drivers/iio/adc/ad7476.c:29:8: warning: Excessive padding in 'struct ad7476_chip_info' (10 padding bytes, where 2 is optimal). Optimal fields order: reset, channel, convst_channel, int_vref_uv, has_vref, has_vdrive, consider reordering the fields or addin...

From: kernel test robot
Date: Fri Jul 08 2022 - 12:16:44 EST

Next message: John Garry: "Re: [PATCH v5 0/5] DMA mapping changes for SCSI core"
Previous message: kernel test robot: "[arm-integrator:kernel-in-vmalloc-v5.19-rc1 27/35] ld.lld: error: arch/powerpc/kernel/vdso/vdso32.lds:244: unknown directive: static"
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e8a4e1c1bb697b1d9fc48f0e56dc0f50bc024bee
commit: 7bf50a968a1cd02728e9120ad0216dc80f7a6fb0 iio:adc:ad7476: Handle the different regulators used by various parts.
date: 1 year, 2 months ago
config: s390-randconfig-c005-20220703 (https://download.01.org/0day-ci/archive/20220709/202207090025.tVBfb94P-lkp@xxxxxxxxx/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 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=7bf50a968a1cd02728e9120ad0216dc80f7a6fb0
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 7bf50a968a1cd02728e9120ad0216dc80f7a6fb0
# 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@xxxxxxxxx>

