linux-kernel - Re: [PATCH] asm-generic/cmpxchg: use BUILD_BUG() when detect unfit, {cmp}xchg size

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Date:	Tue, 23 Feb 2016 18:05:39 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Pan Xinhui <xinhui@...ux.vnet.ibm.com>
Cc:	kbuild-all@...org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] asm-generic/cmpxchg: use BUILD_BUG() when detect unfit,
 {cmp}xchg size

Hi pan,

[auto build test ERROR on v4.5-rc5]
[also build test ERROR on next-20160223]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Pan-Xinhui/asm-generic-cmpxchg-use-BUILD_BUG-when-detect-unfit-cmp-xchg-size/20160223-164522
config: parisc-c3000_defconfig (attached as .config)
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=parisc 

All errors (new ones prefixed by >>):

   In file included from arch/parisc/include/asm/cmpxchg.h:81:0,
                    from arch/parisc/include/asm/atomic.h:9,
                    from include/linux/atomic.h:4,
                    from arch/parisc/include/asm/bitops.h:12,
                    from include/linux/bitops.h:36,
                    from include/linux/kernel.h:10,
                    from arch/parisc/include/asm/bug.h:4,
                    from include/linux/bug.h:4,
                    from include/linux/page-flags.h:9,
                    from kernel/bounds.c:9:
   include/asm-generic/cmpxchg-local.h: In function '__cmpxchg_local_generic':
>> include/asm-generic/cmpxchg-local.h:21:3: error: implicit declaration of function 'BUILD_BUG' [-Werror=implicit-function-declaration]
      BUILD_BUG();
      ^
   cc1: some warnings being treated as errors
   make[2]: *** [kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/BUILD_BUG +21 include/asm-generic/cmpxchg-local.h

    15		unsigned long flags, prev;
    16	
    17		/*
    18		 * Sanity checking, compile-time.
    19		 */
    20		if (size == 8 && sizeof(unsigned long) != 8)
  > 21			BUILD_BUG();
    22	
    23		raw_local_irq_save(flags);
    24		switch (size) {

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Download attachment ".config.gz" of type "application/octet-stream" (13835 bytes)