drivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (48 padding bytes, where 16 is optimal). Optimal fields order: clear_rx_cs, prepare_cs, clear_rx_desc, clear_rx_addr, consider reordering the fields or adding explicit ...

From: kernel test robot
Date: Tue Jul 26 2022 - 20:44:47 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5de64d44968e4ae66ebdb0a2d08b443f189d3651
commit: ec679bda639fe84b78d473526ae27c74dea383fb spi: bcm2835: Allow arbitrary number of slaves
date: 1 year, 2 months ago
config: arm-randconfig-c002-20220722 (https://download.01.org/0day-ci/archive/20220727/202207270819.2m20mks4-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 72686d68c137551cce816416190a18d45b4d4e2a)
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@xxxxxxxxx>

clang-analyzer warnings: (new ones prefixed by >>)
^~~~~~~
drivers/clocksource/sh_mtu2.c:417:2: note: Taking false branch
if (ret < 0)
^
drivers/clocksource/sh_mtu2.c:420:22: note: Assuming '__UNIQUE_ID___x183' is >= '__UNIQUE_ID___y184'
mtu->num_channels = min_t(unsigned int, ret,
^
include/linux/minmax.h:110:27: note: expanded from macro 'min_t'
#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:44:3: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:39:3: note: expanded from macro '__cmp_once'
__cmp(unique_x, unique_y, op); })
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:34:26: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
^~~~~~~~~~
drivers/clocksource/sh_mtu2.c:420:22: note: '?' condition is false
mtu->num_channels = min_t(unsigned int, ret,
^
include/linux/minmax.h:110:27: note: expanded from macro 'min_t'
#define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
^
include/linux/minmax.h:44:3: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
^
include/linux/minmax.h:39:3: note: expanded from macro '__cmp_once'
__cmp(unique_x, unique_y, op); })
^
include/linux/minmax.h:34:26: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
^
drivers/clocksource/sh_mtu2.c:425:6: note: Assuming field 'channels' is not equal to NULL
if (mtu->channels == NULL) {
^~~~~~~~~~~~~~~~~~~~~
drivers/clocksource/sh_mtu2.c:425:2: note: Taking false branch
if (mtu->channels == NULL) {
^
drivers/clocksource/sh_mtu2.c:430:2: note: Loop condition is true. Entering loop body
for (i = 0; i < mtu->num_channels; ++i) {
^
drivers/clocksource/sh_mtu2.c:432:7: note: 'ret' is >= 0
if (ret < 0)
^~~
drivers/clocksource/sh_mtu2.c:432:3: note: Taking false branch
if (ret < 0)
^
drivers/clocksource/sh_mtu2.c:430:2: note: Loop condition is true. Entering loop body
for (i = 0; i < mtu->num_channels; ++i) {
^
drivers/clocksource/sh_mtu2.c:432:7: note: 'ret' is >= 0
if (ret < 0)
^~~
drivers/clocksource/sh_mtu2.c:432:3: note: Taking false branch
if (ret < 0)
^
drivers/clocksource/sh_mtu2.c:430:2: note: Loop condition is true. Entering loop body
for (i = 0; i < mtu->num_channels; ++i) {
^
drivers/clocksource/sh_mtu2.c:432:7: note: Assuming 'ret' is >= 0
if (ret < 0)
^~~~~~~
drivers/clocksource/sh_mtu2.c:432:3: note: Taking false branch
if (ret < 0)
^
drivers/clocksource/sh_mtu2.c:430:37: note: The value 3 is assigned to 'i'
for (i = 0; i < mtu->num_channels; ++i) {
^~~
drivers/clocksource/sh_mtu2.c:430:14: note: Assuming 'i' is < field 'num_channels'
for (i = 0; i < mtu->num_channels; ++i) {
^~~~~~~~~~~~~~~~~~~~~
drivers/clocksource/sh_mtu2.c:430:2: note: Loop condition is true. Entering loop body
for (i = 0; i < mtu->num_channels; ++i) {
^
drivers/clocksource/sh_mtu2.c:431:50: note: Passing the value 3 via 2nd parameter 'index'
ret = sh_mtu2_setup_channel(&mtu->channels[i], i, mtu);
^
drivers/clocksource/sh_mtu2.c:431:9: note: Calling 'sh_mtu2_setup_channel'
ret = sh_mtu2_setup_channel(&mtu->channels[i], i, mtu);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/clocksource/sh_mtu2.c:350:6: note: Assuming 'irq' is >= 0
if (irq < 0) {
^~~~~~~
drivers/clocksource/sh_mtu2.c:350:2: note: Taking false branch
if (irq < 0) {
^
drivers/clocksource/sh_mtu2.c:358:6: note: Assuming 'ret' is 0
if (ret) {
^~~
drivers/clocksource/sh_mtu2.c:358:2: note: Taking false branch
if (ret) {
^
drivers/clocksource/sh_mtu2.c:364:26: note: The right operand of '+' is a garbage value due to array index out of bounds
ch->base = mtu->mapbase + sh_mtu2_channel_offsets[index];
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
