* drivers/vfio/vfio_main.c:957 vfio_combine_iova_ranges() error: uninitialized symbol 'last'.
@ 2023-09-03 2:17 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-09-03 2:17 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Brett Creeley <brett.creeley@amd.com>
CC: Alex Williamson <alex.williamson@redhat.com>
CC: Shannon Nelson <shannon.nelson@amd.com>
CC: Simon Horman <horms@kernel.org>
CC: Jason Gunthorpe <jgg@nvidia.com>
CC: Kevin Tian <kevin.tian@intel.com>
CC: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 92901222f83d988617aee37680cb29e1a743b5e4
commit: 9a4087fab303e7923ab839a6fe35059659a54649 vfio: Commonize combine_ranges for use in other VFIO drivers
date: 2 weeks ago
:::::: branch date: 4 hours ago
:::::: commit date: 2 weeks ago
config: x86_64-randconfig-161-20230902 (https://download.01.org/0day-ci/archive/20230903/202309031015.RIpZul4a-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230903/202309031015.RIpZul4a-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@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202309031015.RIpZul4a-lkp@intel.com/
smatch warnings:
drivers/vfio/vfio_main.c:957 vfio_combine_iova_ranges() error: uninitialized symbol 'last'.
drivers/vfio/vfio_main.c:978 vfio_combine_iova_ranges() error: potentially dereferencing uninitialized 'comb_end'.
drivers/vfio/vfio_main.c:978 vfio_combine_iova_ranges() error: potentially dereferencing uninitialized 'comb_start'.
vim +/last +957 drivers/vfio/vfio_main.c
115dcec65f61d5 drivers/vfio/vfio.c Jason Gunthorpe 2022-02-24 937
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 938 void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 939 u32 req_nodes)
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 940 {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 941 struct interval_tree_node *prev, *curr, *comb_start, *comb_end;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 942 unsigned long min_gap, curr_gap;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 943
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 944 /* Special shortcut when a single range is required */
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 945 if (req_nodes == 1) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 946 unsigned long last;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 947
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 948 comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 949 curr = comb_start;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 950 while (curr) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 951 last = curr->last;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 952 prev = curr;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 953 curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 954 if (prev != comb_start)
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 955 interval_tree_remove(prev, root);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 956 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 @957 comb_start->last = last;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 958 return;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 959 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 960
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 961 /* Combine ranges which have the smallest gap */
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 962 while (cur_nodes > req_nodes) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 963 prev = NULL;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 964 min_gap = ULONG_MAX;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 965 curr = interval_tree_iter_first(root, 0, ULONG_MAX);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 966 while (curr) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 967 if (prev) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 968 curr_gap = curr->start - prev->last;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 969 if (curr_gap < min_gap) {
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 970 min_gap = curr_gap;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 971 comb_start = prev;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 972 comb_end = curr;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 973 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 974 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 975 prev = curr;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 976 curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 977 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 @978 comb_start->last = comb_end->last;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 979 interval_tree_remove(comb_end, root);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 980 cur_nodes--;
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 981 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 982 }
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 983 EXPORT_SYMBOL_GPL(vfio_combine_iova_ranges);
9a4087fab303e7 drivers/vfio/vfio_main.c Brett Creeley 2023-08-07 984
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2023-09-03 2:17 drivers/vfio/vfio_main.c:957 vfio_combine_iova_ranges() error: uninitialized symbol 'last' kernel test robot
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