linux-kernel - Re: [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end

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Date:   Fri, 24 Aug 2018 15:25:33 +0100
From:   Will Deacon <will.deacon@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Nicholas Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        torvalds@...ux-foundation.org, luto@...nel.org, x86@...nel.org,
        bp@...en8.de, riel@...riel.com, jannh@...gle.com,
        ascannell@...gle.com, dave.hansen@...el.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        David Miller <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arch@...r.kernel.org, Palmer Dabbelt <palmer@...ive.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma (build
 failures)

On Fri, Aug 24, 2018 at 07:06:51AM -0700, Guenter Roeck wrote:
> On 08/24/2018 06:50 AM, Will Deacon wrote:
> 
> >>-#include <asm-generic/tlb.h>
> >>+struct mmu_gather;
> >>  static inline void tlb_flush(struct mmu_gather *tlb)
> >>  {
> >>  	flush_tlb_mm(tlb->mm);
> >
> >Bah, didn't spot the dereference so this won't work either. You basically
> >just need to copy what I did for arm64 in d475fac95779.
> >
> 
> Yes, this seems to work. It doesn't really need "struct mmu_gather;" -
> I assume that is included from elsewhere - but I added it to be safe.

struct mmu_gather comes in via asm-generic/tlb.h.

> Can you send a full patch, or do you want me to do it ?

I'm evidently incapable of writing code today, so please go ahead :)

Will