linux-kernel - Re: [PATCH] MIPS: ralink: export rt_sysc_membase for rt2880

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Message-ID: <CAMhs-H9nfHxGTOgww-cC-s_gkZtJBtWsQkhNKCX3NdTJpD=R0Q@mail.gmail.com>
Date:   Mon, 17 May 2021 08:31:56 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ana.be>,
        John Crispin <john@...ozen.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH] MIPS: ralink: export rt_sysc_membase for rt2880_wdt.c

Hi Guenter,

On Mon, May 17, 2021 at 8:23 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 5/16/21 5:54 PM, Randy Dunlap wrote:
> > rt2880_wdt.c uses (well, attempts to use) rt_sysc_membase. However,
> > when this watchdog driver is built as a loadable module, there is a
> > build error since the rt_sysc_membase symbol is not exported.
> > Export it to quell the build error.
> >
> > ERROR: modpost: "rt_sysc_membase" [drivers/watchdog/rt2880_wdt.ko] undefined!
> >
> > Fixes: 473cf939ff34 ("watchdog: add ralink watchdog driver")
> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: Wim Van Sebroeck <wim@...ana.be>
>
> Acked-by: Guenter Roeck <linux@...ck-us.net>
>
> > Cc: John Crispin <john@...ozen.org>
> > Cc: linux-mips@...r.kernel.org
> > Cc: linux-watchdog@...r.kernel.org
> > ---
> > or make the Kconfig symbol RALINK_WDT bool instead of tristate?
> >
>
> You'd have to change several other config symbols to boolean as well.
>
> Example with PHY_MT7621_PCI=m:
>
> ERROR: modpost: "rt_sysc_membase" [drivers/phy/ralink/phy-mt7621-pci.ko] undefined!
> make[1]: *** [scripts/Makefile.modpost:150: modules-only.symvers] Error 1

This is already changed and not using this rt_* apis anymore. See:

https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git/commit/?h=next&id=60ece833ccd00c4fc9b10bbce2fa6291f61c6230
https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git/commit/?h=next&id=6eded551cefe3ef6e2b3ff76b6a77a2ecd4fa20a

>
> Same with MT7621_WDT=m.
>
> ERROR: modpost: "rt_sysc_membase" [drivers/watchdog/mt7621_wdt.ko] undefined!
>
> At that point I stopped looking.
>
> Guenter

Best regards,
    Sergio Paracuellos

>
> >   arch/mips/ralink/of.c |    2 ++
> >   1 file changed, 2 insertions(+)
> >
> > --- linux-next-20210514.orig/arch/mips/ralink/of.c
> > +++ linux-next-20210514/arch/mips/ralink/of.c
> > @@ -8,6 +8,7 @@
> >
> >   #include <linux/io.h>
> >   #include <linux/clk.h>
> > +#include <linux/export.h>
> >   #include <linux/init.h>
> >   #include <linux/sizes.h>
> >   #include <linux/of_fdt.h>
> > @@ -25,6 +26,7 @@
> >
> >   __iomem void *rt_sysc_membase;
> >   __iomem void *rt_memc_membase;
> > +EXPORT_SYMBOL_GPL(rt_sysc_membase);
> >
> >   __iomem void *plat_of_remap_node(const char *node)
> >   {
> >
>