from incompatible pointer type
> >   chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
> >                     ^
> > In file included from drivers/dma/xilinx/xilinx_vdma.c:26:0:
> > include/linux/dmapool.h:17:18: note: expected 'struct device *' but argument is of type 'struct device *'
> >  struct dma_pool *dma_pool_create(const char *name, struct device *dev, .
> > 
> Well this does fix this error but this can also be fixed by rearranging the
> driver header files order.  Since I am not inclined to update a patch for
> dmapool.h I would go for rearranging drivers header
> 
> --><8---------------><8--------------
> 
> diff --git a/drivers/dma/xilinx/xilinx_vdma.c
> b/drivers/dma/xilinx/xilinx_vdma.c
> index d8434d465885..356ca4bc0ea5 100644
> --- a/drivers/dma/xilinx/xilinx_vdma.c
> +++ b/drivers/dma/xilinx/xilinx_vdma.c
> @@ -23,12 +23,12 @@
>   */
> 
>  #include <linux/bitops.h>
> -#include <linux/dmapool.h>
>  #include <linux/dma/xilinx_dma.h>
>  #include <linux/init.h>
>  #include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
> +#include <linux/dmapool.h>
>  #include <linux/of_address.h>
>  #include <linux/of_dma.h>
>  #include <linux/of_platform.h>
> 
> Any objections?

Yes.  The error is in dmapool.h so it should be fixed once and for
all.  The supplied patch is very unintrusive and means that the problem
won't reappear when someone does some rearrangement of includes in the
future.  The file in question really has no particular maintainer.
Even after your suggested patch, dmapool.h still depend on an implicit
include of device.h.

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

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