Comment # 21 on bug 1202727 from Petr Tesa������������k

(In reply to Marcos de Souza from comment #20)
> (In reply to Miroslav Bene������ from comment #18)
> > There is commit e3c11025bcd2 ("s390: avoid using global register for
> > current_stack_pointer") now.
> 
> When building with this commit applied, it works. I can boot the built
> kernel.
> 
> My env:
> SLE15-SP1
> gcc 7.5
> 
> I can sucessfully boot kernel v6.1-rc6, which has the commit applied.

This is expected, because it effectively reverts the commit that you bisected
earlier. However, the root cause must be different from what the explanation
given in the upstream commit:

Unfortunately on s390 it uncovers old gcc bug which is fixed only since gcc-9.1
[gcc commit 3ad7fed1cc87].