* [ti:ti-rt-linux-5.10.y 3870/10213] drivers/pci/endpoint/pci-epf-core.c:84:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
@ 2021-12-16 0:39 kernel test robot
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From: kernel test robot @ 2021-12-16 0:39 UTC (permalink / raw)
To: kbuild
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CC: kbuild-all(a)lists.01.org
CC: vigneshr(a)ti.com
CC: nm(a)ti.com
TO: Kishon Vijay Abraham I <kishon@ti.com>
CC: Vignesh Raghavendra <vigneshr@ti.com>
tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.10.y
head: 541ec9a6995c3dd881d6f0b63cc714a08ded457d
commit: 5fe4c2dfaa4e6413f98aedd00c8b2b372e5b0103 [3870/10213] PCI: endpoint: Add support to associate secondary EPC with EPF
:::::: branch date: 12 days ago
:::::: commit date: 9 months ago
config: x86_64-randconfig-c007-20211209 (https://download.01.org/0day-ci/archive/20211216/202112160806.KGtGhr3C-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a)
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
git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
git fetch --no-tags ti ti-rt-linux-5.10.y
git checkout 5fe4c2dfaa4e6413f98aedd00c8b2b372e5b0103
# 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 >>)
^~
crypto/ecc.c:1401:2: note: Taking false branch
if (!pk) {
^
crypto/ecc.c:1406:2: note: Calling 'ecc_point_mult'
ecc_point_mult(pk, &curve->g, priv, NULL, curve, ndigits);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:1168:25: note: Assuming 'i' is <= 0
for (i = num_bits - 2; i > 0; i--) {
^~~~~
crypto/ecc.c:1168:2: note: Loop condition is false. Execution continues on line 1176
for (i = num_bits - 2; i > 0; i--) {
^
crypto/ecc.c:1176:7: note: Assuming the condition is true
nb = !vli_test_bit(scalar, 0);
^~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:1189:2: note: Calling 'vli_mod_inv'
vli_mod_inv(z, z, curve_prime, point->ndigits);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:866:6: note: Assuming the condition is false
if (vli_is_zero(input, ndigits)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:866:2: note: Taking false branch
if (vli_is_zero(input, ndigits)) {
^
crypto/ecc.c:871:2: note: Calling 'vli_set'
vli_set(a, input, ndigits);
^~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:199:14: note: Assuming 'i' is >= 'ndigits'
for (i = 0; i < ndigits; i++)
^~~~~~~~~~~
crypto/ecc.c:199:2: note: Loop condition is false. Execution continues on line 199
for (i = 0; i < ndigits; i++)
^
crypto/ecc.c:201:1: note: Returning without writing to '*dest'
}
^
crypto/ecc.c:871:2: note: Returning from 'vli_set'
vli_set(a, input, ndigits);
^~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:877:9: note: Assuming the condition is true
while ((cmp_result = vli_cmp(a, b, ndigits)) != 0) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:877:2: note: Loop condition is true. Entering loop body
while ((cmp_result = vli_cmp(a, b, ndigits)) != 0) {
^
crypto/ecc.c:880:7: note: The left operand of '&' is a garbage value
if (EVEN@) {
^
crypto/ecc.c:853:29: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
~~~~~~ ^
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.
Suppressed 8 warnings (8 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.
9 warnings generated.
fs/xfs/libxfs/xfs_refcount.c:111:19: warning: Value stored to 'agno' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
xfs_agnumber_t agno = cur->bc_ag.agno;
^~~~ ~~~~~~~~~~~~~~~
fs/xfs/libxfs/xfs_refcount.c:111:19: note: Value stored to 'agno' during its initialization is never read
xfs_agnumber_t agno = cur->bc_ag.agno;
^~~~ ~~~~~~~~~~~~~~~
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
Suppressed 8 warnings (8 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.
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.
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.
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/pci/endpoint/pci-epf-core.c:84:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct device *dev = epf->epc->dev.parent;
^~~ ~~~~~~~~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epf-core.c:84:17: note: Value stored to 'dev' during its initialization is never read
struct device *dev = epf->epc->dev.parent;
^~~ ~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
7 warnings generated.
