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Date:   Wed, 25 Oct 2023 07:45:04 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     oe-kbuild@...ts.linux.dev, Nitesh Shetty <nj.shetty@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...ts.linux.dev,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        nitheshshetty@...il.com, anuj1072538@...il.com,
        gost.dev@...sung.com, mcgrof@...nel.org,
        Nitesh Shetty <nj.shetty@...sung.com>,
        Hannes Reinecke <hare@...e.de>,
        Anuj Gupta <anuj20.g@...sung.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v17 03/12] block: add copy offload support

Hi Nitesh,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-and-sysfs-for-copy-offload-support/20231019-200658
base:   213f891525c222e8ed145ce1ce7ae1f47921cb9c
patch link:    https://lore.kernel.org/r/20231019110147.31672-4-nj.shetty%40samsung.com
patch subject: [PATCH v17 03/12] block: add copy offload support
config: i386-randconfig-141-20231022 (https://download.01.org/0day-ci/archive/20231025/202310251059.GiTmwLYx-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231025/202310251059.GiTmwLYx-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202310251059.GiTmwLYx-lkp@intel.com/

New smatch warnings:
block/blk-lib.c:248 blkdev_copy_offload() warn: use 'gfp' here instead of GFP_KERNEL?

Old smatch warnings:
block/blk-lib.c:264 blkdev_copy_offload() warn: use 'gfp' here instead of GFP_KERNEL?

vim +/gfp +248 block/blk-lib.c

391929a15e2c18 Nitesh Shetty 2023-10-19  228  ssize_t blkdev_copy_offload(struct block_device *bdev, loff_t pos_in,
391929a15e2c18 Nitesh Shetty 2023-10-19  229  			    loff_t pos_out, size_t len,
391929a15e2c18 Nitesh Shetty 2023-10-19  230  			    void (*endio)(void *, int, ssize_t),
391929a15e2c18 Nitesh Shetty 2023-10-19  231  			    void *private, gfp_t gfp)
391929a15e2c18 Nitesh Shetty 2023-10-19  232  {
391929a15e2c18 Nitesh Shetty 2023-10-19  233  	struct blkdev_copy_io *cio;
391929a15e2c18 Nitesh Shetty 2023-10-19  234  	struct blkdev_copy_offload_io *offload_io;
391929a15e2c18 Nitesh Shetty 2023-10-19  235  	struct bio *src_bio, *dst_bio;
391929a15e2c18 Nitesh Shetty 2023-10-19  236  	size_t rem, chunk;
391929a15e2c18 Nitesh Shetty 2023-10-19  237  	size_t max_copy_bytes = bdev_max_copy_sectors(bdev) << SECTOR_SHIFT;
391929a15e2c18 Nitesh Shetty 2023-10-19  238  	ssize_t ret;
391929a15e2c18 Nitesh Shetty 2023-10-19  239  	struct blk_plug plug;
391929a15e2c18 Nitesh Shetty 2023-10-19  240  
391929a15e2c18 Nitesh Shetty 2023-10-19  241  	if (!max_copy_bytes)
391929a15e2c18 Nitesh Shetty 2023-10-19  242  		return -EOPNOTSUPP;
391929a15e2c18 Nitesh Shetty 2023-10-19  243  
391929a15e2c18 Nitesh Shetty 2023-10-19  244  	ret = blkdev_copy_sanity_check(bdev, pos_in, bdev, pos_out, len);
391929a15e2c18 Nitesh Shetty 2023-10-19  245  	if (ret)
391929a15e2c18 Nitesh Shetty 2023-10-19  246  		return ret;
391929a15e2c18 Nitesh Shetty 2023-10-19  247  
391929a15e2c18 Nitesh Shetty 2023-10-19 @248  	cio = kzalloc(sizeof(*cio), GFP_KERNEL);

Should this be: cio = kzalloc(sizeof(*cio), gfp);?  It's not totally
clear from the context honestly.  (I haven't looked at the code outside
what is in this automated email).

