linux-kernel - Re: [PATCH] acpi: Fix header declaration of acpi_arch_dma_setup() w/o CONFIG

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Message-ID: <0953941a-ad4e-ba7e-4f4e-64c47de71f0b@huawei.com>
Date:   Thu, 1 Jun 2023 09:48:32 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Dave Jiang <dave.jiang@...el.com>, <lpieralisi@...nel.org>,
        <sudeep.holla@....com>
CC:     kernel test robot <lkp@...el.com>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        <rafael@...nel.org>, <lenb@...nel.org>,
        <linux-acpi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] acpi: Fix header declaration of acpi_arch_dma_setup() w/o
 CONFIG_ACPI

Hi Dave,

Sorry for the late reply, I have some comments inline.

On 2023/5/23 0:06, Dave Jiang wrote:
> arm64 build can be done without CONFIG_ACPI. The ifdef bits for
> acpi_arch_dma_setup() is placed inside CONFIG_ACPI. When CONFIG_ACPI is
> not set, this causes warning reported by kernel test bot. Move the
> prototype declaration for acpi_arch_dma_setup() outside of CONFIG_ACPI.

...

> 
>>> drivers/acpi/arm64/dma.c:7:6: warning: no previous prototype for function 'acpi_arch_dma_setup' [-Wmissing-prototypes]
>     void acpi_arch_dma_setup(struct device *dev)
>          ^
>     drivers/acpi/arm64/dma.c:7:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>     void acpi_arch_dma_setup(struct device *dev)
>     ^
>     static
>     1 warning generated.

drivers/acpi can only be compiled with CONFIG_ACPI=y, so
drivers/acpi/arm64/ will be the same, not sure how to trigger
this compile warning.

I disable CONFIG_ACPI on my ARM64 machine, but didn't get the
warning you reported.

> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202305200933.afKCLlxS-lkp@intel.com/

How to generate the kernel config file as you kindly attached in the
link?

Thanks
Hanjun