linux-kernel - Re: [hyperv:hyperv-next 1/5] kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem

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Message-ID: <20211219123037.uamx2iblzp2mzs7e@liuwe-devbox-debian-v2>
Date:   Sun, 19 Dec 2021 12:30:37 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [hyperv:hyperv-next 1/5] kernel/dma/swiotlb.c:166:7: warning: no
 previous prototype for 'swiotlb_mem_remap'

On Sat, Dec 18, 2021 at 12:03:07PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git hyperv-next
> head:   19fd7ca00201c0525452dcf5a490e4b01674ef4c
> commit: 32be866293fe5355adbf91da1cd612f439fc71e5 [1/5] swiotlb: Add swiotlb bounce buffer remap function for HV IVM
> config: x86_64-randconfig-r001-20211216 (https://download.01.org/0day-ci/archive/20211218/202112181114.Vxt6EAJR-lkp@intel.com/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/commit/?id=32be866293fe5355adbf91da1cd612f439fc71e5
>         git remote add hyperv https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
>         git fetch --no-tags hyperv hyperv-next
>         git checkout 32be866293fe5355adbf91da1cd612f439fc71e5
>         # save the config file to linux build tree
>         mkdir build_dir
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/dma/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem_remap' [-Wmissing-prototypes]
>      166 | void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
>          |       ^~~~~~~~~~~~~~~~~
> 

Adding static should fix this issue.

Wei.