* [linux-next:master 1767/8646] drivers/memory/tegra/tegra30-emc.c:1164:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-02-25 21:07 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-02-25 21:07 UTC (permalink / raw)
To: kbuild
[-- Attachment #1: Type: text/plain, Size: 19947 bytes --]
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Dmitry Osipenko <digetx@gmail.com>
CC: Krzysztof Kozlowski <krzk@kernel.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 44948bd49d878dad6c9707e34f4a06df73c3a800
commit: e3aabb3c7dbe66201b45d7b2c20132196f491ad4 [1767/8646] memory: tegra30-emc: Print additional memory info
:::::: branch date: 19 hours ago
:::::: commit date: 4 weeks ago
config: arm-randconfig-c002-20220223 (https://download.01.org/0day-ci/archive/20220226/202202260552.TPnzbKMS-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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 arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e3aabb3c7dbe66201b45d7b2c20132196f491ad4
git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git fetch --no-tags linux-next master
git checkout e3aabb3c7dbe66201b45d7b2c20132196f491ad4
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>)
drivers/media/tuners/tuner-xc2028.c:1037:3: note: Value stored to 'rc' is never read
Suppressed 2 warnings (2 with check filters).
2 warnings generated.
Suppressed 2 warnings (2 with check filters).
2 warnings generated.
drivers/media/v4l2-core/videobuf-core.c:712:10: warning: Access to field 'state' results in a dereference of a null pointer (loaded from variable 'buf') [clang-analyzer-core.NullDereference]
switch (buf->state) {
^~~
drivers/media/v4l2-core/videobuf-core.c:698:2: note: 'buf' initialized to a null pointer value
struct videobuf_buffer *buf = NULL;
^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/media/v4l2-core/videobuf-core.c:701:2: note: Assuming field 'magic' is equal to 304484355
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
^
drivers/media/v4l2-core/videobuf-core.c:27:16: note: expanded from macro 'MAGIC_CHECK'
if (unlikely((is) != (should))) { \
~~~~~~~~~^~~~~~~~~~~~~~~~~
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
drivers/media/v4l2-core/videobuf-core.c:701:2: note: Taking false branch
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
^
drivers/media/v4l2-core/videobuf-core.c:27:3: note: expanded from macro 'MAGIC_CHECK'
if (unlikely((is) != (should))) { \
^
drivers/media/v4l2-core/videobuf-core.c:701:2: note: Loop condition is false. Exiting loop
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
^
drivers/media/v4l2-core/videobuf-core.c:26:2: note: expanded from macro 'MAGIC_CHECK'
do { \
^
drivers/media/v4l2-core/videobuf-core.c:706:11: note: Calling 'stream_next_buffer'
retval = stream_next_buffer(q, &buf, nonblocking);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/media/v4l2-core/videobuf-core.c:682:6: note: Assuming 'retval' is not equal to 0
if (retval)
^~~~~~
drivers/media/v4l2-core/videobuf-core.c:682:2: note: Taking true branch
if (retval)
^
drivers/media/v4l2-core/videobuf-core.c:683:3: note: Control jumps to line 692
goto done;
^
drivers/media/v4l2-core/videobuf-core.c:692:2: note: Returning without writing to '*vb'
return retval;
^
drivers/media/v4l2-core/videobuf-core.c:706:11: note: Returning from 'stream_next_buffer'
retval = stream_next_buffer(q, &buf, nonblocking);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/media/v4l2-core/videobuf-core.c:707:6: note: Assuming 'retval' is >= 0
if (retval < 0) {
^~~~~~~~~~
drivers/media/v4l2-core/videobuf-core.c:707:2: note: Taking false branch
if (retval < 0) {
^
drivers/media/v4l2-core/videobuf-core.c:712:10: note: Access to field 'state' results in a dereference of a null pointer (loaded from variable 'buf')
switch (buf->state) {
^~~
Suppressed 1 warnings (1 with check filters).
1 warning generated.
drivers/input/keyboard/lm8323.c:333:3: warning: Value stored to 'active' is never read [clang-analyzer-deadcode.DeadStores]
active = debounce + 3;
^ ~~~~~~~~~~~~
drivers/input/keyboard/lm8323.c:333:3: note: Value stored to 'active' is never read
active = debounce + 3;
^ ~~~~~~~~~~~~
1 warning generated.
lib/xarray.c:2029:18: warning: Value stored to 'node' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct xa_node *node = xas->xa_node;
^~~~ ~~~~~~~~~~~~
lib/xarray.c:2029:18: note: Value stored to 'node' during its initialization is never read
struct xa_node *node = xas->xa_node;
^~~~ ~~~~~~~~~~~~
4 warnings generated.
drivers/memory/tegra/tegra20-emc.c:645:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "INVALID";
^ ~~~~~~~~~
drivers/memory/tegra/tegra20-emc.c:645:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "INVALID";
^ ~~~~~~~~~
drivers/memory/tegra/tegra20-emc.c:648:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "DDR1";
^ ~~~~~~
drivers/memory/tegra/tegra20-emc.c:648:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "DDR1";
^ ~~~~~~
drivers/memory/tegra/tegra20-emc.c:651:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "LPDDR2";
^ ~~~~~~~~
drivers/memory/tegra/tegra20-emc.c:651:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "LPDDR2";
^ ~~~~~~~~
drivers/memory/tegra/tegra20-emc.c:654:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "DDR2";
^ ~~~~~~
drivers/memory/tegra/tegra20-emc.c:654:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "DDR2";
^ ~~~~~~
4 warnings generated.
