x86/fpu/signal: Split out the direct restore code
Prepare for smarter failure handling of the direct restore. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121457.493455414@linutronix.de
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