> Il giorno 19 giu 2017, alle ore 09:38, kbuild test robot <lkp@xxxxxxxxx> ha scritto: > > Hi Paolo, > > [auto build test WARNING on v4.12-rc5] > [also build test WARNING on next-20170616] > [cannot apply to block/for-next] > [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/Paolo-Valente/block-bfq-update-wr_busy_queues-if-needed-on-a-queue-split/20170619-145003 > config: i386-randconfig-x000-201725 (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=i386 > > Note: it may well be a FALSE warning. FWIW you are at least aware of it now. > http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings > > All warnings (new ones prefixed by >>): > > block/bfq-iosched.c: In function 'bfq_get_rq_private': >>> block/bfq-iosched.c:770:10: warning: 'old_wr_coeff' may be used uninitialized in this function [-Wmaybe-uninitialized] > else if (old_wr_coeff > 1 && bfqq->wr_coeff == 1) > ^ > block/bfq-iosched.c:731:15: note: 'old_wr_coeff' was declared here > unsigned int old_wr_coeff; > ^~~~~~~~~~~~ > I'm sending a V2, (probably imperceptibly) slower on average, but not confusing the compiler. Thanks, Paolo > vim +/old_wr_coeff +770 block/bfq-iosched.c > > 754 time_is_before_jiffies(bfqq->last_wr_start_finish + > 755 bfqq->wr_cur_max_time))) { > 756 bfq_log_bfqq(bfqq->bfqd, bfqq, > 757 "resume state: switching off wr"); > 758 > 759 bfqq->wr_coeff = 1; > 760 } > 761 > 762 /* make sure weight will be updated, however we got here */ > 763 bfqq->entity.prio_changed = 1; > 764 > 765 if (likely(!busy)) > 766 return; > 767 > 768 if (old_wr_coeff == 1 && bfqq->wr_coeff > 1) > 769 bfqd->wr_busy_queues++; >> 770 else if (old_wr_coeff > 1 && bfqq->wr_coeff == 1) > 771 bfqd->wr_busy_queues--; > 772 } > 773 > 774 static int bfqq_process_refs(struct bfq_queue *bfqq) > 775 { > 776 return bfqq->ref - bfqq->allocated - bfqq->entity.on_st; > 777 } > 778 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation > <.config.gz>
