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Subjectdrivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (112 padding bytes, where 48 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explici
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e8a4e1c1bb697b1d9fc48f0e56dc0f50bc024bee
commit: ec679bda639fe84b78d473526ae27c74dea383fb spi: bcm2835: Allow arbitrary number of slaves
date: 1 year, 1 month ago
config: arm-randconfig-c002-20220702 (https://download.01.org/0day-ci/archive/20220708/202207082123.mUdLb6eW-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project f7a80c3d08d4821e621fc88d6a2e435291f82dff)
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/torvalds/linux.git/commit/?id=ec679bda639fe84b78d473526ae27c74dea383fb
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout ec679bda639fe84b78d473526ae27c74dea383fb
# save the config file
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>)
^
include/linux/i2c.h:344:26: note: expanded from macro 'to_i2c_client'
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
^
include/linux/kernel.h:704:2: 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:328:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:316:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:308:3: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^
drivers/iio/chemical/scd30_i2c.c:41:30: note: Loop condition is false. Exiting loop
struct i2c_client *client = to_i2c_client(state->dev);
^
include/linux/i2c.h:344:26: note: expanded from macro 'to_i2c_client'
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
^
include/linux/kernel.h:704:2: 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:328:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:316:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:306:2: note: expanded from macro '__compiletime_assert'
do { \
^
drivers/iio/chemical/scd30_i2c.c:49:6: note: Assuming 'ret' is >= 0
if (ret < 0)
^~~~~~~
drivers/iio/chemical/scd30_i2c.c:49:2: note: Taking false branch
if (ret < 0)
^
drivers/iio/chemical/scd30_i2c.c:51:6: note: Assuming 'ret' is equal to 'txsize'
if (ret != txsize)
^~~~~~~~~~~~~
drivers/iio/chemical/scd30_i2c.c:51:2: note: Taking false branch
if (ret != txsize)
^
drivers/iio/chemical/scd30_i2c.c:54:7: note: 'rxbuf' is non-null
if (!rxbuf)
^~~~~
drivers/iio/chemical/scd30_i2c.c:54:2: note: Taking false branch
if (!rxbuf)
^
drivers/iio/chemical/scd30_i2c.c:58:6: note: Assuming 'ret' is >= 0
if (ret < 0)
^~~~~~~
drivers/iio/chemical/scd30_i2c.c:58:2: note: Taking false branch
if (ret < 0)
^
drivers/iio/chemical/scd30_i2c.c:60:6: note: Assuming 'ret' is equal to 'rxsize'
if (ret != rxsize)
^~~~~~~~~~~~~
drivers/iio/chemical/scd30_i2c.c:60:2: note: Taking false branch
if (ret != rxsize)
^
drivers/iio/chemical/scd30_i2c.c:63:2: note: Returning zero, which participates in a condition later
return 0;
^~~~~~~~
drivers/iio/chemical/scd30_i2c.c:92:8: note: Returning from 'scd30_i2c_xfer'
ret = scd30_i2c_xfer(state, buf, i, buf, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iio/chemical/scd30_i2c.c:93:6: note: 'ret' is 0
if (ret)
^~~
drivers/iio/chemical/scd30_i2c.c:93:2: note: Taking false branch
if (ret)
^
drivers/iio/chemical/scd30_i2c.c:97:14: note: Assuming 'i' is < 'size'
for (i = 0; i < size; i += 3) {
^~~~~~~~
drivers/iio/chemical/scd30_i2c.c:97:2: note: Loop condition is true. Entering loop body
for (i = 0; i < size; i += 3) {
^
drivers/iio/chemical/scd30_i2c.c:99:7: note: Assuming the condition is false
if (crc != buf[i + 2]) {
^~~~~~~~~~~~~~~~~
drivers/iio/chemical/scd30_i2c.c:99:3: note: Taking false branch
if (crc != buf[i + 2]) {
^
drivers/iio/chemical/scd30_i2c.c:104:10: note: Dereference of null pointer
*rsp++ = buf[i];
~~~~~~~^~~~~~~~
Suppressed 16 warnings (16 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.
17 warnings generated.
>> drivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (112 padding bytes, where 48 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct bcm2835_spidev {
~~~~~~~^~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:153:8: note: Excessive padding in 'struct bcm2835_spidev' (112 padding bytes, where 48 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explicit padding members
struct bcm2835_spidev {
~~~~~~~^~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1164:20: warning: Access to field 'device' results in a dereference of a null pointer (loaded from field 'dma_rx') [clang-analyzer-core.NullDereference]
dma_unmap_single(ctlr->dma_rx->device->dev,
^
drivers/spi/spi-bcm2835.c:1213:27: note: Calling 'spi_controller_get_devdata'
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/spi/spi.h:675:2: note: Returning without writing to 'ctlr->dma_rx'
return dev_get_drvdata(&ctlr->dev);
^
drivers/spi/spi-bcm2835.c:1213:27: note: Returning from 'spi_controller_get_devdata'
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1219:6: note: Assuming 'slv' is non-null
if (!slv) {
^~~~
drivers/spi/spi-bcm2835.c:1219:2: note: Taking false branch
if (!slv) {
^
drivers/spi/spi-bcm2835.c:1239:6: note: Assuming the condition is false
if (spi->mode & SPI_CPOL)
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1239:2: note: Taking false branch
if (spi->mode & SPI_CPOL)
^
drivers/spi/spi-bcm2835.c:1241:6: note: Assuming the condition is false
if (spi->mode & SPI_CPHA)
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1241:2: note: Taking false branch
if (spi->mode & SPI_CPHA)
^
drivers/spi/spi-bcm2835.c:1249:6: note: Assuming field 'dma_rx' is null
if (ctlr->dma_rx) {
^~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1249:2: note: Taking false branch
if (ctlr->dma_rx) {
^
drivers/spi/spi-bcm2835.c:1262:6: note: Assuming the condition is false
if (spi->mode & SPI_NO_CS)
^~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1262:2: note: Taking false branch
if (spi->mode & SPI_NO_CS)
^
drivers/spi/spi-bcm2835.c:1268:6: note: Assuming field 'cs_gpiod' is null
if (spi->cs_gpiod)
^~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1268:2: note: Taking false branch
if (spi->cs_gpiod)
^
drivers/spi/spi-bcm2835.c:1270:6: note: Assuming field 'chip_select' is <= 1
if (spi->chip_select > 1) {
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1270:2: note: Taking false branch
if (spi->chip_select > 1) {
^
drivers/spi/spi-bcm2835.c:1292:6: note: Assuming 'chip' is non-null
if (!chip)
^~~~~
drivers/spi/spi-bcm2835.c:1292:2: note: Taking false branch
if (!chip)
^
drivers/spi/spi-bcm2835.c:1299:2: note: Taking true branch
if (IS_ERR(spi->cs_gpiod)) {
^
drivers/spi/spi-bcm2835.c:1301:3: note: Control jumps to line 1311
goto err_cleanup;
^
drivers/spi/spi-bcm2835.c:1311:2: note: Calling 'bcm2835_spi_cleanup'
bcm2835_spi_cleanup(spi);
^~~~~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1160:6: note: Assuming field 'clear_rx_desc' is null
if (slv->clear_rx_desc)
^~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1160:2: note: Taking false branch
if (slv->clear_rx_desc)
^
drivers/spi/spi-bcm2835.c:1163:6: note: Assuming field 'clear_rx_addr' is not equal to 0
if (slv->clear_rx_addr)
^~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1163:2: note: Taking true branch
if (slv->clear_rx_addr)
^
drivers/spi/spi-bcm2835.c:1164:20: note: Access to field 'device' results in a dereference of a null pointer (loaded from field 'dma_rx')
dma_unmap_single(ctlr->dma_rx->device->dev,
^
include/linux/dma-mapping.h:427:61: note: expanded from macro 'dma_unmap_single'
#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
^
Suppressed 15 warnings (15 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.
15 warnings generated.
Suppressed 15 warnings (15 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.
15 warnings generated.
Suppressed 15 warnings (15 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.
