Hi Shaohua, [auto build test ERROR on linus/master] [also build test ERROR on v4.12-rc5] [cannot apply to driver-core/driver-core-testing block/for-next next-20170615] [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/Shaohua-Li/kernfs-implement-i_generation/20170615-211524 config: x86_64-randconfig-x014-201724 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): block/bfq-cgroup.c: In function 'bfq_bic_update_cgroup': >> block/bfq-cgroup.c:679:2: error: implicit declaration of function 'blkg_path' [-Werror=implicit-function-declaration] blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); ^~~~~~~~~ cc1: some warnings being treated as errors vim +/blkg_path +679 block/bfq-cgroup.c 8f9bebc3 Paolo Valente 2017-06-05 673 * Finally, note that bfqg itself needs to be protected from 8f9bebc3 Paolo Valente 2017-06-05 674 * destruction on the blkg_free of the original blkg (which 8f9bebc3 Paolo Valente 2017-06-05 675 * invokes bfq_pd_free). We use an additional private 8f9bebc3 Paolo Valente 2017-06-05 676 * refcounter for bfqg, to let it disappear only after no 8f9bebc3 Paolo Valente 2017-06-05 677 * bfq_queue refers to it any longer. 8f9bebc3 Paolo Valente 2017-06-05 678 */ 8f9bebc3 Paolo Valente 2017-06-05 @679 blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); ea25da48 Paolo Valente 2017-04-19 680 bic->blkcg_serial_nr = serial_nr; ea25da48 Paolo Valente 2017-04-19 681 out: ea25da48 Paolo Valente 2017-04-19 682 rcu_read_unlock(); :::::: The code at line 679 was first introduced by commit :::::: 8f9bebc33dd718283183582fc4a762e178552fb8 block, bfq: access and cache blkg data only when safe :::::: TO: Paolo Valente <paolo.valente@xxxxxxxxxx> :::::: CC: Jens Axboe <axboe@xxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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