* drivers/acpi/pfr_telemetry.c:176:3: warning: Value stored to 'ext_status' is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-04-07 12:51 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-04-07 12:51 UTC (permalink / raw)
To: kbuild
[-- Attachment #1: Type: text/plain, Size: 15940 bytes --]
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: linux-kernel(a)vger.kernel.org
TO: Chen Yu <yu.c.chen@intel.com>
CC: "Rafael J. Wysocki" <rjw@rjwysocki.net>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 3e732ebf7316ac83e8562db7e64cc68aec390a18
commit: b0013e037a8b07772c74ce24f1ae4743b30fc3cf ACPI: Introduce Platform Firmware Runtime Telemetry driver
date: 3 months ago
:::::: branch date: 2 days ago
:::::: commit date: 3 months ago
config: x86_64-randconfig-c007-20220404 (https://download.01.org/0day-ci/archive/20220407/202204072043.hq2zqj94-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566)
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=b0013e037a8b07772c74ce24f1ae4743b30fc3cf
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b0013e037a8b07772c74ce24f1ae4743b30fc3cf
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
include/linux/jump_label.h:420:2: note: expanded from macro 'static_key_enabled'
static_key_count((struct static_key *)x) > 0; \
^
include/linux/compiler.h:80:39: note: expanded from macro 'unlikely_notrace'
# define unlikely_notrace(x) unlikely(x)
~~~~~~~~~^~
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
drivers/iommu/dma-iommu.c:988:2: note: Taking false branch
if (static_branch_unlikely(&iommu_deferred_attach_enabled)) {
^
drivers/iommu/dma-iommu.c:994:6: note: Calling 'dev_use_swiotlb'
if (dev_use_swiotlb(dev))
^~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:315:9: note: Left side of '&&' is true
return IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev);
^
include/linux/kconfig.h:73:28: note: expanded from macro 'IS_ENABLED'
#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))
^
include/linux/kconfig.h:24:22: note: expanded from macro '__or'
#define __or(x, y) ___or(x, y)
^
include/linux/kconfig.h:25:23: note: expanded from macro '___or'
#define ___or(x, y) ____or(__ARG_PLACEHOLDER_##x, y)
^
include/linux/kconfig.h:26:65: note: expanded from macro '____or'
#define ____or(arg1_or_junk, y) __take_second_arg(arg1_or_junk 1, y)
^
drivers/iommu/dma-iommu.c:315:2: note: Returning zero, which participates in a condition later
return IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:994:6: note: Returning from 'dev_use_swiotlb'
if (dev_use_swiotlb(dev))
^~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:994:2: note: Taking false branch
if (dev_use_swiotlb(dev))
^
drivers/iommu/dma-iommu.c:997:6: note: Assuming the condition is false
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:997:2: note: Taking false branch
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
^
drivers/iommu/dma-iommu.c:1006:28: note: Assuming 'i' is < 'nents'
for_each_sg(sg, s, nents, i) {
^
include/linux/scatterlist.h:152:31: note: expanded from macro 'for_each_sg'
for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
^~~~~~~~~~
drivers/iommu/dma-iommu.c:1006:2: note: Loop condition is true. Entering loop body
for_each_sg(sg, s, nents, i) {
^
include/linux/scatterlist.h:152:2: note: expanded from macro 'for_each_sg'
for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
^
drivers/iommu/dma-iommu.c:1030:7: note: Assuming 'pad_len' is not equal to 0
if (pad_len && pad_len < s_length - 1) {
^~~~~~~
drivers/iommu/dma-iommu.c:1030:7: note: Left side of '&&' is true
drivers/iommu/dma-iommu.c:1030:18: note: Assuming the condition is true
if (pad_len && pad_len < s_length - 1) {
^~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:1030:3: note: Taking true branch
if (pad_len && pad_len < s_length - 1) {
^
drivers/iommu/dma-iommu.c:1031:17: note: Access to field 'length' results in a dereference of a null pointer (loaded from variable 'prev')
prev->length += pad_len;
~~~~ ^
drivers/iommu/dma-iommu.c:1149:7: warning: Value stored to 'coherent' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
bool coherent = dev_is_dma_coherent(dev);
^~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/dma-iommu.c:1149:7: note: Value stored to 'coherent' during its initialization is never read
bool coherent = dev_is_dma_coherent(dev);
^~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 5 warnings (5 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.
4 warnings generated.
Suppressed 4 warnings (4 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.
5 warnings generated.
Suppressed 5 warnings (5 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.
5 warnings generated.
Suppressed 5 warnings (5 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.
