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From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date:   Sat, 6 May 2023 14:49:53 +0300
Message-ID: <CAA8EJppqxN6WktBJYou+xCbb4HOy7=yre5DXkLy9F5AA5_UQzg@mail.gmail.com>
Subject: Re: [PATCH RESEND 2/2] dmaengine: make QCOM_HIDMA depend on HAS_IOMEM
To:     Baoquan He <bhe@redhat.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        schnelle@linux.ibm.com, linux-s390@vger.kernel.org,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Vinod Koul <vkoul@kernel.org>, linux-arm-msm@vger.kernel.org,
        dmaengine@vger.kernel.org
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On Sat, 6 May 2023 at 14:17, Baoquan He <bhe@redhat.com> 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
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
> Cc: Andy Gross <agross@kernel.org>
> Cc: Bjorn Andersson <andersson@kernel.org>
> Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: dmaengine@vger.kernel.org
> ---
>  drivers/dma/qcom/Kconfig | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@gmail.com>

-- 
With best wishes
Dmitry