>> drivers/memory/tegra/tegra30-emc.c:1164:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "DDR1";
^ ~~~~~~
drivers/memory/tegra/tegra30-emc.c:1164:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "DDR1";
^ ~~~~~~
drivers/memory/tegra/tegra30-emc.c:1167:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "LPDDR2";
^ ~~~~~~~~
drivers/memory/tegra/tegra30-emc.c:1167:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "LPDDR2";
^ ~~~~~~~~
drivers/memory/tegra/tegra30-emc.c:1170:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "DDR2";
^ ~~~~~~
drivers/memory/tegra/tegra30-emc.c:1170:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "DDR2";
^ ~~~~~~
drivers/memory/tegra/tegra30-emc.c:1173:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores]
dram_type_str = "DDR3";
^ ~~~~~~
drivers/memory/tegra/tegra30-emc.c:1173:3: note: Value stored to 'dram_type_str' is never read
dram_type_str = "DDR3";
^ ~~~~~~
1 warning generated.
Suppressed 1 warnings (1 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.
1 warning generated.
Suppressed 1 warnings (1 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.
1 warning generated.
drivers/staging/ks7010/ks_wlan_net.c:2104:2: warning: Value stored to 'p' is never read [clang-analyzer-deadcode.DeadStores]
p = memcpy(priv->wps.ie + 1, p, len);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/ks7010/ks_wlan_net.c:2104:2: note: Value stored to 'p' is never read
p = memcpy(priv->wps.ie + 1, p, len);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings generated.
drivers/media/tuners/fc0011.c:252:3: warning: Value stored to 'bandwidth' is never read [clang-analyzer-deadcode.DeadStores]
bandwidth = 6000;
^ ~~~~
drivers/media/tuners/fc0011.c:252:3: note: Value stored to 'bandwidth' is never read
bandwidth = 6000;
^ ~~~~
Suppressed 1 warnings (1 with check filters).
1 warning generated.
Suppressed 1 warnings (1 with check filters).
3 warnings generated.
drivers/media/tuners/it913x.c:151:26: warning: Value stored to 'pdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct platform_device *pdev = dev->pdev;
^~~~ ~~~~~~~~~
drivers/media/tuners/it913x.c:151:26: note: Value stored to 'pdev' during its initialization is never read
struct platform_device *pdev = dev->pdev;
^~~~ ~~~~~~~~~
drivers/media/tuners/it913x.c:210:26: warning: Value stored to 'pdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct platform_device *pdev = dev->pdev;
^~~~ ~~~~~~~~~
drivers/media/tuners/it913x.c:210:26: note: Value stored to 'pdev' during its initialization is never read
struct platform_device *pdev = dev->pdev;
^~~~ ~~~~~~~~~
Suppressed 1 warnings (1 with check filters).
2 warnings generated.
drivers/media/tuners/m88rs6000t.c:475:25: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct m88rs6000t_dev *dev = fe->tuner_priv;
^~~ ~~~~~~~~~~~~~~
drivers/media/tuners/m88rs6000t.c:475:25: note: Value stored to 'dev' during its initialization is never read
struct m88rs6000t_dev *dev = fe->tuner_priv;
^~~ ~~~~~~~~~~~~~~
Suppressed 1 warnings (1 with check filters).
1 warning generated.
Suppressed 1 warnings (1 with check filters).
1 warning generated.
Suppressed 1 warnings (1 with check filters).
2 warnings generated.
lib/radix-tree.c:1046:3: warning: 4th function call argument is an uninitialized value [clang-analyzer-core.CallAndMessage]
node_tag_clear(root, parent, tag, offset);
^ ~~~~~~
lib/radix-tree.c:1032:2: note: 'offset' declared without an initial value
int offset;
^~~~~~~~~~
lib/radix-tree.c:1035:6: note: Assuming 'index' is <= 'maxindex'
if (index > maxindex)
^~~~~~~~~~~~~~~~
lib/radix-tree.c:1035:2: note: Taking false branch
if (index > maxindex)
^
lib/radix-tree.c:1040:2: note: Loop condition is false. Execution continues on line 1045
while (radix_tree_is_internal_node(node)) {
^
lib/radix-tree.c:1045:6: note: Assuming 'node' is non-null
if (node)
^~~~
lib/radix-tree.c:1045:2: note: Taking true branch
if (node)
^
lib/radix-tree.c:1046:3: note: 4th function call argument is an uninitialized value
node_tag_clear(root, parent, tag, offset);
^ ~~~~~~
Suppressed 1 warnings (1 with check filters).