391929a15e2c18 Nitesh Shetty 2023-10-19  249  	if (!cio)
391929a15e2c18 Nitesh Shetty 2023-10-19  250  		return -ENOMEM;
391929a15e2c18 Nitesh Shetty 2023-10-19  251  	atomic_set(&cio->refcount, 1);
391929a15e2c18 Nitesh Shetty 2023-10-19  252  	cio->waiter = current;
391929a15e2c18 Nitesh Shetty 2023-10-19  253  	cio->endio = endio;
391929a15e2c18 Nitesh Shetty 2023-10-19  254  	cio->private = private;
391929a15e2c18 Nitesh Shetty 2023-10-19  255  
391929a15e2c18 Nitesh Shetty 2023-10-19  256  	/*
391929a15e2c18 Nitesh Shetty 2023-10-19  257  	 * If there is a error, copied will be set to least successfully
391929a15e2c18 Nitesh Shetty 2023-10-19  258  	 * completed copied length
391929a15e2c18 Nitesh Shetty 2023-10-19  259  	 */
391929a15e2c18 Nitesh Shetty 2023-10-19  260  	cio->copied = len;
391929a15e2c18 Nitesh Shetty 2023-10-19  261  	for (rem = len; rem > 0; rem -= chunk) {
391929a15e2c18 Nitesh Shetty 2023-10-19  262  		chunk = min(rem, max_copy_bytes);
391929a15e2c18 Nitesh Shetty 2023-10-19  263  
391929a15e2c18 Nitesh Shetty 2023-10-19  264  		offload_io = kzalloc(sizeof(*offload_io), GFP_KERNEL);
391929a15e2c18 Nitesh Shetty 2023-10-19  265  		if (!offload_io)
391929a15e2c18 Nitesh Shetty 2023-10-19  266  			goto err_free_cio;
391929a15e2c18 Nitesh Shetty 2023-10-19  267  		offload_io->cio = cio;
391929a15e2c18 Nitesh Shetty 2023-10-19  268  		/*
391929a15e2c18 Nitesh Shetty 2023-10-19  269  		 * For partial completion, we use offload_io->offset to truncate
391929a15e2c18 Nitesh Shetty 2023-10-19  270  		 * successful copy length
391929a15e2c18 Nitesh Shetty 2023-10-19  271  		 */
391929a15e2c18 Nitesh Shetty 2023-10-19  272  		offload_io->offset = len - rem;
391929a15e2c18 Nitesh Shetty 2023-10-19  273  
391929a15e2c18 Nitesh Shetty 2023-10-19  274  		src_bio = bio_alloc(bdev, 0, REQ_OP_COPY_SRC, gfp);
391929a15e2c18 Nitesh Shetty 2023-10-19  275  		if (!src_bio)
391929a15e2c18 Nitesh Shetty 2023-10-19  276  			goto err_free_offload_io;
391929a15e2c18 Nitesh Shetty 2023-10-19  277  		src_bio->bi_iter.bi_size = chunk;
391929a15e2c18 Nitesh Shetty 2023-10-19  278  		src_bio->bi_iter.bi_sector = pos_in >> SECTOR_SHIFT;
391929a15e2c18 Nitesh Shetty 2023-10-19  279  
391929a15e2c18 Nitesh Shetty 2023-10-19  280  		blk_start_plug(&plug);
391929a15e2c18 Nitesh Shetty 2023-10-19  281  		dst_bio = blk_next_bio(src_bio, bdev, 0, REQ_OP_COPY_DST, gfp);
391929a15e2c18 Nitesh Shetty 2023-10-19  282  		if (!dst_bio)
391929a15e2c18 Nitesh Shetty 2023-10-19  283  			goto err_free_src_bio;
391929a15e2c18 Nitesh Shetty 2023-10-19  284  		dst_bio->bi_iter.bi_size = chunk;
391929a15e2c18 Nitesh Shetty 2023-10-19  285  		dst_bio->bi_iter.bi_sector = pos_out >> SECTOR_SHIFT;
391929a15e2c18 Nitesh Shetty 2023-10-19  286  		dst_bio->bi_end_io = blkdev_copy_offload_dst_endio;
391929a15e2c18 Nitesh Shetty 2023-10-19  287  		dst_bio->bi_private = offload_io;
391929a15e2c18 Nitesh Shetty 2023-10-19  288  
391929a15e2c18 Nitesh Shetty 2023-10-19  289  		atomic_inc(&cio->refcount);
391929a15e2c18 Nitesh Shetty 2023-10-19  290  		submit_bio(dst_bio);
391929a15e2c18 Nitesh Shetty 2023-10-19  291  		blk_finish_plug(&plug);
391929a15e2c18 Nitesh Shetty 2023-10-19  292  		pos_in += chunk;
391929a15e2c18 Nitesh Shetty 2023-10-19  293  		pos_out += chunk;
391929a15e2c18 Nitesh Shetty 2023-10-19  294  	}
391929a15e2c18 Nitesh Shetty 2023-10-19  295  
391929a15e2c18 Nitesh Shetty 2023-10-19  296  	if (atomic_dec_and_test(&cio->refcount))
391929a15e2c18 Nitesh Shetty 2023-10-19  297  		blkdev_copy_endio(cio);
391929a15e2c18 Nitesh Shetty 2023-10-19  298  	if (endio)
391929a15e2c18 Nitesh Shetty 2023-10-19  299  		return -EIOCBQUEUED;
391929a15e2c18 Nitesh Shetty 2023-10-19  300  
391929a15e2c18 Nitesh Shetty 2023-10-19  301  	return blkdev_copy_wait_for_completion_io(cio);
391929a15e2c18 Nitesh Shetty 2023-10-19  302  
391929a15e2c18 Nitesh Shetty 2023-10-19  303  err_free_src_bio:
391929a15e2c18 Nitesh Shetty 2023-10-19  304  	bio_put(src_bio);
391929a15e2c18 Nitesh Shetty 2023-10-19  305  err_free_offload_io:
391929a15e2c18 Nitesh Shetty 2023-10-19  306  	kfree(offload_io);
391929a15e2c18 Nitesh Shetty 2023-10-19  307  err_free_cio:
391929a15e2c18 Nitesh Shetty 2023-10-19  308  	cio->copied = min_t(ssize_t, cio->copied, (len - rem));
391929a15e2c18 Nitesh Shetty 2023-10-19  309  	cio->status = -ENOMEM;
391929a15e2c18 Nitesh Shetty 2023-10-19  310  	if (rem == len) {
391929a15e2c18 Nitesh Shetty 2023-10-19  311  		ret = cio->status;
391929a15e2c18 Nitesh Shetty 2023-10-19  312  		kfree(cio);
391929a15e2c18 Nitesh Shetty 2023-10-19  313  		return ret;
391929a15e2c18 Nitesh Shetty 2023-10-19  314  	}
391929a15e2c18 Nitesh Shetty 2023-10-19  315  	if (cio->endio)
391929a15e2c18 Nitesh Shetty 2023-10-19  316  		return cio->status;
391929a15e2c18 Nitesh Shetty 2023-10-19  317  
391929a15e2c18 Nitesh Shetty 2023-10-19  318  	return blkdev_copy_wait_for_completion_io(cio);
391929a15e2c18 Nitesh Shetty 2023-10-19  319  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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