Re: [PATCH 3/4] mm/tlb, x86/mm: Support invalidating TLB caches for RCU_TABLE_FREE

From: Peter Zijlstra
Date: Mon Aug 27 2018 - 04:21:11 EST

On Mon, Aug 27, 2018 at 06:09:50PM +1000, Benjamin Herrenschmidt wrote:

> Sadly our architecture requires a precise match between the page size
> specified in the tlbie instruction and the entry in the TLB or it won't
> be flushed.

Argh.. OK I see. That is rather unfortunate and does seem to require
something along the lines of tlb_remove_check_page_size_change().