linux-kernel - Re: kisskb: FAILED linux-next/m68k-allmodconfig/m68k-gcc8 Tue Jan 25, 18:24

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Date:   Tue, 25 Jan 2022 09:47:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     linux-m68k <linux-m68k@...ts.linux-m68k.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Yury Norov <yury.norov@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: kisskb: FAILED linux-next/m68k-allmodconfig/m68k-gcc8 Tue Jan 25, 18:24

On Tue, Jan 25, 2022 at 8:31 AM <noreply@...erman.id.au> wrote:
> FAILED linux-next/m68k-allmodconfig/m68k-gcc8 Tue Jan 25, 18:24
>
> http://kisskb.ellerman.id.au/kisskb/buildresult/14688953/
>
> Commit:   Add linux-next specific files for 20220125
>           d25ee88530253138d0b20d43511ca5acbda4e9f7
> Compiler: m68k-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30
>
> Possible errors
> ---------------
>
> arch/m68k/include/asm/bitops.h:329:20: error: array subscript 2 is above array bounds of 'long unsigned int[1]' [-Werror=array-bounds]
> cc1: all warnings being treated as errors
> make[4]: *** [scripts/Makefile.build:289: drivers/net/ipa/ipa_mem.o] Error 1
> make[3]: *** [scripts/Makefile.build:572: drivers/net/ipa] Error 2
> make[2]: *** [scripts/Makefile.build:572: drivers/net] Error 2
> make[1]: *** [Makefile:1965: drivers] Error 2
> make: *** [Makefile:226: __sub-make] Error 2
>
> No warnings found in log.

The code that causes this is drivers/net/ipa/ipa_mem.c:ipa_mem_valid():

        DECLARE_BITMAP(regions, IPA_MEM_COUNT) = { };
        ...
        for_each_clear_bit(mem_id, regions, IPA_MEM_COUNT) {
                if (ipa_mem_id_required(ipa, mem_id))
                        dev_err(dev, "required memory region %u missing\n",
                                mem_id);
        }

This only happens with gcc-8, not with gcc-9, so it might be a
compiler bug. I don't see anything wrong with c:ipa_mem_valid()
nor with m68k's find_first_zero_bit().

Thanks!

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