Re: am335x: 5.18.x: system stalling

[Arnd Bergmann <arnd@arndb.de>]

On Sat, May 28, 2022 at 9:28 PM Yegor Yefremov
<yegorslists@googlemail.com> wrote:
>
> On Sat, May 28, 2022 at 3:14 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > On Sat, May 28, 2022 at 3:01 PM Yegor Yefremov
> > <yegorslists@googlemail.com> wrote:
> > > On Sat, May 28, 2022 at 11:07 AM Ard Biesheuvel <ardb@kernel.org> wrote:
> > > In file included from ./include/linux/irqflags.h:17,
> > >                  from ./arch/arm/include/asm/bitops.h:28,
> > >                  from ./include/linux/bitops.h:33,
> > >                  from ./include/linux/log2.h:12,
> > >                  from kernel/bounds.c:13:
> > > ./arch/arm/include/asm/percpu.h: In function ‘__my_cpu_offset’:
> > > ./arch/arm/include/asm/percpu.h:32:9: error: ‘__per_cpu_offset’
> > > undeclared (first use in this function); did you mean
> > > ‘__my_cpu_offset’?
> > >    32 |  return __per_cpu_offset[0];
> > >       |         ^~~~~~~~~~~~~~~~
> > >       |         __my_cpu_offset
> > > ./arch/arm/include/asm/percpu.h:32:9: note: each undeclared identifier
> > > is reported only once for each function it appears in
> >
> > I think you just missed the line in my patch that adds the
> > "extern unsigned long __per_cpu_offset[];" variable declaration.
>
> So, I tried both variants and both led to stalls.

I'm running out of ideas here.  Going to back to the original bisection,
I rebased Ard's patches in a way that you should be able to build the
config for each patch, and I split up the "ARM: implement
THREAD_INFO_IN_TASK for uniprocessor systems" commit in yet
another way, hoping to get something left over that points to the
bug. Can you try bisecting through the top commits of

https://kernel.org/pub/scm/linux/kernel/git/soc/soc.git am335x-stall-test

starting maybe with "52d240871760 irqchip: nvic: Use
GENERIC_IRQ_MULTI_HANDLER" as the patch that is almost certainly
going to be ok?

At some point I fear we may have to give up and just mark the v6+SMP
configuration as broken, which is something we have considered in the
past but ended up always keeping around for the purpose of testing
omap2plus_defconfig and imx_v6_v7_defconfig. Note that on production
systems you probably don't want to use that config anway, and should
either stick to a uniprocessor build, or disable the ARMv6 support.

         Arnd

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