Commits to address this are upstream in Linus' tree; they are:
1511df6f5e9e ("s390/bpf: Fix branch shortening during codegen pass") 6e61dc9da0b7 ("s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant") db7bee653859 ("s390/bpf: Fix optimizing out zero-extensions")
Commits to address this are upstream in Linus' tree; they are:
1511df6f5e9e ("s390/bpf: Fix branch shortening during codegen pass")
6e61dc9da0b7 ("s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant")
db7bee653859 ("s390/bpf: Fix optimizing out zero-extensions")