1 warning generated.
drivers/input/keyboard/atkbd.c:1078:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
vim +/dram_type_str +1164 drivers/memory/tegra/tegra30-emc.c
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1117
e34212c75a6899 Dmitry Osipenko 2019-08-12 1118 static int emc_setup_hw(struct tegra_emc *emc)
e34212c75a6899 Dmitry Osipenko 2019-08-12 1119 {
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1120 u32 fbio_cfg5, emc_cfg, emc_dbg, emc_adr_cfg;
930c68180ffb05 Dmitry Osipenko 2020-03-19 1121 u32 intmask = EMC_REFRESH_OVERFLOW_INT;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1122 static bool print_sdram_info_once;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1123 enum emc_dram_type dram_type;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1124 const char *dram_type_str;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1125 unsigned int emem_numdev;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1126
e34212c75a6899 Dmitry Osipenko 2019-08-12 1127 fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1128 dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1129
e34212c75a6899 Dmitry Osipenko 2019-08-12 1130 emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1131
e34212c75a6899 Dmitry Osipenko 2019-08-12 1132 /* enable EMC and CAR to handshake on PLL divider/source changes */
e34212c75a6899 Dmitry Osipenko 2019-08-12 1133 emc_cfg |= EMC_CLKCHANGE_REQ_ENABLE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1134
e34212c75a6899 Dmitry Osipenko 2019-08-12 1135 /* configure clock change mode accordingly to DRAM type */
e34212c75a6899 Dmitry Osipenko 2019-08-12 1136 switch (dram_type) {
e34212c75a6899 Dmitry Osipenko 2019-08-12 1137 case DRAM_TYPE_LPDDR2:
e34212c75a6899 Dmitry Osipenko 2019-08-12 1138 emc_cfg |= EMC_CLKCHANGE_PD_ENABLE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1139 emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1140 break;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1141
e34212c75a6899 Dmitry Osipenko 2019-08-12 1142 default:
e34212c75a6899 Dmitry Osipenko 2019-08-12 1143 emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1144 emc_cfg &= ~EMC_CLKCHANGE_PD_ENABLE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1145 break;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1146 }
e34212c75a6899 Dmitry Osipenko 2019-08-12 1147
e34212c75a6899 Dmitry Osipenko 2019-08-12 1148 writel_relaxed(emc_cfg, emc->regs + EMC_CFG_2);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1149
e34212c75a6899 Dmitry Osipenko 2019-08-12 1150 /* initialize interrupt */
e34212c75a6899 Dmitry Osipenko 2019-08-12 1151 writel_relaxed(intmask, emc->regs + EMC_INTMASK);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1152 writel_relaxed(0xffffffff, emc->regs + EMC_INTSTATUS);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1153
e34212c75a6899 Dmitry Osipenko 2019-08-12 1154 /* ensure that unwanted debug features are disabled */
e34212c75a6899 Dmitry Osipenko 2019-08-12 1155 emc_dbg = readl_relaxed(emc->regs + EMC_DBG);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1156 emc_dbg |= EMC_DBG_CFG_PRIORITY;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1157 emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1158 emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1159 emc_dbg &= ~EMC_DBG_FORCE_UPDATE;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1160 writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
e34212c75a6899 Dmitry Osipenko 2019-08-12 1161
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1162 switch (dram_type) {
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1163 case DRAM_TYPE_DDR1:
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 @1164 dram_type_str = "DDR1";
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1165 break;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1166 case DRAM_TYPE_LPDDR2:
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1167 dram_type_str = "LPDDR2";
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1168 break;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1169 case DRAM_TYPE_DDR2:
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1170 dram_type_str = "DDR2";
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1171 break;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1172 case DRAM_TYPE_DDR3:
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1173 dram_type_str = "DDR3";
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1174 break;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1175 }
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1176
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1177 emc_adr_cfg = readl_relaxed(emc->regs + EMC_ADR_CFG);
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1178 emem_numdev = FIELD_GET(EMC_ADR_CFG_EMEM_NUMDEV, emc_adr_cfg) + 1;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1179
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1180 dev_info_once(emc->dev, "%u %s %s attached\n", emem_numdev,
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1181 dram_type_str, emem_numdev == 2 ? "devices" : "device");
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1182
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1183 if (dram_type == DRAM_TYPE_LPDDR2 && !print_sdram_info_once) {
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1184 while (emem_numdev--)
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1185 emc_read_lpddr_sdram_info(emc, emem_numdev);
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1186
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1187 print_sdram_info_once = true;
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1188 }
e3aabb3c7dbe66 Dmitry Osipenko 2021-12-22 1189
e34212c75a6899 Dmitry Osipenko 2019-08-12 1190 return 0;
e34212c75a6899 Dmitry Osipenko 2019-08-12 1191 }
e34212c75a6899 Dmitry Osipenko 2019-08-12 1192
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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2022-02-25 21:07 [linux-next:master 1767/8646] drivers/memory/tegra/tegra30-emc.c:1164:3: warning: Value stored to 'dram_type_str' is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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