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 :::::: CC: Nicolas Pitre --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation