Hi Andrea, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.0 next-20190306] [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/Andrea-Righi/blkcg-prevent-priority-inversion-problem-during-sync/20190310-020543 config: i386-randconfig-s1-201910 (attached as .config) compiler: gcc-6 (Debian 6.5.0-2) 6.5.0 20181026 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): fs/fs-writeback.c: In function 'sync_inodes_sb': >> fs/fs-writeback.c:2450:2: error: implicit declaration of function 'blkcg_start_wb_wait_on_bdi' [-Werror=implicit-function-declaration] blkcg_start_wb_wait_on_bdi(bdi); ^~~~~~~~~~~~~~~~~~~~~~~~~~ >> fs/fs-writeback.c:2460:2: error: implicit declaration of function 'blkcg_stop_wb_wait_on_bdi' [-Werror=implicit-function-declaration] blkcg_stop_wb_wait_on_bdi(bdi); ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/blkcg_start_wb_wait_on_bdi +2450 fs/fs-writeback.c 2419 2420 /** 2421 * sync_inodes_sb - sync sb inode pages 2422 * @sb: the superblock 2423 * 2424 * This function writes and waits on any dirty inode belonging to this 2425 * super_block. 2426 */ 2427 void sync_inodes_sb(struct super_block *sb) 2428 { 2429 DEFINE_WB_COMPLETION_ONSTACK(done); 2430 struct wb_writeback_work work = { 2431 .sb = sb, 2432 .sync_mode = WB_SYNC_ALL, 2433 .nr_pages = LONG_MAX, 2434 .range_cyclic = 0, 2435 .done = &done, 2436 .reason = WB_REASON_SYNC, 2437 .for_sync = 1, 2438 }; 2439 struct backing_dev_info *bdi = sb->s_bdi; 2440 2441 /* 2442 * Can't skip on !bdi_has_dirty() because we should wait for !dirty 2443 * inodes under writeback and I_DIRTY_TIME inodes ignored by 2444 * bdi_has_dirty() need to be written out too. 2445 */ 2446 if (bdi == &noop_backing_dev_info) 2447 return; 2448 WARN_ON(!rwsem_is_locked(&sb->s_umount)); 2449 > 2450 blkcg_start_wb_wait_on_bdi(bdi); 2451 2452 /* protect against inode wb switch, see inode_switch_wbs_work_fn() */ 2453 bdi_down_write_wb_switch_rwsem(bdi); 2454 bdi_split_work_to_wbs(bdi, &work, false); 2455 wb_wait_for_completion(bdi, &done); 2456 bdi_up_write_wb_switch_rwsem(bdi); 2457 2458 wait_sb_inodes(sb); 2459 > 2460 blkcg_stop_wb_wait_on_bdi(bdi); 2461 } 2462 EXPORT_SYMBOL(sync_inodes_sb); 2463 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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