linux-kernel - Re: [PATCH 4/4] DMA: XILINX_ZYNQMP_DPDMA depends on HAS

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Date:   Sun, 23 May 2021 21:53:13 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Stefan Roese <sr@...x.de>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        Sinan Kaya <okaya@...eaurora.org>,
        Green Wan <green.wan@...ive.com>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Tejas Upadhyay <tejasu@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 4/4] DMA: XILINX_ZYNQMP_DPDMA depends on HAS_IOMEM

Hi Randy,

On Sat, May 22, 2021 at 06:07:01PM -0700, Randy Dunlap wrote:
> On 5/22/21 5:20 PM, Laurent Pinchart wrote:
> > On Fri, May 21, 2021 at 07:13:13PM -0700, Randy Dunlap wrote:
> >> When CONFIG_HAS_IOMEM is not set/enabled, most iomap() family
> >> functions [including ioremap(), devm_ioremap(), etc.] are not
> >> available.
> >> Drivers that use these functions should depend on HAS_IOMEM so that
> >> they do not cause build errors.
> >>
> >> Cures this build error:
> >> s390-linux-ld: drivers/dma/xilinx/xilinx_dpdma.o: in function `xilinx_dpdma_probe':
> >> xilinx_dpdma.c:(.text+0x336a): undefined reference to `devm_platform_ioremap_resource'
> > 
> > I've previously posted
> > https://lore.kernel.org/dmaengine/20210520152420.23986-2-laurent.pinchart@ideasonboard.com/T/#u
> > which fixes the same issue (plus an additional one).
> 
> Hi Laurent,
> 
> I didn't add a dependency on OF because OF header files _mostly_
> have stubs so that they work when  OF is enabled or disabled.
> 
> I did find a problem in <linux/of_address.h> where it could end up
> without having a stub. I will post a patch for that soon.
> I'm currently doing lots of randconfig builds on it.

I'm fine with eithe approach, but the patch you've posted to address the
of_address.h issue has an issue itself.

If Vinod would prefer merging this patch instead of mine,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> >> Fixes: 7cbb0c63de3fc ("dmaengine: xilinx: dpdma: Add the Xilinx DisplayPort DMA engine driver")
> >> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> >> Reported-by: kernel test robot <lkp@...el.com>
> >> Cc: Vinod Koul <vkoul@...nel.org>
> >> CC: dmaengine@...r.kernel.org
> >> Cc: Hyun Kwon <hyun.kwon@...inx.com>
> >> Cc: Tejas Upadhyay <tejasu@...inx.com>
> >> Cc: Michal Simek <michal.simek@...inx.com>
> >> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> >> ---
> >>  drivers/dma/Kconfig |    1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> --- linux-next-20210521.orig/drivers/dma/Kconfig
> >> +++ linux-next-20210521/drivers/dma/Kconfig
> >> @@ -702,6 +702,7 @@ config XILINX_ZYNQMP_DMA
> >>  
> >>  config XILINX_ZYNQMP_DPDMA
> >>  	tristate "Xilinx DPDMA Engine"
> >> +	depends on HAS_IOMEM
> >>  	select DMA_ENGINE
> >>  	select DMA_VIRTUAL_CHANNELS
> >>  	help

-- 
Regards,

Laurent Pinchart