From: Will Deacon <will.deacon@arm.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Nicholas Piggin <npiggin@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
torvalds@linux-foundation.org, luto@kernel.org, x86@kernel.org,
bp@alien8.de, riel@surriel.com, jannh@google.com,
ascannell@google.com, dave.hansen@intel.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
linux-arch@vger.kernel.org, Palmer Dabbelt <palmer@sifive.com>,
linux-riscv@lists.infradead.org
Subject: Re: [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma (build failures)
Date: Fri, 24 Aug 2018 14:50:48 +0100 [thread overview]
Message-ID: <20180824135048.GF11868@brain-police> (raw)
Message-ID: <20180824135048.TFlIfZnxEvZrHZLfSQIbGYDdOZ4X94AeJF6qKxj3gCA@z> (raw)
In-Reply-To: <20180824133427.GC11868@brain-police>
On Fri, Aug 24, 2018 at 02:34:27PM +0100, Will Deacon wrote:
> On Fri, Aug 24, 2018 at 06:24:19AM -0700, Guenter Roeck wrote:
> > On Fri, Aug 24, 2018 at 02:10:27PM +0100, Will Deacon wrote:
> > > On Fri, Aug 24, 2018 at 06:07:22AM -0700, Guenter Roeck wrote:
> > > > On Thu, Aug 23, 2018 at 06:47:09PM +1000, Nicholas Piggin wrote:
> > > > > The generic tlb_end_vma does not call invalidate_range mmu notifier,
> > > > > and it resets resets the mmu_gather range, which means the notifier
> > > > > won't be called on part of the range in case of an unmap that spans
> > > > > multiple vmas.
> > > > >
> > > > > ARM64 seems to be the only arch I could see that has notifiers and
> > > > > uses the generic tlb_end_vma. I have not actually tested it.
> > > > >
> > > > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> > > > > Acked-by: Will Deacon <will.deacon@arm.com>
> > > >
> > > > This patch breaks riscv builds in mainline.
> > >
> > > Looks very similar to the breakage we hit on arm64. diff below should fix
> > > it.
> > >
> >
> > Unfortunately it doesn't.
> >
> > In file included from ./arch/riscv/include/asm/pgtable.h:26:0,
> > from ./include/linux/memremap.h:7,
> > from ./include/linux/mm.h:27,
> > from arch/riscv/mm/fault.c:23:
> > ./arch/riscv/include/asm/tlb.h: In function ‘tlb_flush’:
> > ./arch/riscv/include/asm/tlb.h:19:18: error: dereferencing pointer to incomplete type ‘struct mmu_gather’
> > flush_tlb_mm(tlb->mm);
> > ^
>
> Sorry, I was a bit quick of the mark there. You'll need a forward
> declaration for the paramater type. Here it is with a commit message,
> although still untested because I haven't got round to setting up a riscv
> toolchain yet.
>
> Will
>
> --->8
>
> From adb9be33d68320edcda80d540a97a647792894d2 Mon Sep 17 00:00:00 2001
> From: Will Deacon <will.deacon@arm.com>
> Date: Fri, 24 Aug 2018 14:33:48 +0100
> Subject: [PATCH] riscv: tlb: Provide definition of tlb_flush() before
> including tlb.h
>
> As of commit fd1102f0aade ("mm: mmu_notifier fix for tlb_end_vma"),
> asm-generic/tlb.h now calls tlb_flush() from a static inline function,
> so we need to make sure that it's declared before #including the
> asm-generic header in the arch header.
>
> Since tlb_flush() is a one-liner for riscv, we can define it before
> including asm-generic/tlb.h as long as we provide a forward declaration
> of struct mmu_gather.
>
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
> ---
> arch/riscv/include/asm/tlb.h | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/tlb.h b/arch/riscv/include/asm/tlb.h
> index c229509288ea..a3d1380ad970 100644
> --- a/arch/riscv/include/asm/tlb.h
> +++ b/arch/riscv/include/asm/tlb.h
> @@ -14,11 +14,13 @@
> #ifndef _ASM_RISCV_TLB_H
> #define _ASM_RISCV_TLB_H
>
> -#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.
Will
next prev parent reply other threads:[~2018-08-24 17:25 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 8:47 [RFC PATCH 0/2] minor mmu_gather patches Nicholas Piggin
2018-08-23 8:47 ` Nicholas Piggin
2018-08-23 8:47 ` [RFC PATCH 1/2] mm: move tlb_table_flush to tlb_flush_mmu_free Nicholas Piggin
2018-08-23 8:47 ` Nicholas Piggin
2018-08-23 13:40 ` Will Deacon
2018-08-23 13:40 ` Will Deacon
2018-09-06 20:29 ` Rik van Riel
2018-09-06 20:29 ` Rik van Riel
2018-09-07 13:44 ` Will Deacon
2018-09-07 13:44 ` Will Deacon
2018-09-07 14:28 ` Rik van Riel
2018-09-07 14:28 ` Rik van Riel
2018-08-23 8:47 ` [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma Nicholas Piggin
2018-08-23 8:47 ` Nicholas Piggin
2018-08-23 12:46 ` Catalin Marinas
2018-08-23 12:46 ` Catalin Marinas
2018-08-23 13:41 ` Will Deacon
2018-08-23 13:41 ` Will Deacon
2018-08-24 13:07 ` [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma (build failures) Guenter Roeck
2018-08-24 13:07 ` Guenter Roeck
2018-08-24 13:10 ` Will Deacon
2018-08-24 13:10 ` Will Deacon
2018-08-24 13:24 ` Guenter Roeck
2018-08-24 13:24 ` Guenter Roeck
2018-08-24 13:34 ` Will Deacon
2018-08-24 13:34 ` Will Deacon
2018-08-24 13:50 ` Will Deacon [this message]
2018-08-24 13:50 ` Will Deacon
2018-08-24 13:54 ` Guenter Roeck
2018-08-24 13:54 ` Guenter Roeck
2018-08-24 14:06 ` Guenter Roeck
2018-08-24 14:06 ` Guenter Roeck
2018-08-24 14:25 ` Will Deacon
2018-08-24 14:25 ` Will Deacon
2018-08-24 18:22 ` Guenter Roeck
2018-08-24 18:22 ` Guenter Roeck
2018-08-24 23:32 ` Palmer Dabbelt
2018-08-24 23:32 ` Palmer Dabbelt
2018-08-23 19:15 ` [RFC PATCH 0/2] minor mmu_gather patches Linus Torvalds
2018-08-23 19:15 ` Linus Torvalds
2018-08-23 19:37 ` Linus Torvalds
2018-08-23 19:37 ` Linus Torvalds
2018-08-23 23:27 ` Will Deacon
2018-08-23 23:27 ` Will Deacon
2018-08-23 23:42 ` Nicholas Piggin
2018-08-23 23:42 ` Nicholas Piggin
2018-08-23 23:35 ` Nicholas Piggin
2018-08-23 23:35 ` Nicholas Piggin
2018-08-24 8:05 ` Peter Zijlstra
2018-08-24 8:05 ` Peter Zijlstra
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