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

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Date:   Fri, 24 Aug 2018 11:22:59 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Will Deacon <will.deacon@....com>
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 03:25:33PM +0100, Will Deacon wrote:
> 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.
> 
>From linux/mm.h, really, which happens to be included before
asm/tlb.h is included (see arch/riscv/include/asm/pgalloc.h).
I kept it to be future-proof.

> > 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 :)
> 
Done. We'll see if I am any better.

Guenter