clang-analyzer warnings: (new ones prefixed by >>)
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/message/fusion/mptspi.c:1259:3: note: Loop condition is false. Exiting loop
container_of(work, struct work_queue_wrapper, work);
^
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/message/fusion/mptspi.c:1269:6: note: Assuming field 'spi_pending' is 0
if (hd->spi_pending) {
^~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:1269:2: note: Taking false branch
if (hd->spi_pending) {
^
drivers/message/fusion/mptspi.c:1281:3: note: Loop condition is true. Entering loop body
shost_for_each_device(sdev, ioc->sh)
^
include/scsi/scsi_device.h:380:2: note: expanded from macro 'shost_for_each_device'
for ((sdev) = __scsi_iterate_devices((shost), NULL); \
^
drivers/message/fusion/mptspi.c:1282:4: note: Calling 'mptspi_dv_device'
mptspi_dv_device(hd, sdev);
^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:690:6: note: Assuming field 'channel' is not equal to 0
if (sdev->channel == 0 &&
^~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:690:25: note: Left side of '&&' is false
if (sdev->channel == 0 &&
^
drivers/message/fusion/mptspi.c:695:6: note: Assuming field 'channel' is not equal to 1
if (sdev->channel == 1 &&
^~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:695:25: note: Left side of '&&' is false
if (sdev->channel == 1 &&
^
drivers/message/fusion/mptspi.c:706:6: note: Assuming field 'channel' is not equal to 1
if (sdev->channel == 1 &&
^~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:706:25: note: Left side of '&&' is false
if (sdev->channel == 1 &&
^
drivers/message/fusion/mptspi.c:711:2: note: Calling 'mptspi_read_parameters'
mptspi_read_parameters(sdev->sdev_target);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:600:2: note: Calling 'mptspi_read_spi_device_pg0'
mptspi_read_spi_device_pg0(starget, &spi_dev_pg0);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:527:6: note: Assuming field 'channel' is equal to 0
if (starget->channel == 0 &&
^~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:527:6: note: Left side of '&&' is true
drivers/message/fusion/mptspi.c:528:6: note: Assuming the condition is true
mptspi_is_raid(hd, starget->id))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:527:2: note: Taking true branch
if (starget->channel == 0 &&
^
drivers/message/fusion/mptspi.c:529:3: note: Returning without writing to 'pass_pg0->NegotiatedParameters'
return -1;
^
drivers/message/fusion/mptspi.c:600:2: note: Returning from 'mptspi_read_spi_device_pg0'
mptspi_read_spi_device_pg0(starget, &spi_dev_pg0);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/message/fusion/mptspi.c:602:9: note: 1st function call argument is an uninitialized value
nego = le32_to_cpu(spi_dev_pg0.NegotiatedParameters);
^
include/linux/byteorder/generic.h:89:21: note: expanded from macro 'le32_to_cpu'
#define le32_to_cpu __le32_to_cpu
^
include/uapi/linux/byteorder/big_endian.h:34:26: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/uapi/linux/swab.h:115:28: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^ ~~~~~~~~~~
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.
21 warnings generated.
>> drivers/iio/adc/ad7476.c:29:8: warning: Excessive padding in 'struct ad7476_chip_info' (10 padding bytes, where 2 is optimal). Optimal fields order: reset, channel, convst_channel, int_vref_uv, has_vref, has_vdrive, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct ad7476_chip_info {
~~~~~~~^~~~~~~~~~~~~~~~~~
drivers/iio/adc/ad7476.c:29:8: note: Excessive padding in 'struct ad7476_chip_info' (10 padding bytes, where 2 is optimal). Optimal fields order: reset, channel, convst_channel, int_vref_uv, has_vref, has_vdrive, consider reordering the fields or adding explicit padding members
struct ad7476_chip_info {
~~~~~~~^~~~~~~~~~~~~~~~~~
>> drivers/iio/adc/ad7476.c:39:8: warning: Excessive padding in 'struct ad7476_state' (472 padding bytes, where 216 is optimal). Optimal fields order: data, spi, chip_info, ref_reg, convst_gpio, msg, xfer, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct ad7476_state {
~~~~~~~^~~~~~~~~~~~~~
drivers/iio/adc/ad7476.c:39:8: note: Excessive padding in 'struct ad7476_state' (472 padding bytes, where 216 is optimal). Optimal fields order: data, spi, chip_info, ref_reg, convst_gpio, msg, xfer, consider reordering the fields or adding explicit padding members
struct ad7476_state {
~~~~~~~^~~~~~~~~~~~~~
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.
20 warnings generated.
drivers/iio/adc/ad7766.c:35:8: warning: Excessive padding in 'struct ad7766' (392 padding bytes, where 136 is optimal). Optimal fields order: data, chip_info, spi, mclk, pd_gpio, trig, reg, msg, xfer, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct ad7766 {
~~~~~~~^~~~~~~~
drivers/iio/adc/ad7766.c:35:8: note: Excessive padding in 'struct ad7766' (392 padding bytes, where 136 is optimal). Optimal fields order: data, chip_info, spi, mclk, pd_gpio, trig, reg, msg, xfer, consider reordering the fields or adding explicit padding members
struct ad7766 {
~~~~~~~^~~~~~~~
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.
20 warnings generated.
drivers/iio/adc/ad7768-1.c:154:8: warning: Excessive padding in 'struct ad7768_state' (388 padding bytes, where 132 is optimal). Optimal fields order: data, mclk_freq, spi, vref, mclk, trig, gpio_sync_in, labels, lock, completion, samp_freq, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding]
struct ad7768_state {
~~~~~~~^~~~~~~~~~~~~~
drivers/iio/adc/ad7768-1.c:154:8: note: Excessive padding in 'struct ad7768_state' (388 padding bytes, where 132 is optimal). Optimal fields order: data, mclk_freq, spi, vref, mclk, trig, gpio_sync_in, labels, lock, completion, samp_freq, consider reordering the fields or adding explicit padding members
struct ad7768_state {
~~~~~~~^~~~~~~~~~~~~~
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.
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.
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.
7 warnings generated.
include/linux/hid.h:1004:9: warning: Access to field 'name' results in a dereference of a null pointer (loaded from variable 'input') [clang-analyzer-core.NullDereference]
input->name, c, type);
^
drivers/hid/hid-twinhan.c:65:6: note: Assuming the condition is false
if ((usage->hid & HID_USAGE_PAGE) != HID_UP_KEYBOARD)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hid/hid-twinhan.c:65:2: note: Taking false branch
if ((usage->hid & HID_USAGE_PAGE) != HID_UP_KEYBOARD)
^
drivers/hid/hid-twinhan.c:68:2: note: Control jumps to 'case 31:' at line 83
switch (usage->hid & HID_USAGE) {
^
drivers/hid/hid-twinhan.c:83:14: note: Calling 'hid_map_usage_clear'
case 0x01f: th_map_key_clear(KEY_NUMERIC_2); break;
^
drivers/hid/hid-twinhan.c:59:29: note: expanded from macro 'th_map_key_clear'
#define th_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/hid.h:1032:2: note: Calling 'hid_map_usage'
hid_map_usage(hidinput, usage, bit, max, type, c);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/hid.h:979:2: note: 'input' initialized here
struct input_dev *input = hidinput->input;
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/hid.h:983:2: note: Control jumps to 'case 1:' at line 992
switch (type) {
^
include/linux/hid.h:995:3: note: Execution continues on line 1002
break;
^
include/linux/hid.h:1002:15: note: 'c' is <= 'limit'
if (unlikely(c > limit || !bmap)) {
^
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
include/linux/hid.h:1002:15: note: Left side of '||' is false
if (unlikely(c > limit || !bmap)) {
^
include/linux/hid.h:1002:28: note: Assuming 'bmap' is null
if (unlikely(c > limit || !bmap)) {
^
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
include/linux/hid.h:1002:28: note: Assuming pointer value is null
if (unlikely(c > limit || !bmap)) {
^
include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
include/linux/hid.h:1002:2: note: Taking true branch
if (unlikely(c > limit || !bmap)) {
^
include/linux/hid.h:1003:3: note: Assuming the condition is true
pr_warn_ratelimited("%s: Invalid code %d type %d\n",
^
include/linux/printk.h:528:2: note: expanded from macro 'pr_warn_ratelimited'
printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/printk.h:511:6: note: expanded from macro 'printk_ratelimited'
if (__ratelimit(&_rs)) \
^~~~~~~~~~~~~~~~~
include/linux/ratelimit_types.h:41:28: note: expanded from macro '__ratelimit'
#define __ratelimit(state) ___ratelimit(state, __func__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/hid.h:1003:3: note: Taking true branch
pr_warn_ratelimited("%s: Invalid code %d type %d\n",