drivers/pci/controller/dwc/pcie-designware-host.c:105:18: warning: Value stored to 'pci' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
^~~
drivers/pci/controller/dwc/pcie-designware-host.c:105:18: note: Value stored to 'pci' during its initialization is never read
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
^~~
drivers/pci/controller/dwc/pcie-designware-host.c:597:27: warning: Access to field 'res' results in a dereference of a null pointer (loaded from variable 'entry') [clang-analyzer-core.NullDereference]
PCIE_ATU_TYPE_MEM, entry->res->start,
^~~~~
drivers/pci/controller/dwc/pcie-designware-host.c:535:24: note: Left side of '&&' is false
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
^
drivers/pci/controller/dwc/pcie-designware.h:279:34: note: expanded from macro 'to_dw_pcie_from_pp'
#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
^
include/linux/kernel.h:853:61: note: expanded from macro 'container_of'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
drivers/pci/controller/dwc/pcie-designware-host.c:535:24: note: Taking false branch
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
^
drivers/pci/controller/dwc/pcie-designware.h:279:34: note: expanded from macro 'to_dw_pcie_from_pp'
#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
^
include/linux/kernel.h:853:2: note: expanded from macro 'container_of'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^
include/linux/compiler_types.h:315:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:303:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:295:3: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^
drivers/pci/controller/dwc/pcie-designware-host.c:535:24: note: Loop condition is false. Exiting loop
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
^
drivers/pci/controller/dwc/pcie-designware.h:279:34: note: expanded from macro 'to_dw_pcie_from_pp'
#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
^
include/linux/kernel.h:853:2: note: expanded from macro 'container_of'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^
include/linux/compiler_types.h:315:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:303:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:293:2: note: expanded from macro '__compiletime_assert'
do { \
^
drivers/pci/controller/dwc/pcie-designware-host.c:545:6: note: Assuming the condition is false
if (pci_msi_enabled() && !pp->ops->msi_host_init) {
^~~~~~~~~~~~~~~~~
drivers/pci/controller/dwc/pcie-designware-host.c:545:24: note: Left side of '&&' is false
if (pci_msi_enabled() && !pp->ops->msi_host_init) {
^
drivers/pci/controller/dwc/pcie-designware-host.c:588:6: note: Assuming the condition is true
if (pp->bridge->child_ops == &dw_child_pcie_ops) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/controller/dwc/pcie-designware-host.c:588:2: note: Taking true branch
if (pp->bridge->child_ops == &dw_child_pcie_ops) {
^
drivers/pci/controller/dwc/pcie-designware-host.c:589:32: note: 'entry' initialized to a null pointer value
struct resource_entry *tmp, *entry = NULL;
^~~~~
drivers/pci/controller/dwc/pcie-designware-host.c:592:3: note: Left side of '&&' is false
resource_list_for_each_entry(tmp, &pp->bridge->windows)
^
include/linux/resource_ext.h:64:2: note: expanded from macro 'resource_list_for_each_entry'
list_for_each_entry((entry), (list), node)
^
include/linux/list.h:628:13: note: expanded from macro 'list_for_each_entry'
for (pos = list_first_entry(head, typeof(*pos), member); \
^
include/linux/list.h:522:2: note: expanded from macro 'list_first_entry'
list_entry((ptr)->next, type, member)
vim +/dev +84 drivers/pci/endpoint/pci-epf-core.c
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 71
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 72 /**
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 73 * pci_epf_free_space() - free the allocated PCI EPF register space
9b41d19aff4090 Krzysztof Kozlowski 2020-07-29 74 * @epf: the EPF device from whom to free the memory
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 75 * @addr: the virtual address of the PCI EPF register space
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 76 * @bar: the BAR number corresponding to the register space
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 77 * @type: Identifies if the allocated space is for primary EPC or secondary EPC
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 78 *
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 79 * Invoke to free the allocated PCI EPF register space.
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 80 */
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 81 void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 82 enum pci_epc_interface_type type)
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 83 {
b330104fa76df3 Kishon Vijay Abraham I 2018-01-11 @84 struct device *dev = epf->epc->dev.parent;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 85 struct pci_epf_bar *epf_bar;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 86 struct pci_epc *epc;
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 87
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 88 if (!addr)
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 89 return;
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 90
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 91 if (type == PRIMARY_INTERFACE) {
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 92 epc = epf->epc;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 93 epf_bar = epf->bar;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 94 } else {
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 95 epc = epf->sec_epc;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 96 epf_bar = epf->sec_epc_bar;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 97 }
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 98
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 99 dev = epc->dev.parent;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 100 dma_free_coherent(dev, epf_bar[bar].size, addr,
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 101 epf_bar[bar].phys_addr);
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 102
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 103 epf_bar[bar].phys_addr = 0;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 104 epf_bar[bar].addr = NULL;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 105 epf_bar[bar].size = 0;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 106 epf_bar[bar].barno = 0;
5fe4c2dfaa4e64 Kishon Vijay Abraham I 2021-03-19 107 epf_bar[bar].flags = 0;
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 108 }
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 109 EXPORT_SYMBOL_GPL(pci_epf_free_space);
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 110
:::::: The code at line 84 was first introduced by commit
:::::: b330104fa76df3eae6e199a23791fed5d35f06b4 PCI: endpoint: Use EPC's device in dma_alloc_coherent()/dma_free_coherent()
:::::: TO: Kishon Vijay Abraham I <kishon@ti.com>
:::::: CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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2021-12-16 0:39 [ti:ti-rt-linux-5.10.y 3870/10213] drivers/pci/endpoint/pci-epf-core.c:84:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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