fpu__save

Name:Save the FPU state (mark it for reload if necessary):* This only ever gets called for the current task.

Proto:void fpu__save(struct fpu *fpu)

Type:void

Parameter:

Type	Parameter	Name
struct fpu *	fpu

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WARN_ON_FPU(fpu != & fpu)

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Use fpregs_lock() while editing CPU's FPU registers or fpu->state.* A context switch will (and softirq might) save CPU's FPU registers to* fpu->state and set TIF_NEED_FPU_LOAD leaving CPU's FPU registers in* a random state.

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trace_x86_fpu_before_save(fpu)

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If Not test_thread_flag(load FPU on return to userspace ) Then

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If Not These must be called with preempt disabled Then

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copy_kernel_to_fpregs( & @state:* In-memory copy of all FPU registers that we save/restore* over context switches. If the task is using the FPU then* the registers in the FPU are more recent than this state* copy. If the task context-switches away then they get)

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trace_x86_fpu_after_save(fpu)

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fpregs_unlock()

**Caller**
Name	Describe
fpu__prepare_read	This function must be called before we read a task's fpstate
get_xsave_field_ptr	This wraps up the common operations that need to occur when retrieving* data from xsave state. It first ensures that the current task was* using the FPU and retrieves the data in to a buffer. It then calculates
math_error	Note that we play around with the 'TS' bit in an attempt to get* the correct behaviour even in the presence of the asynchronous* IRQ13 behaviour

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