linux-kernel - Re: [PATCH 2/2] writeback: Rework wb_[dec|inc]

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Date:   Wed, 21 Jun 2017 08:05:55 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nikolay Borisov <nborisov@...e.com>
Cc:     kbuild-all@...org, tj@...nel.org, jbacik@...com, jack@...e.cz,
        linux-kernel@...r.kernel.org, hannes@...xchg.org,
        mgorman@...hsingularity.net, Nikolay Borisov <nborisov@...e.com>
Subject: Re: [PATCH 2/2] writeback: Rework wb_[dec|inc]_stat family of
 functions

Hi Nikolay,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc6 next-20170620]
[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/Nikolay-Borisov/percpu_counter-Rename-__percpu_counter_add-to-percpu_counter_add_batch/20170621-045738
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   fs/fs-writeback.c: In function 'inode_switch_wbs_work_fn':
>> fs/fs-writeback.c:383:4: error: implicit declaration of function '__dec_wb_stat' [-Werror=implicit-function-declaration]
       __dec_wb_stat(old_wb, WB_RECLAIMABLE);
       ^~~~~~~~~~~~~
>> fs/fs-writeback.c:384:4: error: implicit declaration of function '__inc_wb_stat' [-Werror=implicit-function-declaration]
       __inc_wb_stat(new_wb, WB_RECLAIMABLE);
       ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__dec_wb_stat +383 fs/fs-writeback.c

d10c8095 Tejun Heo 2015-05-28  377  	 */
d10c8095 Tejun Heo 2015-05-28  378  	radix_tree_for_each_tagged(slot, &mapping->page_tree, &iter, 0,
d10c8095 Tejun Heo 2015-05-28  379  				   PAGECACHE_TAG_DIRTY) {
d10c8095 Tejun Heo 2015-05-28  380  		struct page *page = radix_tree_deref_slot_protected(slot,
d10c8095 Tejun Heo 2015-05-28  381  							&mapping->tree_lock);
d10c8095 Tejun Heo 2015-05-28  382  		if (likely(page) && PageDirty(page)) {
d10c8095 Tejun Heo 2015-05-28 @383  			__dec_wb_stat(old_wb, WB_RECLAIMABLE);
d10c8095 Tejun Heo 2015-05-28 @384  			__inc_wb_stat(new_wb, WB_RECLAIMABLE);
d10c8095 Tejun Heo 2015-05-28  385  		}
d10c8095 Tejun Heo 2015-05-28  386  	}
d10c8095 Tejun Heo 2015-05-28  387  

:::::: The code at line 383 was first introduced by commit
:::::: d10c809552659d8a0089062b9d73da6d47e84cbf writeback: implement foreign cgroup inode bdi_writeback switching

:::::: TO: Tejun Heo <tj@...nel.org>
:::::: CC: Jens Axboe <axboe@...com>

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