2 warnings generated.
>> drivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (48 padding bytes, where 16 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' (48 padding bytes, where 16 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)
^
2 warnings generated.
drivers/leds/leds-pca955x.c:402:11: warning: Access to field 'name' results in a dereference of a null pointer [clang-analyzer-core.NullDereference]
name = to_of_node(child)->name;
^
include/linux/of.h:161:2: note: expanded from macro 'to_of_node'
({ \
^
drivers/leds/leds-pca955x.c:442:6: note: Assuming 'pdata' is null
--
^
security/apparmor/domain.c:1407:9: note: Assuming 'i' is >= field 'size'
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/apparmor/include/lib.h:228:7: note: expanded from macro 'fn_label_build'
if (vec_setup(label, __lvec, (L)->size, (GFP))) { \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/apparmor/include/label.h:33:15: note: expanded from macro 'vec_setup'
for (i = 0; i < (N); i++) \
^~~~~~~
security/apparmor/domain.c:1407:9: note: Loop condition is false. Execution continues on line 1407
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^
security/apparmor/include/lib.h:228:7: note: expanded from macro 'fn_label_build'
if (vec_setup(label, __lvec, (L)->size, (GFP))) { \
^
security/apparmor/include/label.h:33:3: note: expanded from macro 'vec_setup'
for (i = 0; i < (N); i++) \
^
security/apparmor/domain.c:1407:9: note: '__lvec' is non-null
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/apparmor/include/lib.h:228:24: note: expanded from macro 'fn_label_build'
if (vec_setup(label, __lvec, (L)->size, (GFP))) { \
^~~~~~
security/apparmor/include/label.h:37:3: note: expanded from macro 'vec_setup'
(V) ? 0 : -ENOMEM; \
^
security/apparmor/domain.c:1407:9: note: '?' condition is true
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^
security/apparmor/include/lib.h:228:7: note: expanded from macro 'fn_label_build'
if (vec_setup(label, __lvec, (L)->size, (GFP))) { \
^
security/apparmor/include/label.h:37:2: note: expanded from macro 'vec_setup'
(V) ? 0 : -ENOMEM; \
^
security/apparmor/domain.c:1407:9: note: Taking false branch
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^
security/apparmor/include/lib.h:228:3: note: expanded from macro 'fn_label_build'
if (vec_setup(label, __lvec, (L)->size, (GFP))) { \
^
security/apparmor/domain.c:1407:9: note: Loop condition is false. Execution continues on line 1407
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^
security/apparmor/include/lib.h:233:3: note: expanded from macro 'fn_label_build'
label_for_each(__i, (L), (P)) { \
^
security/apparmor/include/label.h:158:2: note: expanded from macro 'label_for_each'
for ((I).i = 0; ((P) = (L)->vec[(I).i]); ++((I).i))
^
security/apparmor/domain.c:1407:9: note: The value 0 is assigned to '__j'
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/apparmor/include/lib.h:240:8: note: expanded from macro 'fn_label_build'
for (__j = __count = 0; __j < (L)->size; __j++) \
^~~~~~~~~~~~~~~~~
security/apparmor/domain.c:1407:9: note: Loop condition is true. Entering loop body
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^
security/apparmor/include/lib.h:240:3: note: expanded from macro 'fn_label_build'
for (__j = __count = 0; __j < (L)->size; __j++) \
^
security/apparmor/domain.c:1407:9: note: Access to field 'size' results in a dereference of a null pointer
new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^
security/apparmor/include/lib.h:284:2: note: expanded from macro 'fn_label_build_in_ns'
fn_label_build((L), (P), (GFP), \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/apparmor/include/lib.h:241:15: note: expanded from macro 'fn_label_build'
__count += __lvec[__j]->size; \
^~~~~~~~~~~~~~~~~
Suppressed 2 warnings (1 in non-user code, 1 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.
2 warnings generated.
>> drivers/spi/spi-bcm2835.c:153:8: warning: Excessive padding in 'struct bcm2835_spidev' (48 padding bytes, where 16 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' (48 padding bytes, where 16 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)
^
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.
Suppressed 1 warnings (1 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

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