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

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Date:   Fri, 24 Aug 2018 07:06:51 -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 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.

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

Thanks,
Guenter

---
diff --git a/arch/riscv/include/asm/tlb.h b/arch/riscv/include/asm/tlb.h
index c229509288ea..439dc7072e05 100644
--- a/arch/riscv/include/asm/tlb.h
+++ b/arch/riscv/include/asm/tlb.h
@@ -14,6 +14,10 @@
  #ifndef _ASM_RISCV_TLB_H
  #define _ASM_RISCV_TLB_H

+struct mmu_gather;
+
+static void tlb_flush(struct mmu_gather *tlb);
+
  #include <asm-generic/tlb.h>

  static inline void tlb_flush(struct mmu_gather *tlb)