linux-kernel - Re: [PATCH for-6.2/block V3 2/2] block: Change the granularity of io ticks from ms to ns

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Date:   Thu, 22 Dec 2022 06:54:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Gulam Mohamed <gulam.mohamed@...cle.com>,
        linux-block@...r.kernel.org
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        axboe@...nel.dk, philipp.reisner@...bit.com,
        lars.ellenberg@...bit.com, christoph.boehmwalder@...bit.com,
        minchan@...nel.org, ngupta@...are.org, senozhatsky@...omium.org,
        colyli@...e.de, kent.overstreet@...il.com, agk@...hat.com,
        snitzer@...nel.org, dm-devel@...hat.com, song@...nel.org,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, junxiao.bi@...cle.com,
        gulam.mohamed@...cle.com, martin.petersen@...cle.com,
        kch@...dia.com, drbd-dev@...ts.linbit.com,
        linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
        linux-raid@...r.kernel.org, nvdimm@...ts.linux.dev,
        konrad.wilk@...cle.com, joe.jin@...cle.com,
        rajesh.sivaramasubramaniom@...cle.com
Subject: Re: [PATCH for-6.2/block V3 2/2] block: Change the granularity of io
 ticks from ms to ns

Hi Gulam,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on axboe-block/for-next]
[also build test ERROR on song-md/md-next linus/master next-20221220]
[cannot apply to device-mapper-dm/for-next v6.1]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Gulam-Mohamed/block-Data-type-conversion-for-IO-accounting/20221221-121052
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link:    https://lore.kernel.org/r/20221221040506.1174644-2-gulam.mohamed%40oracle.com
patch subject: [PATCH for-6.2/block V3 2/2] block: Change the granularity of io ticks from ms to ns
config: i386-randconfig-a014-20221219
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/afff703cb450ec3806aa1a27406d21fc4eaa1f43
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gulam-Mohamed/block-Data-type-conversion-for-IO-accounting/20221221-121052
        git checkout afff703cb450ec3806aa1a27406d21fc4eaa1f43
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> drivers/md/dm.c:507:6: error: redefinition of 'start_time'
           u64 start_time = (blk_queue_precise_io_stat(q) ?
               ^
   drivers/md/dm.c:501:6: note: previous definition is here
           u64 start_time = io->start_time;
               ^
   1 error generated.


vim +/start_time +507 drivers/md/dm.c

   497	
   498	static void dm_io_acct(struct dm_io *io, bool end)
   499	{
   500		struct dm_stats_aux *stats_aux = &io->stats_aux;
   501		u64 start_time = io->start_time;
   502		struct mapped_device *md = io->md;
   503		struct bio *bio = io->orig_bio;
   504		unsigned int sectors;
   505		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
   506	
 > 507		u64 start_time = (blk_queue_precise_io_stat(q) ?
   508					nsecs_to_jiffies(io->start_time) :
   509					io->start_time);
   510	
   511		/*
   512		 * If REQ_PREFLUSH set, don't account payload, it will be
   513		 * submitted (and accounted) after this flush completes.
   514		 */
   515		if (bio_is_flush_with_data(bio))
   516			sectors = 0;
   517		else if (likely(!(dm_io_flagged(io, DM_IO_WAS_SPLIT))))
   518			sectors = bio_sectors(bio);
   519		else
   520			sectors = io->sectors;
   521	
   522		if (!end)
   523			bdev_start_io_acct(bio->bi_bdev, sectors, bio_op(bio),
   524					   start_time);
   525		else
   526			bdev_end_io_acct(bio->bi_bdev, bio_op(bio), start_time);
   527	
   528		if (static_branch_unlikely(&stats_enabled) &&
   529		    unlikely(dm_stats_used(&md->stats))) {
   530			sector_t sector;
   531	
   532			if (likely(!dm_io_flagged(io, DM_IO_WAS_SPLIT)))
   533				sector = bio->bi_iter.bi_sector;
   534			else
   535				sector = bio_end_sector(bio) - io->sector_offset;
   536	
   537			dm_stats_account_io(&md->stats, bio_data_dir(bio),
   538					    sector, sectors,
   539					    end, start_time, stats_aux);
   540		}
   541	}
   542	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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