x86/fpu: Simplify fpregs_[un]lock()
There is no point in disabling preemption and then disabling bottom halfs. Just disabling bottom halfs is sufficient as it implicitly disables preemption on !RT kernels. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20201027101349.455380473@linutronix.de
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