Hi, I was trying to upgrade from v5.0 -> v5.1 on PowerBook G4, but when trying to kexec a kernel the system gets stuck (no errors seen on the console).
Bisected to: 93c4a162b014 ("powerpc/6xx: Store PGDIR physical address in a SPRG"). This commit doesn't revert cleanly anymore but I tested that the one before works OK. With current Linus HEAD (9c7db5004280), it gets a bit further but still doesn't work: now I get an error on the console after kexec "Starting new kernel! ... Bye!": kernel tried to execute exec-protected page (...) - exploit attempt? A.