Messages in this thread | | | Date | Fri, 24 Aug 2018 16:32:12 -0700 (PDT) | Subject | Re: [RFC PATCH 2/2] mm: mmu_notifier fix for tlb_end_vma (build failures) | From | Palmer Dabbelt <> |
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On Fri, 24 Aug 2018 06:50:48 PDT (-0700), Will Deacon wrote: > 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.
FWIW, Arnd built them last time he updated the cross tools so you should be able to get GCC 8.1.0 for RISC-V from there. I use this make.cross script that I stole from the Intel 0-day robot
https://github.com/palmer-dabbelt/home/blob/master/.local/src/local-scripts/make.cross.bash
If I'm reading it correctly the tools come from here
http://cdn.kernel.org/pub/tools/crosstool/files/bin/x86_64/8.1.0/x86_64-gcc-8.1.0-nolibc-riscv64-linux.tar.gz
I use the make.cross script as it makes it super easy to test my across-the-tree patches on other people's ports.
>> >> 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
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