UPT_SP             22 arch/um/include/asm/ptrace-generic.h #define PT_REGS_SP(r) UPT_SP(&(r)->regs)
UPT_SP            156 arch/um/kernel/trap.c 		(void *)UPT_IP(regs), (void *)UPT_SP(regs),
UPT_SP             19 arch/x86/um/asm/processor.h        (address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(&current->thread.regs.regs))