vim +29 drivers/iio/adc/ad7476.c

87c5b10fd97937 drivers/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-17 28
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 @29 struct ad7476_chip_info {
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 30 unsigned int int_vref_uv;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 31 struct iio_chan_spec channel[2];
3a6af93dd66eba drivers/iio/adc/ad7476.c Dragos Bogdan 2020-03-11 32 /* channels used when convst gpio is defined */
3a6af93dd66eba drivers/iio/adc/ad7476.c Dragos Bogdan 2020-03-11 33 struct iio_chan_spec convst_channel[2];
87c5b10fd97937 drivers/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-17 34 void (*reset)(struct ad7476_state *);
7bf50a968a1cd0 drivers/iio/adc/ad7476.c Jonathan Cameron 2021-04-25 35 bool has_vref;
7bf50a968a1cd0 drivers/iio/adc/ad7476.c Jonathan Cameron 2021-04-25 36 bool has_vdrive;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 37 };
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 38
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 @39 struct ad7476_state {
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 40 struct spi_device *spi;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 41 const struct ad7476_chip_info *chip_info;
7bf50a968a1cd0 drivers/iio/adc/ad7476.c Jonathan Cameron 2021-04-25 42 struct regulator *ref_reg;
af37e4703d00ce drivers/iio/adc/ad7476.c Dragos Bogdan 2020-03-11 43 struct gpio_desc *convst_gpio;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 44 struct spi_transfer xfer;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 45 struct spi_message msg;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 46 /*
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 47 * DMA (thus cache coherency maintenance) requires the
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 48 * transfer buffers to live in their own cache lines.
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 49 * Make the buffer large enough for one 16 bit sample and one 64 bit
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 50 * aligned 64 bit timestamp.
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 51 */
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 52 unsigned char data[ALIGN(2, sizeof(s64)) + sizeof(s64)]
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 53 ____cacheline_aligned;
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 54 };
7a28fe3c93d6cd drivers/staging/iio/adc/ad7476.c Lars-Peter Clausen 2012-09-10 55

:::::: The code at line 29 was first introduced by commit
:::::: 7a28fe3c93d6cd920c84678a1bf45af8b4248577 staging:iio:ad7476: Squash driver into a single file.

:::::: TO: Lars-Peter Clausen <lars@xxxxxxxxxx>
:::::: CC: Jonathan Cameron <jic23@xxxxxxxxxx>

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

Next message: John Garry: "Re: [PATCH v5 0/5] DMA mapping changes for SCSI core"
Previous message: kernel test robot: "[arm-integrator:kernel-in-vmalloc-v5.19-rc1 27/35] ld.lld: error: arch/powerpc/kernel/vdso/vdso32.lds:244: unknown directive: static"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]