Paul, I get:
arch/ppc64/include/asm/elf.h:190:8: warning: memset with byte count of -160
when checking ppc64 with sparse.
It looks like it's even correct. I think elf_gregset_t gets set to
elf_gregset_t32, which is why "struct pt_regs" is so much bigger than
elf_gregset_t.
Maybe it's a sparse bug. And maybe it isn't.
Linus