Re: [PATCH 08/12] maple_tree: Separate ma_state node from status.
From: kernel test robot
Date: Thu Nov 02 2023 - 04:43:43 EST
Hi Liam,
kernel test robot noticed the following build warnings:
[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.6 next-20231102]
[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/Liam-R-Howlett/maple_tree-Remove-unnecessary-default-labels-from-switch-statements/20231102-033618
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20231101171629.3612299-9-Liam.Howlett%40oracle.com
patch subject: [PATCH 08/12] maple_tree: Separate ma_state node from status.
config: arc-randconfig-001-20231102 (https://download.01.org/0day-ci/archive/20231102/202311021622.6KoUHJP7-lkp@xxxxxxxxx/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231102/202311021622.6KoUHJP7-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311021622.6KoUHJP7-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
drivers/base/regmap/regcache-maple.c: In function 'regcache_maple_drop':
drivers/base/regmap/regcache-maple.c:113:23: warning: 'lower_index' is used uninitialized [-Wuninitialized]
113 | unsigned long lower_index, lower_last;
| ^~~~~~~~~~~
drivers/base/regmap/regcache-maple.c:113:36: warning: 'lower_last' is used uninitialized [-Wuninitialized]
113 | unsigned long lower_index, lower_last;
| ^~~~~~~~~~
>> drivers/base/regmap/regcache-maple.c:114:23: warning: 'upper_index' is used uninitialized [-Wuninitialized]
114 | unsigned long upper_index, upper_last;
| ^~~~~~~~~~~
>> drivers/base/regmap/regcache-maple.c:114:36: warning: 'upper_last' is used uninitialized [-Wuninitialized]
114 | unsigned long upper_index, upper_last;
| ^~~~~~~~~~
vim +/upper_index +114 drivers/base/regmap/regcache-maple.c
f033c26de5a5734 Mark Brown 2023-03-30 106
f033c26de5a5734 Mark Brown 2023-03-30 107 static int regcache_maple_drop(struct regmap *map, unsigned int min,
f033c26de5a5734 Mark Brown 2023-03-30 108 unsigned int max)
f033c26de5a5734 Mark Brown 2023-03-30 109 {
f033c26de5a5734 Mark Brown 2023-03-30 110 struct maple_tree *mt = map->cache;
f033c26de5a5734 Mark Brown 2023-03-30 111 MA_STATE(mas, mt, min, max);
f033c26de5a5734 Mark Brown 2023-03-30 112 unsigned long *entry, *lower, *upper;
f033c26de5a5734 Mark Brown 2023-03-30 113 unsigned long lower_index, lower_last;
f033c26de5a5734 Mark Brown 2023-03-30 @114 unsigned long upper_index, upper_last;
f033c26de5a5734 Mark Brown 2023-03-30 115 int ret;
f033c26de5a5734 Mark Brown 2023-03-30 116
f033c26de5a5734 Mark Brown 2023-03-30 117 lower = NULL;
f033c26de5a5734 Mark Brown 2023-03-30 118 upper = NULL;
f033c26de5a5734 Mark Brown 2023-03-30 119
f033c26de5a5734 Mark Brown 2023-03-30 120 mas_lock(&mas);
f033c26de5a5734 Mark Brown 2023-03-30 121
f033c26de5a5734 Mark Brown 2023-03-30 122 mas_for_each(&mas, entry, max) {
f033c26de5a5734 Mark Brown 2023-03-30 123 /*
f033c26de5a5734 Mark Brown 2023-03-30 124 * This is safe because the regmap lock means the
f033c26de5a5734 Mark Brown 2023-03-30 125 * Maple lock is redundant, but we need to take it due
f033c26de5a5734 Mark Brown 2023-03-30 126 * to lockdep asserts in the maple tree code.
