futex: split out futex value validation code
Refactor the code to validate the expected futex value in order to reuse it with the requeue_pi code. Signed-off-by: NDarren Hart <dvhltc@us.ibm.com> Reviewed-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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