FUTEX_OP_OPARG_SHIFT   52 arch/x86/include/asm/futex.h 	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
FUTEX_OP_OPARG_SHIFT   16 include/asm-generic/futex.h 	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))