6 warnings generated.
drivers/acpi/acpi_dbg.c:634:4: warning: Value stored to 'count' is never read [clang-analyzer-deadcode.DeadStores]
count -= ret;
^ ~~~
drivers/acpi/acpi_dbg.c:634:4: note: Value stored to 'count' is never read
count -= ret;
^ ~~~
Suppressed 5 warnings (5 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
7 warnings generated.
>> drivers/acpi/pfr_telemetry.c:176:3: warning: Value stored to 'ext_status' is never read [clang-analyzer-deadcode.DeadStores]
ext_status = obj->integer.value;
^ ~~~~~~~~~~~~~~~~~~
drivers/acpi/pfr_telemetry.c:176:3: note: Value stored to 'ext_status' is never read
ext_status = obj->integer.value;
^ ~~~~~~~~~~~~~~~~~~
drivers/acpi/pfr_telemetry.c:207:3: warning: Value stored to 'ext_status' is never read [clang-analyzer-deadcode.DeadStores]
ext_status = obj->integer.value;
^ ~~~~~~~~~~~~~~~~~~
drivers/acpi/pfr_telemetry.c:207:3: note: Value stored to 'ext_status' is never read
ext_status = obj->integer.value;
^ ~~~~~~~~~~~~~~~~~~
Suppressed 5 warnings (5 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.
8 warnings generated.
drivers/acpi/apei/apei-base.c:377:2: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
list_for_each_entry_safe(res, resn, res_list, list) {
^
include/linux/list.h:717:13: note: expanded from macro 'list_for_each_entry_safe'
for (pos = list_first_entry(head, typeof(*pos), member), \
^
include/linux/list.h:524:2: note: expanded from macro 'list_first_entry'
list_entry((ptr)->next, type, member)
^
include/linux/list.h:513:2: note: expanded from macro 'list_entry'
container_of(ptr, type, member)
^
include/linux/container_of.h:18:2: note: expanded from macro 'container_of'
void *__mptr = (void *)(ptr); \
^
drivers/acpi/apei/apei-base.c:473:6: note: Assuming 'rc' is 0
if (rc)
^~
drivers/acpi/apei/apei-base.c:473:2: note: Taking false branch
if (rc)
^
drivers/acpi/apei/apei-base.c:483:6: note: Assuming 'rc' is 0
if (rc)
^~
drivers/acpi/apei/apei-base.c:483:2: note: Taking false branch
if (rc)
^
drivers/acpi/apei/apei-base.c:486:6: note: Assuming 'rc' is 0
if (rc)
^~
drivers/acpi/apei/apei-base.c:486:2: note: Taking false branch
if (rc)
^
drivers/acpi/apei/apei-base.c:489:6: note: Assuming 'arch_apei_filter_addr' is null
if (arch_apei_filter_addr) {
^~~~~~~~~~~~~~~~~~~~~
drivers/acpi/apei/apei-base.c:489:2: note: Taking false branch
if (arch_apei_filter_addr) {
^
drivers/acpi/apei/apei-base.c:500:2: note: Loop condition is false. Execution continues on line 513
list_for_each_entry(res, &resources->iomem, list) {
^
include/linux/list.h:630:2: note: expanded from macro 'list_for_each_entry'
for (pos = list_first_entry(head, typeof(*pos), member); \
^
drivers/acpi/apei/apei-base.c:513:2: note: Loop condition is false. Execution continues on line 525
list_for_each_entry(res, &resources->ioport, list) {
^
include/linux/list.h:630:2: note: expanded from macro 'list_for_each_entry'
for (pos = list_first_entry(head, typeof(*pos), member); \
^
drivers/acpi/apei/apei-base.c:526:6: note: 'rc' is not equal to 0
if (rc) {
^~
drivers/acpi/apei/apei-base.c:526:2: note: Taking true branch
if (rc) {
^
drivers/acpi/apei/apei-base.c:527:3: note: Loop condition is false. Exiting loop
pr_err(APEI_PFX "Fail to merge resources!\n");
^
include/linux/printk.h:493:2: note: expanded from macro 'pr_err'
printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
^
include/linux/printk.h:450:26: note: expanded from macro 'printk'
#define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
^
include/linux/printk.h:421:3: note: expanded from macro 'printk_index_wrap'
__printk_index_emit(_fmt, NULL, NULL); \
^
