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

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Message-ID: <CAMuHMdW1xZ-vJe2eOehNSKCP3T=-eq7ji4MBo3D6oGJyPNXGDw@mail.gmail.com>
Date:   Mon, 31 May 2021 09:36:40 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Randy Dunlap <rdunlap@...radead.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 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)?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds