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SubjectRe: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb
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On Thu, 2012-05-17 at 18:24 +0200, Peter Zijlstra 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.


Hmm, no, thinking more that does indeed sounds strange, I'll still have
to consider it more carefully, but I think you might have found a bug
there.


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