linux-kernel - Re: [PATCH -next] ACPI/IORT: Fix build error implicit-function-declaration

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Date:   Tue, 26 Jul 2022 11:22:59 +0800
From:   Ren Zhijie <renzhijie2@...wei.com>
To:     Hanjun Guo <guohanjun@...wei.com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "jroedel@...e.de" <jroedel@...e.de>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lorenzo.pieralisi@...aro.org" <lorenzo.pieralisi@...aro.org>
Subject: Re: [PATCH -next] ACPI/IORT: Fix build error
 implicit-function-declaration


在 2022/7/26 10:53, Hanjun Guo 写道:
> On 2022/7/25 21:50, Shameerali Kolothum Thodi wrote:
> [...]
>>>
>>> If CONFIG_ACPI_IORT=y and CONFIG_IOMMU_API is not set,
>>> make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-, will be failed, like
>>> this:
>>>
>>> drivers/acpi/arm64/iort.c: In function ‘iort_get_rmr_sids’:
>>> drivers/acpi/arm64/iort.c:1406:2: error: implicit declaration of 
>>> function
>>> ‘iort_iommu_rmr_get_resv_regions’; did you mean
>>> ‘iort_iommu_get_resv_regions’? [-Werror=implicit-function-declaration]
>>>    iort_iommu_rmr_get_resv_regions(iommu_fwnode, NULL, head);
>>>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>    iort_iommu_get_resv_regions
>>> cc1: some warnings being treated as errors
>>> make[3]: *** [drivers/acpi/arm64/iort.o] Error 1
>>
>> Thanks for spotting this.
>>
>>> The function iort_iommu_rmr_get_resv_regions() is declared at #ifdef
>>> CONFIG_IOMMU_API area, and the callers of  iort_get_rmr_sids() and
>>> iort_put_rmr_sids() would select IOMMU_API.
>>> To fix this error, move the definitions to #ifdef CONFIG_IOMMU_API 
>>> area.
>>
>> That makes sense. And the only callers of these are SMMU drivers I 
>> think we
>> don't need stub functions under !CONFIG_IOMMU_API(Lorenzo, could you
>> please double check this).
>
> I think so, because SMMU drivers will select IOMMU_API,
> in drivers/iommu/Kconfig, it says:
>
> # IOMMU_API always gets selected by whoever wants it.
> config IOMMU_API
> bool
>
>>
>> Nit: Please wrap the commit description to a max of 75 chars per line.
>
> Zhijie, would you mind send a updated version?
>
sure, will send patch v2.

Thanks,

Ren Zhijie

> Thanks
> Hanjun
> .