--
^~~~~~~
drivers/iio/light/veml6030.c:347:2: note: Taking false branch
if (ret < 0)
^
drivers/iio/light/veml6030.c:350:6: note: Assuming 'val' is not equal to 0
if (!val) {
^~~~
drivers/iio/light/veml6030.c:350:2: note: Taking false branch
if (!val) {
^
drivers/iio/light/veml6030.c:353:8: note: Assuming 'val' is not equal to 1
if ((val == 1) && (val2 == 600000))
^~~~~~~~
drivers/iio/light/veml6030.c:353:18: note: Left side of '&&' is false
if ((val == 1) && (val2 == 600000))
^
drivers/iio/light/veml6030.c:355:13: note: Assuming 'val' is equal to 3
else if ((val == 3) && (val2 == 200000))
^~~~~~~~
drivers/iio/light/veml6030.c:355:12: note: Left side of '&&' is true
else if ((val == 3) && (val2 == 200000))
^
drivers/iio/light/veml6030.c:355:27: note: Assuming 'val2' is equal to 200000
else if ((val == 3) && (val2 == 200000))
^~~~~~~~~~~~~~
drivers/iio/light/veml6030.c:355:8: note: Taking true branch
else if ((val == 3) && (val2 == 200000))
^
drivers/iio/light/veml6030.c:356:21: note: The right operand of '/' is a garbage value
period = 3200000 / y;
^ ~
drivers/iio/light/veml6030.c:358:21: warning: The right operand of '/' is a garbage value [clang-analyzer-core.UndefinedBinaryOperatorResult]
period = 6400000 / y;
^
drivers/iio/light/veml6030.c:611:2: note: Control jumps to 'case IIO_EV_INFO_PERIOD:' at line 614
switch (info) {
^
drivers/iio/light/veml6030.c:615:10: note: Calling 'veml6030_write_persistence'
return veml6030_write_persistence(indio_dev, val, val2);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iio/light/veml6030.c:343:22: note: 'y' declared without an initial value
int ret, period, x, y;
^
drivers/iio/light/veml6030.c:346:8: note: Calling 'veml6030_get_intgrn_tm'
ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iio/light/veml6030.c:221:6: note: Assuming 'ret' is not equal to 0
if (ret) {
^~~
drivers/iio/light/veml6030.c:221:2: note: Taking true branch
if (ret) {
^
drivers/iio/light/veml6030.c:224:3: note: Returning without writing to '*val2'
return ret;
^
drivers/iio/light/veml6030.c:346:8: note: Returning from 'veml6030_get_intgrn_tm'
ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iio/light/veml6030.c:347:6: note: Assuming 'ret' is >= 0
if (ret < 0)
^~~~~~~
drivers/iio/light/veml6030.c:347:2: note: Taking false branch
if (ret < 0)
^
drivers/iio/light/veml6030.c:350:6: note: Assuming 'val' is not equal to 0
if (!val) {
^~~~
drivers/iio/light/veml6030.c:350:2: note: Taking false branch
if (!val) {
^
drivers/iio/light/veml6030.c:353:8: note: Assuming 'val' is not equal to 1
if ((val == 1) && (val2 == 600000))
^~~~~~~~
drivers/iio/light/veml6030.c:353:18: note: Left side of '&&' is false
if ((val == 1) && (val2 == 600000))
^
drivers/iio/light/veml6030.c:355:13: note: Assuming 'val' is not equal to 3
else if ((val == 3) && (val2 == 200000))
^~~~~~~~
drivers/iio/light/veml6030.c:355:23: note: Left side of '&&' is false
else if ((val == 3) && (val2 == 200000))
^
drivers/iio/light/veml6030.c:357:13: note: Assuming 'val' is equal to 6
else if ((val == 6) && (val2 == 400000))
^~~~~~~~
drivers/iio/light/veml6030.c:357:12: note: Left side of '&&' is true
else if ((val == 6) && (val2 == 400000))
^
drivers/iio/light/veml6030.c:357:27: note: Assuming 'val2' is equal to 400000
else if ((val == 6) && (val2 == 400000))
^~~~~~~~~~~~~~
drivers/iio/light/veml6030.c:357:8: note: Taking true branch
else if ((val == 6) && (val2 == 400000))
^
drivers/iio/light/veml6030.c:358:21: note: The right operand of '/' is a garbage value
period = 6400000 / y;
^ ~
Suppressed 15 warnings (15 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.
17 warnings generated.
>> drivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (112 padding bytes, where 48 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct bcm2835_spidev {
~~~~~~~^~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:153:8: note: Excessive padding in 'struct bcm2835_spidev' (112 padding bytes, where 48 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explicit padding members
struct bcm2835_spidev {
~~~~~~~^~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1164:20: warning: Access to field 'device' results in a dereference of a null pointer (loaded from field 'dma_rx') [clang-analyzer-core.NullDereference]
dma_unmap_single(ctlr->dma_rx->device->dev,
^
drivers/spi/spi-bcm2835.c:1213:27: note: Calling 'spi_controller_get_devdata'
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/spi/spi.h:675:2: note: Returning without writing to 'ctlr->dma_rx'
return dev_get_drvdata(&ctlr->dev);
^
drivers/spi/spi-bcm2835.c:1213:27: note: Returning from 'spi_controller_get_devdata'
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1219:6: note: Assuming 'slv' is non-null
if (!slv) {
^~~~
drivers/spi/spi-bcm2835.c:1219:2: note: Taking false branch
if (!slv) {
^
drivers/spi/spi-bcm2835.c:1239:6: note: Assuming the condition is false
if (spi->mode & SPI_CPOL)
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1239:2: note: Taking false branch
if (spi->mode & SPI_CPOL)
^
drivers/spi/spi-bcm2835.c:1241:6: note: Assuming the condition is false
if (spi->mode & SPI_CPHA)
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1241:2: note: Taking false branch
if (spi->mode & SPI_CPHA)
^
drivers/spi/spi-bcm2835.c:1249:6: note: Assuming field 'dma_rx' is null
if (ctlr->dma_rx) {
^~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1249:2: note: Taking false branch
if (ctlr->dma_rx) {
^
drivers/spi/spi-bcm2835.c:1262:6: note: Assuming the condition is false
if (spi->mode & SPI_NO_CS)
^~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1262:2: note: Taking false branch
if (spi->mode & SPI_NO_CS)
^
drivers/spi/spi-bcm2835.c:1268:6: note: Assuming field 'cs_gpiod' is null
if (spi->cs_gpiod)
^~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1268:2: note: Taking false branch
if (spi->cs_gpiod)
^
drivers/spi/spi-bcm2835.c:1270:6: note: Assuming field 'chip_select' is <= 1
if (spi->chip_select > 1) {
^~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1270:2: note: Taking false branch
if (spi->chip_select > 1) {
^
drivers/spi/spi-bcm2835.c:1292:6: note: Assuming 'chip' is non-null
if (!chip)
^~~~~
drivers/spi/spi-bcm2835.c:1292:2: note: Taking false branch
if (!chip)
^
drivers/spi/spi-bcm2835.c:1299:2: note: Taking true branch
if (IS_ERR(spi->cs_gpiod)) {
^
drivers/spi/spi-bcm2835.c:1301:3: note: Control jumps to line 1311
goto err_cleanup;
^
drivers/spi/spi-bcm2835.c:1311:2: note: Calling 'bcm2835_spi_cleanup'
bcm2835_spi_cleanup(spi);
^~~~~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1160:6: note: Assuming field 'clear_rx_desc' is null
if (slv->clear_rx_desc)
^~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1160:2: note: Taking false branch
if (slv->clear_rx_desc)
^
drivers/spi/spi-bcm2835.c:1163:6: note: Assuming field 'clear_rx_addr' is not equal to 0
if (slv->clear_rx_addr)
^~~~~~~~~~~~~~~~~~
drivers/spi/spi-bcm2835.c:1163:2: note: Taking true branch
if (slv->clear_rx_addr)
^
drivers/spi/spi-bcm2835.c:1164:20: note: Access to field 'device' results in a dereference of a null pointer (loaded from field 'dma_rx')
dma_unmap_single(ctlr->dma_rx->device->dev,
^
include/linux/dma-mapping.h:427:61: note: expanded from macro 'dma_unmap_single'
#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
^
Suppressed 15 warnings (15 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.
17 warnings generated.
fs/locks.c:2589:3: warning: Value stored to 'cmd' is never read [clang-analyzer-deadcode.DeadStores]
cmd = F_GETLK64;
^
fs/locks.c:2589:3: note: Value stored to 'cmd' is never read
Suppressed 16 warnings (16 in non-user code).

vim +153 drivers/spi/spi-bcm2835.c

142
143 /**
144 * struct bcm2835_spidev - BCM2835 SPI slave
145 * @prepare_cs: precalculated CS register value for ->prepare_message()
146 * (uses slave-specific clock polarity and phase settings)
147 * @clear_rx_desc: preallocated RX DMA descriptor used for TX-only transfers
148 * (cyclically clears RX FIFO by writing @clear_rx_cs to CS register)
149 * @clear_rx_addr: bus address of @clear_rx_cs
150 * @clear_rx_cs: precalculated CS register value to clear RX FIFO
151 * (uses slave-specific clock polarity and phase settings)
152 */
> 153 struct bcm2835_spidev {
154 u32 prepare_cs;
155 struct dma_async_tx_descriptor *clear_rx_desc;
156 dma_addr_t clear_rx_addr;
157 u32 clear_rx_cs ____cacheline_aligned;
158 };
159

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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