linux-kernel - Re: [v3,17/19] arch/sparc: Implement fb_is_primary

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Date:   Wed, 28 Jun 2023 12:01:58 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Guenter Roeck" <linux@...ck-us.net>,
        "Thomas Zimmermann" <tzimmermann@...e.de>
Cc:     "Daniel Vetter" <daniel.vetter@...ll.ch>,
        "Helge Deller" <deller@....de>,
        "Javier Martinez Canillas" <javierm@...hat.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-fbdev@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-mips@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, loongarch@...ts.linux.dev,
        sparclinux@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org,
        "David S . Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org,
        "Mark Rutland" <mark.rutland@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "KKees Cook" <keescook@...omium.org>,
        "ees Cook" <keescook@...omium.org>
Subject: Re: [v3,17/19] arch/sparc: Implement fb_is_primary_device() in source file

On Sat, Jun 24, 2023, at 16:21, Arnd Bergmann wrote:
> On Sat, Jun 24, 2023, at 15:26, Guenter Roeck wrote:
>> On 6/24/23 02:27, Arnd Bergmann wrote:
>>> On Sat, Jun 24, 2023, at 03:55, Guenter Roeck wrote:
>>>>
>>>> ERROR: modpost: "__xchg_called_with_bad_pointer" [lib/atomic64_test.ko]
>>>> undefined!
>>> 
>>> These all look like old bugs that would be trivially fixed if
>>> anyone cared about sparc.
>>> 
>>
>> Odd argument, given that this _is_ a sparc patch. Those may be old
>> bugs, but at least in 6.4-rc7 sparc64:allmodconfig does at least compile.
>
> I think we clearly want to fix the fbdev regression you found, and
> maybe bisect the atomic64_test as well to see if that was caused by
> a recent patch to get it into a working state again.

I have bisected this as well now and sent a trivial fix, see
https://lore.kernel.org/lkml/20230628094938.2318171-1-arnd@kernel.org/

      Arnd