linux-kernel - Re: [PATCH] iio: magnetometer: hmc5843: Clean up redundant code.

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Date:   Fri, 21 Sep 2018 23:56:16 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     songqiang1304521@...il.com
Cc:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: magnetometer: hmc5843: Clean up redundant code.

Hi Song,

On Fri, Sep 21, 2018 at 04:10:16PM +0800, kbuild test robot wrote:
> Hi Song,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on iio/togreg]
> [also build test ERROR on v4.19-rc4 next-20180920]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Song-Qiang/iio-magnetometer-hmc5843-Clean-up-redundant-code/20180921-091239
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
> config: x86_64-randconfig-u0-09211331 (attached as .config)
> compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All errors (new ones prefixed by >>):
> 
> >> ERROR: "hmc5843_volatile_table" [drivers/iio/magnetometer/hmc5843_i2c.ko] undefined!
> >> ERROR: "hmc5843_readable_table" [drivers/iio/magnetometer/hmc5843_i2c.ko] undefined!
> >> ERROR: "hmc5843_writable_table" [drivers/iio/magnetometer/hmc5843_i2c.ko] undefined!

You would need to export these above symbols using EXPORT_SYMBOL()
to be used by i2c/spi modules.

But on the other hand, exporting too many symbols is a bad idea since
it is only used for this driver and not at any other place in IIO.
So, in my opinion drop this patch and leave the code as-is.

https://lkml.org/lkml/2018/7/16/566 --> worth reading


Thanks
-- 
Himanshu Jha
Undergraduate Student
Department of Electronics & Communication
Guru Tegh Bahadur Institute of Technology