::::::
:::::: Manual check reason: "low confidence bisect report"
:::::: Manual check reason: "low confidence static check warning:
drivers/regulator/mt6397-regulator.c:179:13: warning: shift by negative count
('-1') [-Wanalyzer-shift-count-negative]"
::::::
CC: kbuild-...@lists.01.org
BCC: l...@intel.com
CC: linux-ker...@vger.kernel.org
TO: Axel Lin <axel....@ingics.com>
CC: Mark Brown <broo...@kernel.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master
head: de5c208d533a46a074eb46ea17f672cc005a7269
commit: 12401a1cef787167aff52ef2dd28286e61054c38 regulator: mt6397: Remove
modeset_shift from struct mt6397_regulator_info
date: 12 months ago
:::::: branch date: 5 hours ago
:::::: commit date: 12 months ago
config: arm-randconfig-c002-20220622
(https://download.01.org/0day-ci/archive/20220623/202206230801.8s3tqxeh-...@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=12401a1cef787167aff52ef2dd28286e61054c38
git remote add linus
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 12401a1cef787167aff52ef2dd28286e61054c38
# save the config file
ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error'
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <l...@intel.com>
gcc-analyzer warnings: (new ones prefixed by >>)
In function 'mt6397_regulator_set_mode':
>> drivers/regulator/mt6397-regulator.c:179:13: warning: shift by negative
>> count ('-1') [-Wanalyzer-shift-count-negative]
179 | val <<= ffs(info->modeset_mask) - 1;
| ^~~
'mt6397_regulator_set_mode': events 1-2
|
| 158 | static int mt6397_regulator_set_mode(struct regulator_dev *rdev,
| | ^~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (1) entry to 'mt6397_regulator_set_mode'
|......
| 179 | val <<= ffs(info->modeset_mask) - 1;
| | ~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (2) calling 'ffs' from
'mt6397_regulator_set_mode'
|
+--> 'ffs': events 3-4
|
|include/asm-generic/bitops/ffs.h:13:19:
| 13 | static inline int ffs(int x)
| | ^~~
| | |
| | (3) entry to 'ffs'
|......
| 17 | if (!x)
| | ~
| | |
| | (4) following 'true' branch (when 'x == 0')...
|
'ffs': event 5
|
|cc1:
| (5): ...to here
|
<------+
|
'mt6397_regulator_set_mode': events 6-7
|
|drivers/regulator/mt6397-regulator.c:179:17:
| 179 | val <<= ffs(info->modeset_mask) - 1;
| | ~~~ ^~~~~~~~~~~~~~~~~~~~~~~
| | | |
| | | (6) returning to 'mt6397_regulator_set_mode'
from 'ffs'
| | (7) shift by negative amount here ('-1')
|
In function 'mt6397_regulator_get_mode':
drivers/regulator/mt6397-regulator.c:206:16: warning: shift by negative
count ('-1') [-Wanalyzer-shift-count-negative]
206 | regval >>= ffs(info->modeset_mask) - 1;
| ^~~
'mt6397_regulator_get_mode': events 1-4
|
| 193 | static unsigned int mt6397_regulator_get_mode(struct
regulator_dev *rdev)
| | ^~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (1) entry to 'mt6397_regulator_get_mode'
|......
| 199 | if (ret != 0) {
| | ~
| | |
| | (2) following 'false' branch (when 'ret == 0')...
|......
| 205 | regval &= info->modeset_mask;
| | ~~~~~~~~~~~~~~~~~~
| | |
| | (3) ...to here
| 206 | regval >>= ffs(info->modeset_mask) - 1;
| | ~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (4) calling 'ffs' from
'mt6397_regulator_get_mode'
|
+--> 'ffs': events 5-6
|
|include/asm-generic/bitops/ffs.h:13:19:
| 13 | static inline int ffs(int x)
| | ^~~
| | |
| | (5) entry to 'ffs'
|......
| 17 | if (!x)
| | ~
| | |
| | (6) following 'true' branch (when 'x == 0')...
|
'ffs': event 7
|
|cc1:
| (7): ...to here
|
<------+
|
'mt6397_regulator_get_mode': events 8-9
|
|drivers/regulator/mt6397-regulator.c:206:20:
| 206 | regval >>= ffs(info->modeset_mask) - 1;
| | ~~~ ^~~~~~~~~~~~~~~~~~~~~~~
| | | |
| | | (8) returning to 'mt6397_regulator_get_mode'
from 'ffs'
| | (9) shift by negative amount here ('-1')
|
vim +179 drivers/regulator/mt6397-regulator.c
8096236db4349c4 Anand K Mistry 2020-07-02 157
056925132722312 Henry Chen 2016-05-23 158 static int
mt6397_regulator_set_mode(struct regulator_dev *rdev,
056925132722312 Henry Chen 2016-05-23 159
unsigned int mode)
056925132722312 Henry Chen 2016-05-23 160 {
056925132722312 Henry Chen 2016-05-23 161 struct
mt6397_regulator_info *info = rdev_get_drvdata(rdev);
056925132722312 Henry Chen 2016-05-23 162 int ret, val;
056925132722312 Henry Chen 2016-05-23 163
056925132722312 Henry Chen 2016-05-23 164 switch (mode) {
056925132722312 Henry Chen 2016-05-23 165 case
REGULATOR_MODE_FAST:
056925132722312 Henry Chen 2016-05-23 166 val =
MT6397_BUCK_MODE_FORCE_PWM;
056925132722312 Henry Chen 2016-05-23 167 break;
056925132722312 Henry Chen 2016-05-23 168 case
REGULATOR_MODE_NORMAL:
056925132722312 Henry Chen 2016-05-23 169 val =
MT6397_BUCK_MODE_AUTO;
056925132722312 Henry Chen 2016-05-23 170 break;
056925132722312 Henry Chen 2016-05-23 171 default:
056925132722312 Henry Chen 2016-05-23 172 ret = -EINVAL;
056925132722312 Henry Chen 2016-05-23 173 goto err_mode;
056925132722312 Henry Chen 2016-05-23 174 }
056925132722312 Henry Chen 2016-05-23 175
12401a1cef78716 Axel Lin 2021-06-29 176 dev_dbg(&rdev->dev,
"mt6397 buck set_mode %#x, %#x, %#x\n",
12401a1cef78716 Axel Lin 2021-06-29 177
info->modeset_reg, info->modeset_mask, val);
12401a1cef78716 Axel Lin 2021-06-29 178
12401a1cef78716 Axel Lin 2021-06-29 @179 val <<=
ffs(info->modeset_mask) - 1;
056925132722312 Henry Chen 2016-05-23 180
056925132722312 Henry Chen 2016-05-23 181 ret =
regmap_update_bits(rdev->regmap, info->modeset_reg,
056925132722312 Henry Chen 2016-05-23 182
info->modeset_mask, val);
056925132722312 Henry Chen 2016-05-23 183 err_mode:
056925132722312 Henry Chen 2016-05-23 184 if (ret != 0) {
056925132722312 Henry Chen 2016-05-23 185
dev_err(&rdev->dev,
056925132722312 Henry Chen 2016-05-23 186 "Failed
to set mt6397 buck mode: %d\n", ret);
056925132722312 Henry Chen 2016-05-23 187 return ret;
056925132722312 Henry Chen 2016-05-23 188 }
056925132722312 Henry Chen 2016-05-23 189
056925132722312 Henry Chen 2016-05-23 190 return 0;
056925132722312 Henry Chen 2016-05-23 191 }
056925132722312 Henry Chen 2016-05-23 192
--
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