include/linux/printk.h:396:34: note: expanded from macro '__printk_index_emit'
#define __printk_index_emit(...) do {} while (0)
^
drivers/acpi/apei/apei-base.c:528:3: note: Control jumps to line 534
goto err_unmap_ioport;
^
drivers/acpi/apei/apei-base.c:534:2: note: Loop condition is false. Execution continues on line 539
list_for_each_entry(res, &resources->ioport, list) {
^
include/linux/list.h:630:2: note: expanded from macro 'list_for_each_entry'
for (pos = list_first_entry(head, typeof(*pos), member); \
^
drivers/acpi/apei/apei-base.c:541:2: note: Loop condition is false. Execution continues on line 547
list_for_each_entry(res, &resources->iomem, list) {
^
include/linux/list.h:630:2: note: expanded from macro 'list_for_each_entry'
for (pos = list_first_entry(head, typeof(*pos), member); \
vim +/ext_status +176 drivers/acpi/pfr_telemetry.c
b0013e037a8b077 Chen Yu 2021-12-22 150
b0013e037a8b077 Chen Yu 2021-12-22 151 static int set_pfrt_log_level(int level, struct pfrt_log_device *pfrt_log_dev)
b0013e037a8b077 Chen Yu 2021-12-22 152 {
b0013e037a8b077 Chen Yu 2021-12-22 153 acpi_handle handle = ACPI_HANDLE(pfrt_log_dev->parent_dev);
b0013e037a8b077 Chen Yu 2021-12-22 154 union acpi_object *out_obj, *obj, in_obj, in_buf;
b0013e037a8b077 Chen Yu 2021-12-22 155 enum pfru_dsm_status status, ext_status;
b0013e037a8b077 Chen Yu 2021-12-22 156 int ret = 0;
b0013e037a8b077 Chen Yu 2021-12-22 157
b0013e037a8b077 Chen Yu 2021-12-22 158 memset(&in_obj, 0, sizeof(in_obj));
b0013e037a8b077 Chen Yu 2021-12-22 159 memset(&in_buf, 0, sizeof(in_buf));
b0013e037a8b077 Chen Yu 2021-12-22 160 in_obj.type = ACPI_TYPE_PACKAGE;
b0013e037a8b077 Chen Yu 2021-12-22 161 in_obj.package.count = 1;
b0013e037a8b077 Chen Yu 2021-12-22 162 in_obj.package.elements = &in_buf;
b0013e037a8b077 Chen Yu 2021-12-22 163 in_buf.type = ACPI_TYPE_INTEGER;
b0013e037a8b077 Chen Yu 2021-12-22 164 in_buf.integer.value = level;
b0013e037a8b077 Chen Yu 2021-12-22 165
b0013e037a8b077 Chen Yu 2021-12-22 166 out_obj = acpi_evaluate_dsm_typed(handle, &pfrt_log_guid,
b0013e037a8b077 Chen Yu 2021-12-22 167 pfrt_log_dev->info.log_revid, PFRT_FUNC_SET_LEV,
b0013e037a8b077 Chen Yu 2021-12-22 168 &in_obj, ACPI_TYPE_PACKAGE);
b0013e037a8b077 Chen Yu 2021-12-22 169 if (!out_obj)
b0013e037a8b077 Chen Yu 2021-12-22 170 return -EINVAL;
b0013e037a8b077 Chen Yu 2021-12-22 171
b0013e037a8b077 Chen Yu 2021-12-22 172 obj = &out_obj->package.elements[0];
b0013e037a8b077 Chen Yu 2021-12-22 173 status = obj->integer.value;
b0013e037a8b077 Chen Yu 2021-12-22 174 if (status != DSM_SUCCEED) {
b0013e037a8b077 Chen Yu 2021-12-22 175 obj = &out_obj->package.elements[1];
b0013e037a8b077 Chen Yu 2021-12-22 @176 ext_status = obj->integer.value;
b0013e037a8b077 Chen Yu 2021-12-22 177 dev_dbg(pfrt_log_dev->parent_dev, "Error Status:%d\n", status);
b0013e037a8b077 Chen Yu 2021-12-22 178 dev_dbg(pfrt_log_dev->parent_dev, "Error Extend Status:%d\n", ext_status);
b0013e037a8b077 Chen Yu 2021-12-22 179 ret = -EBUSY;
b0013e037a8b077 Chen Yu 2021-12-22 180 }
b0013e037a8b077 Chen Yu 2021-12-22 181
b0013e037a8b077 Chen Yu 2021-12-22 182 kfree(out_obj);
b0013e037a8b077 Chen Yu 2021-12-22 183
b0013e037a8b077 Chen Yu 2021-12-22 184 return ret;
b0013e037a8b077 Chen Yu 2021-12-22 185 }
b0013e037a8b077 Chen Yu 2021-12-22 186
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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2022-04-07 12:51 drivers/acpi/pfr_telemetry.c:176:3: warning: Value stored to 'ext_status' is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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