x86/mm/cpa: Use flush_tlb_all()
Instead of open-coding it.. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NDave Hansen <dave.hansen@intel.com> Cc: Bin Yang <bin.yang@intel.com> Cc: Mark Gross <mark.gross@intel.com> Link: https://lkml.kernel.org/r/20180919085947.831102058@infradead.org
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