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SubjectRe: [PATCH v3] blkcg: prevent priority inversion problem during sync()
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: riscv-tinyconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 8.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.2.0 make.cross ARCH=riscv

All errors (new ones prefixed by >>):

fs/sync.c: In function 'sync_fs_one_sb':
>> fs/sync.c:83:3: error: implicit declaration of function 'blkcg_start_wb_wait_on_bdi' [-Werror=implicit-function-declaration]
blkcg_start_wb_wait_on_bdi(bdi);
^~~~~~~~~~~~~~~~~~~~~~~~~~
>> fs/sync.c:85:3: 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 +83 fs/sync.c

77
78 static void sync_fs_one_sb(struct super_block *sb, void *arg)
79 {
80 struct backing_dev_info *bdi = sb->s_bdi;
81
82 if (!sb_rdonly(sb) && sb->s_op->sync_fs) {
> 83 blkcg_start_wb_wait_on_bdi(bdi);
84 sb->s_op->sync_fs(sb, *(int *)arg);
> 85 blkcg_stop_wb_wait_on_bdi(bdi);
86 }
87 }
88

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