kernel since 5.6 do not boot anymore on Apple PowerBook

[Giuseppe Sacco]

Hello Cristophe,

Il giorno mar, 07/07/2020 alle 17.34 +0200, Giuseppe Sacco ha scritto:
> Il giorno mar, 07/07/2020 alle 16.52 +0200, Christophe Leroy ha
> scritto:
> > Le 07/07/2020 à 16:03, Giuseppe Sacco a écrit :
> > > Hello Cristophe,
> > > 
> > > > Can you tell which defconfig you use or provide your .config
> > > 
> > > You may get the standard one from debian or a reduced one that I
> > > made on purpose. The latter is here:
> > > https://eppesuigoccas.homedns.org/~giuseppe/config-5.4.50.gz
> > > 
> > >  (boot)
> > > https://eppesuigoccas.homedns.org/~giuseppe/config-5.6.19.gz
> > > 
> > >  (no boot)
> > 
> > Thanks
> > 
> > Can you provide the complete output when it works, so that I can
> > see 
> > what is after the place it stops when it fails.
> 
> Here it is:
> https://eppesuigoccas.homedns.org/~giuseppe/dmesg-5.4.40-minimo.gz
> 
> 
> > And can you try without CONFIG_VMAP_STACK on 5.6.19
> 
> Sure, I'll let you know.

No, this change did not make the kernel boot. I only changed the option
you proposed:

$ grep VMAP .config 
CONFIG_HAVE_ARCH_VMAP_STACK=y
# CONFIG_VMAP_STACK is not set

Thanks,
Giuseppe