linux-kernel - Re: ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko] undefined!

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Message-ID: <0717b3a5-d838-e1ed-a4ac-80cf14f3a6aa@infradead.org>
Date:   Mon, 31 May 2021 07:34:07 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     kernel test robot <lkp@...el.com>, Andrew Lunn <andrew@...n.ch>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rich Felker <dalias@...c.org>,
        David Daney <david.daney@...ium.com>
Subject: Re: ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko]
 undefined!

On 5/31/21 12:36 AM, Geert Uytterhoeven wrote:
> On Mon, May 31, 2021 at 3:13 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>> On 5/30/21 5:05 PM, Randy Dunlap wrote:
>>> On 5/29/21 4:25 PM, kernel test robot wrote:
>>>> First bad commit (maybe != root cause):
>>>>
>>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>>> head:   df8c66c4cfb91f2372d138b9b714f6df6f506966
>>>> commit: a9770eac511ad82390b9f4a3c1728e078c387ac7 net: mdio: Move MDIO drivers into a new subdirectory
>>>> date:   9 months ago
>>>> config: sh-allmodconfig (attached as .config)
>>>> compiler: sh4-linux-gcc (GCC) 9.3.0
>>>> reproduce (this is a W=1 build):
>>>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>>         chmod +x ~/bin/make.cross
>>>>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a9770eac511ad82390b9f4a3c1728e078c387ac7
>>>>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>         git fetch --no-tags linus master
>>>>         git checkout a9770eac511ad82390b9f4a3c1728e078c387ac7
>>>>         # save the attached .config to linux build tree
>>>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh
>>>>
>>>> If you fix the issue, kindly add following tag as appropriate
>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>>
>>>> All errors (new ones prefixed by >>, old ones prefixed by <<):
>>>>
>>>>>> ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko] undefined!
>>
>> Should we make this one driver depend on !SUPERH ?
> 
> No, we should just fix the driver instead.
> 
> +               /* Wait 1000 clocks so we don't saturate the RSL bus
> +                * doing reads.
> +                */
> +               __delay(1000);
> 
> As this is used only on Cavium Octeon and Thunder SoCs, running
> at 400-600 MHz resp. 1800-2000 Mhz, what about replacing the __delay()
> call by a call to udelay(1) or udelay(2)?

Yeah, I was planning to look into that change this week,
but it would probably be better for David to do it.


thanks.
-- 
~Randy