On line 1759, since ret is unsigned it will not be less than 0. julia ---------- Forwarded message ---------- Date: Tue, 14 Feb 2017 09:00:39 +0800 From: kbuild test robot <fengguang.wu@xxxxxxxxx> To: kbuild@xxxxxx Cc: Julia Lawall <julia.lawall@xxxxxxx> Subject: Re: [PATCH v4 1/1] DM: inplace compressed DM target CC: kbuild-all@xxxxxx In-Reply-To: <1487018545-5061-2-git-send-email-linuxram@xxxxxxxxxx> Hi Ram, [auto build test WARNING on dm/for-next] [also build test WARNING on v4.10-rc8 next-20170213] [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/Ram-Pai/DM-inplace-compressed-DM-target/20170214-055727 base: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next :::::: branch date: 3 hours ago :::::: commit date: 3 hours ago >> drivers/md/dm-inplace-compress.c:1759:5-8: WARNING: Unsigned expression compared with zero: ret < 0 git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout e7924efaaba5efdcd28f32efbb949ed1153c932c vim +1759 drivers/md/dm-inplace-compress.c e7924efa Ram Pai 2017-02-13 1743 * @io : io range e7924efa Ram Pai 2017-02-13 1744 * @sector_start : the sector on backing storage to which the e7924efa Ram Pai 2017-02-13 1745 * compressed data needs to be written. e7924efa Ram Pai 2017-02-13 1746 * @meta_start: the page index of the bits corresponding to e7924efa Ram Pai 2017-02-13 1747 * @meta_end : start and end blocks. e7924efa Ram Pai 2017-02-13 1748 */ e7924efa Ram Pai 2017-02-13 1749 static int dm_icomp_compress_write(struct dm_icomp_io_range *io, e7924efa Ram Pai 2017-02-13 1750 sector_t sector_start, u64 *meta_start, u64 *meta_end) e7924efa Ram Pai 2017-02-13 1751 { e7924efa Ram Pai 2017-02-13 1752 struct dm_icomp_req *req = io->req; e7924efa Ram Pai 2017-02-13 1753 sector_t count = DMCP_BYTES_TO_SECTOR(io->decomp_len); e7924efa Ram Pai 2017-02-13 1754 unsigned int comp_len, ret; e7924efa Ram Pai 2017-02-13 1755 u64 page_index; e7924efa Ram Pai 2017-02-13 1756 e7924efa Ram Pai 2017-02-13 1757 /* comp_data must be able to accommadate a larger compress buffer */ e7924efa Ram Pai 2017-02-13 1758 ret = dm_icomp_io_range_compress(req->info, io, &comp_len); e7924efa Ram Pai 2017-02-13 @1759 if (ret < 0) { e7924efa Ram Pai 2017-02-13 1760 req->result = -EIO; e7924efa Ram Pai 2017-02-13 1761 return -EIO; e7924efa Ram Pai 2017-02-13 1762 } e7924efa Ram Pai 2017-02-13 1763 WARN_ON(comp_len > io->comp_len); e7924efa Ram Pai 2017-02-13 1764 e7924efa Ram Pai 2017-02-13 1765 dm_icomp_get_req(req); e7924efa Ram Pai 2017-02-13 1766 e7924efa Ram Pai 2017-02-13 1767 io->io_req.bi_op = REQ_OP_WRITE; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
