linux-kernel - Re: arch/m68k/68000/ints.c:82:30: error: 'ISR' undeclared

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Date:   Thu, 2 Jun 2022 09:23:57 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Greg Ungerer <gerg@...ux-m68k.org>, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: arch/m68k/68000/ints.c:82:30: error: 'ISR' undeclared

On Tue, May 31, 2022 at 5:44 PM kernel test robot <lkp@...el.com> wrote:
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   8ab2afa23bd197df47819a87f0265c0ac95c5b6a
> commit: 6b8be804ff376f6657ccdf6b29974e7c793d88c4 m68knommu: fix 68000 CPU link with no platform selected
> date:   6 days ago
> config: m68k-buildonly-randconfig-r004-20220530 (https://download.01.org/0day-ci/archive/20220531/202205310707.ppwnnzce-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 11.3.0
> 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=6b8be804ff376f6657ccdf6b29974e7c793d88c4
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 6b8be804ff376f6657ccdf6b29974e7c793d88c4
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash arch/m68k/68000/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
>    arch/m68k/68000/ints.c:77:6: warning: no previous prototype for 'process_int' [-Wmissing-prototypes]
>       77 | void process_int(int vec, struct pt_regs *fp)
>          |      ^~~~~~~~~~~
>    arch/m68k/68000/ints.c: In function 'process_int':
> >> arch/m68k/68000/ints.c:82:30: error: 'ISR' undeclared (first use in this function)
>       82 |         unsigned long pend = ISR;
>          |                              ^~~
>    arch/m68k/68000/ints.c:82:30: note: each undeclared identifier is reported only once for each function it appears in
>    arch/m68k/68000/ints.c: In function 'intc_irq_unmask':
> >> arch/m68k/68000/ints.c:135:9: error: 'IMR' undeclared (first use in this function)
>      135 |         IMR &= ~(1 << d->irq);
>          |         ^~~
>    arch/m68k/68000/ints.c: In function 'intc_irq_mask':
>    arch/m68k/68000/ints.c:140:9: error: 'IMR' undeclared (first use in this function)
>      140 |         IMR |= (1 << d->irq);
>          |         ^~~
>    arch/m68k/68000/ints.c: At top level:
>    arch/m68k/68000/ints.c:153:13: warning: no previous prototype for 'trap_init' [-Wmissing-prototypes]
>      153 | void __init trap_init(void)
>          |             ^~~~~~~~~
>    arch/m68k/68000/ints.c:172:13: warning: no previous prototype for 'init_IRQ' [-Wmissing-prototypes]
>      172 | void __init init_IRQ(void)
>          |             ^~~~~~~~
>    arch/m68k/68000/ints.c: In function 'init_IRQ':
> >> arch/m68k/68000/ints.c:176:9: error: 'IVR' undeclared (first use in this function)
>      176 |         IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
>          |         ^~~
>    arch/m68k/68000/ints.c:179:9: error: 'IMR' undeclared (first use in this function)
>      179 |         IMR = ~0;
>          |         ^~~

If M68000=y, but none of M68{,EZ,VZ}328 are enabled, ISR and IMR are
not defined. Most of the code in arch/m68k/68000/ints.c is specific
to the '328 series, and does not apply to plain 68000, but we can't
just not compile ints.c, as we do need definitions of trap_init()
and init_IRQ().
Factor out the '328 parts in dragonball.o, and keep a __weak dummy
init_IRQ() in ints.c?

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