linux-kernel - Re: [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF

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Date:   Sun, 11 Sep 2016 12:31:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-mips@...ux-mips.org, Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Helge Deller <deller@....de>, x86@...nel.org,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Matthew Wilcox <willy@...ux.intel.com>,
        Matt Turner <mattst88@...il.com>, Borislav Petkov <bp@...e.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Ming Lin <ming.l@....samsung.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will.deacon@....com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Richard Henderson <rth@...ddle.net>,
        linux-snps-arc@...ts.infradead.org, linux-parisc@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        linux-alpha@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] atomic64: No need for
 CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

Hi Vineet,

[auto build test ERROR on arm64/for-next/core]
[cannot apply to linus/master linux/master v4.8-rc5 next-20160909]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Vineet-Gupta/atomic64-No-need-for-CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE/20160909-013936
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   lib/atomic64_test.c: In function 'test_atomic64':
>> lib/atomic64_test.c:217:2: error: implicit declaration of function 'atomic64_dec_if_positive' [-Werror=implicit-function-declaration]
     BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
     ^
   cc1: some warnings being treated as errors

vim +/atomic64_dec_if_positive +217 lib/atomic64_test.c

86a89380 Luca Barbieri 2010-02-24  211  	INIT(v0);
9efbcd59 Luca Barbieri 2010-03-01  212  	BUG_ON(!atomic64_add_unless(&v, one, v1));
86a89380 Luca Barbieri 2010-02-24  213  	r += one;
86a89380 Luca Barbieri 2010-02-24  214  	BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24  215  
86a89380 Luca Barbieri 2010-02-24  216  	INIT(onestwos);
86a89380 Luca Barbieri 2010-02-24 @217  	BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
86a89380 Luca Barbieri 2010-02-24  218  	r -= one;
86a89380 Luca Barbieri 2010-02-24  219  	BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24  220  

:::::: The code at line 217 was first introduced by commit
:::::: 86a8938078a8bb518c5376de493e348c7490d506 lib: Add self-test for atomic64_t

:::::: TO: Luca Barbieri <luca@...a-barbieri.com>
:::::: CC: H. Peter Anvin <hpa@...or.com>

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