linux-kernel - RE: [PATCH v4 3/3] mm: fix double page fault on arm64 if PTE

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Date:   Thu, 19 Sep 2019 01:46:31 +0000
From:   "Justin He (Arm Technology China)" <Justin.He@....com>
To:     kbuild test robot <lkp@...el.com>
CC:     "kbuild-all@...org" <kbuild-all@...org>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        James Morse <James.Morse@....com>,
        Marc Zyngier <maz@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Punit Agrawal <punitagrawal@...il.com>,
        Anshuman Khandual <Anshuman.Khandual@....com>,
        Jun Yao <yaojun8558363@...il.com>,
        Alex Van Brunt <avanbrunt@...dia.com>,
        Robin Murphy <Robin.Murphy@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        "hejianet@...il.com" <hejianet@...il.com>,
        "Kaly Xin (Arm Technology China)" <Kaly.Xin@....com>
Subject: RE: [PATCH v4 3/3] mm: fix double page fault on arm64 if PTE_AF is
 cleared



> -----Original Message-----
> From: kbuild test robot <lkp@...el.com>
> Sent: 2019年9月19日 3:36
> To: Justin He (Arm Technology China) <Justin.He@....com>
> Cc: kbuild-all@...org; Catalin Marinas <Catalin.Marinas@....com>; Will
> Deacon <will@...nel.org>; Mark Rutland <Mark.Rutland@....com>;
> James Morse <James.Morse@....com>; Marc Zyngier <maz@...nel.org>;
> Matthew Wilcox <willy@...radead.org>; Kirill A. Shutemov
> <kirill.shutemov@...ux.intel.com>; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; linux-mm@...ck.org; Suzuki Poulose
> <Suzuki.Poulose@....com>; Punit Agrawal <punitagrawal@...il.com>;
> Anshuman Khandual <Anshuman.Khandual@....com>; Jun Yao
> <yaojun8558363@...il.com>; Alex Van Brunt <avanbrunt@...dia.com>;
> Robin Murphy <Robin.Murphy@....com>; Thomas Gleixner
> <tglx@...utronix.de>; Andrew Morton <akpm@...ux-foundation.org>;
> jglisse@...hat.com; Ralph Campbell <rcampbell@...dia.com>;
> hejianet@...il.com; Kaly Xin (Arm Technology China)
> <Kaly.Xin@....com>; Justin He (Arm Technology China)
> <Justin.He@....com>
> 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@...el.com>
>
> 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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