linux-kernel - Re: [PATCH 1/1] mm/pgtable/debug: Add test validating architecture page table helpers

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Date:   Wed, 4 Sep 2019 11:44:25 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     kbuild test robot <lkp@...el.com>
Cc:     Mark Rutland <mark.rutland@....com>, linux-ia64@...r.kernel.org,
        linux-sh@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        James Hogan <jhogan@...nel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        Paul Mackerras <paulus@...ba.org>, sparclinux@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-s390@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        x86@...nel.org, Russell King - ARM Linux <linux@...linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Steven Price <Steven.Price@....com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-arm-kernel@...ts.infradead.org,
        linux-snps-arc@...ts.infradead.org,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mark Brown <broonie@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        linux-mips@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Paul Burton <paul.burton@...s.com>, kbuild-all@...org,
        Vineet Gupta <vgupta@...opsys.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/1] mm/pgtable/debug: Add test validating architecture
 page table helpers



On 09/03/2019 04:43 PM, kbuild test robot wrote:
> Hi Anshuman,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on linus/master]
> [cannot apply to v5.3-rc7 next-20190902]
> [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/Anshuman-Khandual/mm-debug-Add-tests-for-architecture-exported-page-table-helpers/20190903-162959
> config: m68k-allmodconfig (attached as .config)
> compiler: m68k-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=m68k 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All error/warnings (new ones prefixed by >>):
> 
>    In file included from arch/m68k/include/asm/bug.h:32:0,
>                     from include/linux/bug.h:5,
>                     from include/linux/thread_info.h:12,
>                     from include/asm-generic/preempt.h:5,
>                     from ./arch/m68k/include/generated/asm/preempt.h:1,
>                     from include/linux/preempt.h:78,
>                     from arch/m68k/include/asm/irqflags.h:6,
>                     from include/linux/irqflags.h:16,
>                     from arch/m68k/include/asm/atomic.h:6,
>                     from include/linux/atomic.h:7,
>                     from include/linux/mm_types_task.h:13,
>                     from include/linux/mm_types.h:5,
>                     from include/linux/hugetlb.h:5,
>                     from mm/arch_pgtable_test.c:14:
>    mm/arch_pgtable_test.c: In function 'pmd_clear_tests':
>>> arch/m68k/include/asm/page.h:31:22: error: lvalue required as unary '&' operand
>     #define pmd_val(x) ((&x)->pmd[0])
>                          ^
>    include/asm-generic/bug.h:124:25: note: in definition of macro 'WARN_ON'
>      int __ret_warn_on = !!(condition);    \
>                             ^~~~~~~~~
>>> arch/m68k/include/asm/motorola_pgtable.h:138:26: note: in expansion of macro 'pmd_val'
>     #define pmd_none(pmd)  (!pmd_val(pmd))
>                              ^~~~~~~
>>> mm/arch_pgtable_test.c:233:11: note: in expansion of macro 'pmd_none'
>      WARN_ON(!pmd_none(READ_ONCE(*pmdp)));
>               ^~~~~~~~
>    mm/arch_pgtable_test.c: In function 'pmd_populate_tests':
>>> arch/m68k/include/asm/page.h:31:22: error: lvalue required as unary '&' operand
>     #define pmd_val(x) ((&x)->pmd[0])

Storing READ_ONCE(*pmdp) in a local pmd_t variable first solves the problem.