Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb

[Martin Schwidefsky]

On Thu, 17 May 2012 18:24:44 +0200
Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:

> On Thu, 2012-05-17 at 17:00 +0100, Catalin Marinas wrote:
> 
> > BTW, looking at your tlb-unify branch, does tlb_remove_table() call
> > tlb_flush/tlb_flush_mmu before freeing the tables?  I can only see
> > tlb_remove_page() doing this. On ARM, even UP, we need the TLB flushing
> > after clearing the pmd and before freeing the pte page table (and
> > ideally doing it less often than at every pte_free_tlb() call).
> 
> No I don't think it does, so far the only archs using the RCU stuff are
> ppc,sparc and s390 and none of those needed that (Xen might join them
> soon though). But I will have to look and consider this more carefully.
> I 'lost' most of the ppc/sparc/s390 details from memory to say this with
> any certainty.
 
s390 needs a TLB flush for the pgd, pud and pmd tables. See git commit
cd94154cc6a28dd9dc271042c1a59c08d26da886 for the sad details.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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