linux-kernel - Re: build failure of next-20221005 due to 4078ec1ef5ed ("LoongArch: Use TLB for ioremap()")

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Date:   Wed, 5 Oct 2022 20:30:34 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: build failure of next-20221005 due to 4078ec1ef5ed ("LoongArch:
 Use TLB for ioremap()")

Hi, Sudip,

This seems a false positive. When the implementation of iounmap() is
empty (but this is completely legal I think), these drivers will cause
"unused variable error".

Huacai

On Wed, Oct 5, 2022 at 7:43 PM Sudip Mukherjee (Codethink)
<sudipm.mukherjee@...il.com> wrote:
>
> Hi All,
>
> The builds of loongarch allmodconfig have failed to build next-20221005
> with errors
>
> sound/soc/mediatek/common/mtk-btcvsd.c: In function 'mtk_btcvsd_snd_remove':
> sound/soc/mediatek/common/mtk-btcvsd.c:1394:32: error: unused variable 'btcvsd' [-Werror=unused-variable]
>  1394 |         struct mtk_btcvsd_snd *btcvsd = dev_get_drvdata(&pdev->dev);
>       |                                ^~~~~~
>
>
> sound/soc/sof/intel/hda.c: In function 'hda_dsp_remove':
> sound/soc/sof/intel/hda.c:1185:26: error: unused variable 'bus' [-Werror=unused-variable]
>  1185 |         struct hdac_bus *bus = sof_to_bus(sdev);
>       |                          ^~~
>
>
> drivers/mfd/asic3.c: In function 'asic3_mfd_remove':
> drivers/mfd/asic3.c:940:23: error: unused variable 'asic' [-Werror=unused-variable]
>   940 |         struct asic3 *asic = platform_get_drvdata(pdev);
>       |                       ^~~~
>
>
> drivers/gpu/drm/exynos/exynos7_drm_decon.c: In function 'decon_remove':
> drivers/gpu/drm/exynos/exynos7_drm_decon.c:771:31: error: unused variable 'ctx' [-Werror=unused-variable]
>   771 |         struct decon_context *ctx = dev_get_drvdata(&pdev->dev);
>       |
>
>
> git bisect pointed to 4078ec1ef5ed ("LoongArch: Use TLB for ioremap()")
>
> I will be happy to test any patch or provide any extra log if needed.
>
>
> --
> Regards
> Sudip
>