TIF_KERNEL_FPSTATE
if (test_thread_flag(TIF_KERNEL_FPSTATE))
if (test_tsk_thread_flag(next, TIF_KERNEL_FPSTATE)) {
if (test_thread_flag(TIF_KERNEL_FPSTATE)) {
set_thread_flag(TIF_KERNEL_FPSTATE);
if (!test_thread_flag(TIF_KERNEL_FPSTATE))
clear_thread_flag(TIF_KERNEL_FPSTATE);
WARN_ON(test_thread_flag(TIF_KERNEL_FPSTATE));