netdev - Re: [PATCH net-next 07/14] tcp: export data delivery rate

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Date:   Sat, 17 Sep 2016 05:38:18 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Neal Cardwell <ncardwell@...gle.com>
Cc:     kbuild-all@...org, David Miller <davem@...emloft.net>,
        netdev@...r.kernel.org, Yuchung Cheng <ycheng@...gle.com>,
        Van Jacobson <vanj@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Nandita Dukkipati <nanditad@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH net-next 07/14] tcp: export data delivery rate

Hi Yuchung,

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Neal-Cardwell/tcp-BBR-congestion-control-algorithm/20160917-025323
config: arm-simpad_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
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=arm 

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:142:0,
                    from include/linux/crypto.h:21,
                    from include/crypto/hash.h:16,
                    from net/ipv4/tcp.c:250:
   net/ipv4/tcp.c: In function 'tcp_get_info':
>> arch/arm/include/asm/div64.h:59:36: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
    #define do_div(n, base) __div64_32(&(n), base)
                                       ^
   net/ipv4/tcp.c:2794:3: note: in expansion of macro 'do_div'
      do_div(rate, intv);
      ^~~~~~
   arch/arm/include/asm/div64.h:32:24: note: expected 'uint64_t * {aka long long unsigned int *}' but argument is of type 'u32 * {aka unsigned int *}'
    static inline uint32_t __div64_32(uint64_t *n, uint32_t base)
                           ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__div64_32 +59 arch/arm/include/asm/div64.h

040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  43  		: "=r" (__rem), "=r" (__res)
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  44  		: "r" (__n), "r" (__base)
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  45  		: "ip", "lr", "cc");
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  46  	*n = __res;
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  47  	return __rem;
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  48  }
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  49  #define __div64_32 __div64_32
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  50  
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  51  #if !defined(CONFIG_AEABI)
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  52  
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  53  /*
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  54   * In OABI configurations, some uses of the do_div function
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  55   * cause gcc to run out of registers. To work around that,
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  56   * we can force the use of the out-of-line version for
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  57   * configurations that build a OABI kernel.
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  58   */
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 @59  #define do_div(n, base) __div64_32(&(n), base)
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  60  
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  61  #else
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  62  
fa4adc614 include/asm-arm/div64.h      Nicolas Pitre 2006-12-06  63  /*
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  64   * gcc versions earlier than 4.0 are simply too problematic for the
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  65   * __div64_const32() code in asm-generic/div64.h. First there is
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  66   * gcc PR 15089 that tend to trig on more complex constructs, spurious
040b323b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02  67   * .global __udivsi3 are inserted even if none of those symbols are

:::::: The code at line 59 was first introduced by commit
:::::: 040b323b5012b5503561ec7fe15cccd6a4bcaec2 ARM: asm/div64.h: adjust to generic codde

:::::: TO: Nicolas Pitre <nicolas.pitre@...aro.org>
:::::: CC: Nicolas Pitre <nicolas.pitre@...aro.org>

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