* drivers/opp/core.c:876:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn]
@ 2022-09-04 12:04 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-09-04 12:04 UTC (permalink / raw)
To: kbuild
[-- Attachment #1: Type: text/plain, Size: 14524 bytes --]
::::::
:::::: Manual check reason: "low confidence static check warning: drivers/opp/core.c:876:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn]"
::::::
BCC: lkp(a)intel.com
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Viresh Kumar <viresh.kumar@linaro.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 7726d4c3e60bfe206738894267414a5f10510f1a
commit: 8174a3a613af1a911ab19da812824f7180b261f9 OPP: Provide a simple implementation to configure multiple clocks
date: 8 weeks ago
:::::: branch date: 8 hours ago
:::::: commit date: 8 weeks ago
config: s390-randconfig-c005-20220901 (https://download.01.org/0day-ci/archive/20220904/202209041954.WBCg5eXI-lkp(a)intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project c55b41d5199d2394dd6cdb8f52180d8b81d809d4)
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
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8174a3a613af1a911ab19da812824f7180b261f9
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 8174a3a613af1a911ab19da812824f7180b261f9
# save the config file
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 clang-analyzer
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
clang_analyzer warnings: (new ones prefixed by >>)
^
drivers/s390/char/sclp_tty.c:502:6: note: Dereference of null pointer
if (MACHINE_IS_VM && !CONSOLE_IS_SCLP)
^
arch/s390/include/asm/setup.h:80:25: note: expanded from macro 'MACHINE_IS_VM'
#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/s390/include/asm/lowcore.h:213:22: note: expanded from macro 'S390_lowcore'
#define S390_lowcore (*((struct lowcore *) 0))
^
Suppressed 19 warnings (7 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
7 warnings generated.
Suppressed 7 warnings (7 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
19 warnings generated.
Suppressed 19 warnings (7 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
8 warnings generated.
drivers/mtd/nand/raw/nand_bbt.c:579:3: warning: Value stored to 'bbtblocks' is never read [clang-analyzer-deadcode.DeadStores]
bbtblocks = mtd->size >> this->bbt_erase_shift;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mtd/nand/raw/nand_bbt.c:579:3: note: Value stored to 'bbtblocks' is never read
bbtblocks = mtd->size >> this->bbt_erase_shift;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 7 warnings (7 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
28 warnings generated.
Suppressed 28 warnings (16 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
20 warnings generated.
Suppressed 20 warnings (8 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
8 warnings generated.
drivers/s390/net/smsgiucv.c:141:7: warning: Dereference of null pointer [clang-analyzer-core.NullDereference]
if (!MACHINE_IS_VM) {
^
arch/s390/include/asm/setup.h:80:25: note: expanded from macro 'MACHINE_IS_VM'
#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/s390/include/asm/lowcore.h:213:22: note: expanded from macro 'S390_lowcore'
#define S390_lowcore (*((struct lowcore *) 0))
^
drivers/s390/net/smsgiucv.c:141:7: note: Dereference of null pointer
if (!MACHINE_IS_VM) {
^
arch/s390/include/asm/setup.h:80:25: note: expanded from macro 'MACHINE_IS_VM'
#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/s390/include/asm/lowcore.h:213:22: note: expanded from macro 'S390_lowcore'
#define S390_lowcore (*((struct lowcore *) 0))
^
Suppressed 7 warnings (7 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
28 warnings generated.
Suppressed 28 warnings (16 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
28 warnings generated.
Suppressed 28 warnings (16 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
28 warnings generated.
Suppressed 28 warnings (16 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
24 warnings generated.
Suppressed 24 warnings (12 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
8 warnings generated.
>> drivers/opp/core.c:876:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn]
return ret;
^ ~~~
drivers/opp/core.c:854:6: note: 'ret' declared without an initial value
int ret, i;
^~~
drivers/opp/core.c:856:6: note: Assuming 'scaling_down' is false
if (scaling_down) {
^~~~~~~~~~~~
drivers/opp/core.c:856:2: note: Taking false branch
if (scaling_down) {
^
drivers/opp/core.c:866:15: note: Assuming 'i' is >= field 'clk_count'
for (i = 0; i < opp_table->clk_count; i++) {
^~~~~~~~~~~~~~~~~~~~~~~~
drivers/opp/core.c:866:3: note: Loop condition is false. Execution continues on line 876
for (i = 0; i < opp_table->clk_count; i++) {
^
drivers/opp/core.c:876:2: note: Undefined or garbage value returned to caller
return ret;
^ ~~~
Suppressed 7 warnings (7 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
27 warnings generated.
Suppressed 27 warnings (15 in non-user code, 12 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
vim +876 drivers/opp/core.c
947355850fcb3b drivers/base/power/opp/core.c Viresh Kumar 2016-12-01 845
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 846 /*
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 847 * Simple implementation for configuring multiple clocks. Configure clocks in
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 848 * the order in which they are present in the array while scaling up.
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 849 */
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 850 int dev_pm_opp_config_clks_simple(struct device *dev,
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 851 struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 852 bool scaling_down)
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 853 {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 854 int ret, i;
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 855
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 856 if (scaling_down) {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 857 for (i = opp_table->clk_count - 1; i >= 0; i--) {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 858 ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 859 if (ret) {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 860 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 861 ret);
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 862 return ret;
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 863 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 864 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 865 } else {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 866 for (i = 0; i < opp_table->clk_count; i++) {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 867 ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 868 if (ret) {
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 869 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 870 ret);
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 871 return ret;
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 872 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 873 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 874 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 875
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 @876 return ret;
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 877 }
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 878 EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);
8174a3a613af1a drivers/opp/core.c Viresh Kumar 2022-06-10 879
--
0-DAY CI Kernel Test Service
https://01.org/lkp
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-09-04 12:04 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-09-04 12:04 drivers/opp/core.c:876:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn] kernel test robot
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.