RE: [PATCH v4 3/3] mm: fix double page fault on arm64 if PTE_AF is cleared

[Justin He (Arm Technology China)]

> -----Original Message-----
> From: kbuild test robot <lkp@xxxxxxxxx>
> Sent: 2019年9月19日 3:36
> To: Justin He (Arm Technology China) <Justin.He@xxxxxxx>
> Cc: kbuild-all@xxxxxx; Catalin Marinas <Catalin.Marinas@xxxxxxx>; Will
> Deacon <will@xxxxxxxxxx>; Mark Rutland <Mark.Rutland@xxxxxxx>;
> James Morse <James.Morse@xxxxxxx>; Marc Zyngier <maz@xxxxxxxxxx>;
> Matthew Wilcox <willy@xxxxxxxxxxxxx>; Kirill A. Shutemov
> <kirill.shutemov@xxxxxxxxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; Suzuki Poulose
> <Suzuki.Poulose@xxxxxxx>; Punit Agrawal <punitagrawal@xxxxxxxxx>;
> Anshuman Khandual <Anshuman.Khandual@xxxxxxx>; Jun Yao
> <yaojun8558363@xxxxxxxxx>; Alex Van Brunt <avanbrunt@xxxxxxxxxx>;
> Robin Murphy <Robin.Murphy@xxxxxxx>; Thomas Gleixner
> <tglx@xxxxxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>;
> jglisse@xxxxxxxxxx; Ralph Campbell <rcampbell@xxxxxxxxxx>;
> hejianet@xxxxxxxxx; Kaly Xin (Arm Technology China)
> <Kaly.Xin@xxxxxxx>; Justin He (Arm Technology China)
> <Justin.He@xxxxxxx>
> Subject: Re: [PATCH v4 3/3] mm: fix double page fault on arm64 if PTE_AF
> is cleared
>
> Hi Jia,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [cannot apply to v5.3 next-20190917]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Jia-He/fix-double-page-
> fault-on-arm64/20190918-220036
> config: arm64-allnoconfig (attached as .config)
> compiler: aarch64-linux-gcc (GCC) 7.4.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-
> tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.4.0 make.cross ARCH=arm64
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
>
> All errors (new ones prefixed by >>):
>
>    mm/memory.o: In function `wp_page_copy':
> >> memory.c:(.text+0x8fc): undefined reference to `cpu_has_hw_af'
>    memory.c:(.text+0x8fc): relocation truncated to fit: R_AARCH64_CALL26
> against undefined symbol `cpu_has_hw_af'
>
Ah, I should add a stub for CONFIG_ARM64_HW_AFDBM is 'N' on arm64 arch
Will fix it asap

--
Cheers,
Justin (Jia He)


> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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