Hi, [auto build test ERROR on tip/sched/core] [also build test ERROR on v4.7 next-20160726] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Giovanni-Gherdovich/sched-cputime-Mitigate-performance-regression-in-times-clock_gettime/20160726-221216 config: mips-allyesconfig (attached as .config) compiler: mips-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609 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=mips All errors (new ones prefixed by >>): kernel/sched/core.c: In function 'task_sched_runtime': >> kernel/sched/core.c:3009:3: error: implicit declaration of function >> 'prefetch' [-Werror=implicit-function-declaration] prefetch((&p->se)->cfs_rq->curr); ^ cc1: some warnings being treated as errors make[2]: *** [kernel/sched/core.o] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [kernel/sched/] Error 2 vim +/prefetch +3009 kernel/sched/core.c 3003 * Must be ->curr _and_ ->on_rq. If dequeued, we would 3004 * project cycles that may never be accounted to this 3005 * thread, breaking clock_gettime(). 3006 */ 3007 if (task_current(rq, p) && task_on_rq_queued(p)) { 3008 #if defined(CONFIG_FAIR_GROUP_SCHED) > 3009 prefetch((&p->se)->cfs_rq->curr); 3010 prefetch(&(&p->se)->cfs_rq->curr->exec_start); 3011 #endif 3012 update_rq_clock(rq); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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