linux-kernel - Re: [PATCH 2/2] dmaengine: make QCOM_HIDMA depend on HAS

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Date:   Thu, 16 Feb 2023 10:06:28 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-s390@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, linux-arm-msm@...r.kernel.org,
        dmaengine@...r.kernel.org
Subject: Re: [PATCH 2/2] dmaengine: make QCOM_HIDMA depend on HAS_IOMEM

On Thu, 2023-02-16 at 15:34 +0800, Baoquan He wrote:
> On s390 systems (aka mainframes), it has classic channel devices for
> networking and permanent storage that are currently even more common
> than PCI devices. Hence it could have a fully functional s390 kernel
> with CONFIG_PCI=n, then the relevant iomem mapping functions
> [including ioremap(), devm_ioremap(), etc.] are not available.
> 
> Here let QCOM_HIDMA depend on HAS_IOMEM so that it won't be built to
> cause below compiling error if PCI is unset.
> 
> --------------------------------------------------------
> ld: drivers/dma/qcom/hidma.o: in function `hidma_probe':
> hidma.c:(.text+0x4b46): undefined reference to `devm_ioremap_resource'
> ld: hidma.c:(.text+0x4b9e): undefined reference to `devm_ioremap_resource'
> make[1]: *** [scripts/Makefile.vmlinux:35: vmlinux] Error 1
> make: *** [Makefile:1264: vmlinux] Error 2
> 
> Link: https://lore.kernel.org/all/Y0TcaZD4nB1w+mAQ@MiWiFi-R3L-srv/T/#u
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Cc: Andy Gross <agross@...nel.org>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: dmaengine@...r.kernel.org
> ---
>  drivers/dma/qcom/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/dma/qcom/Kconfig b/drivers/dma/qcom/Kconfig
> index 3f926a653bd8..ace75d7b835a 100644
> --- a/drivers/dma/qcom/Kconfig
> +++ b/drivers/dma/qcom/Kconfig
> @@ -45,6 +45,7 @@ config QCOM_HIDMA_MGMT
>  
>  config QCOM_HIDMA
>  	tristate "Qualcomm Technologies HIDMA Channel support"
> +	depends on HAS_IOMEM
>  	select DMA_ENGINE
>  	help
>  	  Enable support for the Qualcomm Technologies HIDMA controller.

Thanks for the patch!

Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com?