linux-kernel - lib/atomic64_test.c:217:9: error: implicit declaration of function 'atomic64_dec_if

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Date:   Sun, 9 Oct 2016 22:37:18 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: lib/atomic64_test.c:217:9: error: implicit declaration of function
 'atomic64_dec_if_positive'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b66484cd74706fa8681d051840fe4b18a3da40ff
commit: 51a021244b9d579be6b4f8c15c493a76deb2a79e atomic64: no need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
date:   2 days ago
config: frv-allmodconfig (attached as .config)
compiler: frv-linux-gcc (GCC) 6.2.0
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
        git checkout 51a021244b9d579be6b4f8c15c493a76deb2a79e
        # save the attached .config to linux build tree
        make.cross ARCH=frv 

All errors (new ones prefixed by >>):

   In file included from include/linux/init.h:4:0,
                    from lib/atomic64_test.c:14:
   lib/atomic64_test.c: In function 'test_atomic64':
   lib/atomic64_test.c:208:9: error: implicit declaration of function 'atomic64_add_unless' [-Werror=implicit-function-declaration]
     BUG_ON(atomic64_add_unless(&v, one, v0));
            ^
   include/linux/compiler.h:168:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   lib/atomic64_test.c:208:2: note: in expansion of macro 'BUG_ON'
     BUG_ON(atomic64_add_unless(&v, one, v0));
     ^~~~~~
>> lib/atomic64_test.c:217:9: error: implicit declaration of function 'atomic64_dec_if_positive' [-Werror=implicit-function-declaration]
     BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
            ^
   include/linux/compiler.h:168:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   lib/atomic64_test.c:217:2: note: in expansion of macro 'BUG_ON'
     BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
     ^~~~~~
   lib/atomic64_test.c:230:10: error: implicit declaration of function 'atomic64_inc_not_zero' [-Werror=implicit-function-declaration]
     BUG_ON(!atomic64_inc_not_zero(&v));
             ^
   include/linux/compiler.h:168:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   lib/atomic64_test.c:230:2: note: in expansion of macro 'BUG_ON'
     BUG_ON(!atomic64_inc_not_zero(&v));
     ^~~~~~
   cc1: some warnings being treated as errors

vim +/atomic64_dec_if_positive +217 lib/atomic64_test.c

978e5a36 Boqun Feng    2015-11-04  202  	DEC_RETURN_FAMILY_TEST(64, v0);
86a89380 Luca Barbieri 2010-02-24  203  
978e5a36 Boqun Feng    2015-11-04  204  	XCHG_FAMILY_TEST(64, v0, v1);
978e5a36 Boqun Feng    2015-11-04  205  	CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
86a89380 Luca Barbieri 2010-02-24  206  
86a89380 Luca Barbieri 2010-02-24  207  	INIT(v0);
9efbcd59 Luca Barbieri 2010-03-01 @208  	BUG_ON(atomic64_add_unless(&v, one, v0));
86a89380 Luca Barbieri 2010-02-24  209  	BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24  210  
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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