f033c26de5a5734 Mark Brown 2023-03-30 127 */
f033c26de5a5734 Mark Brown 2023-03-30 128 mas_unlock(&mas);
f033c26de5a5734 Mark Brown 2023-03-30 129
f033c26de5a5734 Mark Brown 2023-03-30 130 /* Do we need to save any of this entry? */
f033c26de5a5734 Mark Brown 2023-03-30 131 if (mas.index < min) {
f033c26de5a5734 Mark Brown 2023-03-30 132 lower_index = mas.index;
f033c26de5a5734 Mark Brown 2023-03-30 133 lower_last = min -1;
f033c26de5a5734 Mark Brown 2023-03-30 134
f033c26de5a5734 Mark Brown 2023-03-30 135 lower = kmemdup(entry, ((min - mas.index) *
f033c26de5a5734 Mark Brown 2023-03-30 136 sizeof(unsigned long)),
b0393e1fe40e962 Guenter Roeck 2023-07-20 137 map->alloc_flags);
f033c26de5a5734 Mark Brown 2023-03-30 138 if (!lower) {
f033c26de5a5734 Mark Brown 2023-03-30 139 ret = -ENOMEM;
451941ac1ee2be1 Mark Brown 2023-04-03 140 goto out_unlocked;
f033c26de5a5734 Mark Brown 2023-03-30 141 }
f033c26de5a5734 Mark Brown 2023-03-30 142 }
f033c26de5a5734 Mark Brown 2023-03-30 143
f033c26de5a5734 Mark Brown 2023-03-30 144 if (mas.last > max) {
f033c26de5a5734 Mark Brown 2023-03-30 145 upper_index = max + 1;
f033c26de5a5734 Mark Brown 2023-03-30 146 upper_last = mas.last;
f033c26de5a5734 Mark Brown 2023-03-30 147
f033c26de5a5734 Mark Brown 2023-03-30 148 upper = kmemdup(&entry[max + 1],
f033c26de5a5734 Mark Brown 2023-03-30 149 ((mas.last - max) *
f033c26de5a5734 Mark Brown 2023-03-30 150 sizeof(unsigned long)),
b0393e1fe40e962 Guenter Roeck 2023-07-20 151 map->alloc_flags);
f033c26de5a5734 Mark Brown 2023-03-30 152 if (!upper) {
f033c26de5a5734 Mark Brown 2023-03-30 153 ret = -ENOMEM;
451941ac1ee2be1 Mark Brown 2023-04-03 154 goto out_unlocked;
f033c26de5a5734 Mark Brown 2023-03-30 155 }
f033c26de5a5734 Mark Brown 2023-03-30 156 }
f033c26de5a5734 Mark Brown 2023-03-30 157
f033c26de5a5734 Mark Brown 2023-03-30 158 kfree(entry);
f033c26de5a5734 Mark Brown 2023-03-30 159 mas_lock(&mas);
f033c26de5a5734 Mark Brown 2023-03-30 160 mas_erase(&mas);
f033c26de5a5734 Mark Brown 2023-03-30 161
f033c26de5a5734 Mark Brown 2023-03-30 162 /* Insert new nodes with the saved data */
f033c26de5a5734 Mark Brown 2023-03-30 163 if (lower) {
f033c26de5a5734 Mark Brown 2023-03-30 164 mas_set_range(&mas, lower_index, lower_last);
b0393e1fe40e962 Guenter Roeck 2023-07-20 165 ret = mas_store_gfp(&mas, lower, map->alloc_flags);
f033c26de5a5734 Mark Brown 2023-03-30 166 if (ret != 0)
f033c26de5a5734 Mark Brown 2023-03-30 167 goto out;
f033c26de5a5734 Mark Brown 2023-03-30 168 lower = NULL;
f033c26de5a5734 Mark Brown 2023-03-30 169 }
f033c26de5a5734 Mark Brown 2023-03-30 170
f033c26de5a5734 Mark Brown 2023-03-30 171 if (upper) {
f033c26de5a5734 Mark Brown 2023-03-30 172 mas_set_range(&mas, upper_index, upper_last);
b0393e1fe40e962 Guenter Roeck 2023-07-20 173 ret = mas_store_gfp(&mas, upper, map->alloc_flags);
f033c26de5a5734 Mark Brown 2023-03-30 174 if (ret != 0)
f033c26de5a5734 Mark Brown 2023-03-30 175 goto out;
f033c26de5a5734 Mark Brown 2023-03-30 176 upper = NULL;
f033c26de5a5734 Mark Brown 2023-03-30 177 }
f033c26de5a5734 Mark Brown 2023-03-30 178 }
f033c26de5a5734 Mark Brown 2023-03-30 179
f033c26de5a5734 Mark Brown 2023-03-30 180 out:
f033c26de5a5734 Mark Brown 2023-03-30 181 mas_unlock(&mas);
451941ac1ee2be1 Mark Brown 2023-04-03 182 out_unlocked:
f033c26de5a5734 Mark Brown 2023-03-30 183 kfree(lower);
f033c26de5a5734 Mark Brown 2023-03-30 184 kfree(upper);
f033c26de5a5734 Mark Brown 2023-03-30 185
f033c26de5a5734 Mark Brown 2023-03-30 186 return ret;
f033c26de5a5734 Mark Brown 2023-03-30 187 }
f033c26de5a5734 Mark Brown 2023-03-30 188
--
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