kernel/cpu/fpu.c

11 int init_fpu(struct task_struct *tsk)
13 	if (tsk_used_math(tsk)) {
14 		if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
15 			unlazy_fpu(tsk, task_pt_regs(tsk));
22 	if (!tsk->thread.xstate) {
23 		tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
25 		if (!tsk->thread.xstate)
30 		struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu;
34 		struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu;
39 	set_stopped_child_used_math(tsk);
46 	struct task_struct *tsk = current;
48 	restore_fpu(tsk);
50 	task_thread_info(tsk)->status |= TS_USEDFPU;
51 	tsk->thread.fpu_counter++;
56 	struct task_struct *tsk = current;
64 	if (!tsk_used_math(tsk)) {
70 		ret = init_fpu(tsk);