* [ammarfaizi2-block:google/android/kernel/common/android13-5.10 3142/9999] drivers/pci/controller/pcie-rcar-host.c:480:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-02-02 6:42 kernel test robot
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From: kernel test robot @ 2022-02-02 6:42 UTC (permalink / raw
To: kbuild
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CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
CC: "GNU/Weeb Mailing List" <gwml@gnuweeb.org>
CC: linux-kernel(a)vger.kernel.org
TO: Marc Zyngier <maz@kernel.org>
CC: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
tree: https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.10
head: fcc2bfb27307c6ab51031df9bae07a3ab5606959
commit: 00a2ac03d0c60813ebf06a8c6f1cdb5b9e92d169 [3142/9999] UPSTREAM: PCI: rcar: Convert to MSI domains
:::::: branch date: 10 hours ago
:::::: commit date: 7 months ago
config: arm-randconfig-c002-20220130 (https://download.01.org/0day-ci/archive/20220202/202202021401.1aIjCufA-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2cdbaca3943a4d6259119f185656328bd3805b68)
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://github.com/ammarfaizi2/linux-block/commit/00a2ac03d0c60813ebf06a8c6f1cdb5b9e92d169
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.10
git checkout 00a2ac03d0c60813ebf06a8c6f1cdb5b9e92d169
# 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 >>)
if (IS_ENABLED(CONFIG_DEBUG_FS))
^
drivers/gpio/gpio-adnp.c:464:6: note: 'is_irq_controller' is true
if (is_irq_controller) {
^~~~~~~~~~~~~~~~~
drivers/gpio/gpio-adnp.c:464:2: note: Taking true branch
if (is_irq_controller) {
^
drivers/gpio/gpio-adnp.c:467:9: note: Calling 'adnp_irq_setup'
err = adnp_irq_setup(adnp);
^~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-adnp.c:385:28: note: The result of the left shift is undefined due to shifting by '4294967292', which is greater or equal to the width of type 'int'
unsigned int num_regs = 1 << adnp->reg_shift, i;
^ ~~~~~~~~~~~~~~~
2 warnings generated.
Suppressed 2 warnings (2 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.
9 warnings generated.
drivers/char/applicom.c:574:5: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = do_ac_read(i, buf, &st_loc, &mailbox);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/applicom.c:574:5: note: Value stored to 'ret' is never read
ret = do_ac_read(i, buf, &st_loc, &mailbox);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/applicom.c:734:4: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:734:4: note: Value stored to 'ret' is never read
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:755:4: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:755:4: note: Value stored to 'ret' is never read
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:781:4: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:781:4: note: Value stored to 'ret' is never read
ret = -EFAULT;
^ ~~~~~~~
drivers/char/applicom.c:836:3: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -ENOTTY;
^ ~~~~~~~
drivers/char/applicom.c:836:3: note: Value stored to 'ret' is never read
ret = -ENOTTY;
^ ~~~~~~~
Suppressed 4 warnings (4 with check filters).
3 warnings generated.
drivers/char/ppdev.c:118:15: warning: Value stored to 'minor' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned int minor = iminor(file_inode(file));
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/ppdev.c:118:15: note: Value stored to 'minor' during its initialization is never read
unsigned int minor = iminor(file_inode(file));
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/ppdev.c:196:15: warning: Value stored to 'minor' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned int minor = iminor(file_inode(file));
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/ppdev.c:196:15: note: Value stored to 'minor' during its initialization is never read
unsigned int minor = iminor(file_inode(file));
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/char/ppdev.c:708:15: warning: Value stored to 'minor' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned int minor = iminor(inode);
^~~~~ ~~~~~~~~~~~~~
drivers/char/ppdev.c:708:15: note: Value stored to 'minor' during its initialization is never read
unsigned int minor = iminor(inode);
^~~~~ ~~~~~~~~~~~~~
1 warning generated.
Suppressed 1 warnings (1 with check filters).
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).
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.
2 warnings generated.
drivers/pci/controller/pci-tegra.c:2252:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct device *dev = port->pcie->dev;
^~~ ~~~~~~~~~~~~~~~
drivers/pci/controller/pci-tegra.c:2252:17: note: Value stored to 'dev' during its initialization is never read
struct device *dev = port->pcie->dev;
^~~ ~~~~~~~~~~~~~~~
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/pci/controller/pci-rcar-gen2.c:225:3: warning: Value stored to 'window_size' is never read [clang-analyzer-deadcode.DeadStores]
window_size = SZ_256M;
^
drivers/pci/controller/pci-rcar-gen2.c:225:3: note: Value stored to 'window_size' is never read
2 warnings generated.
>> drivers/pci/controller/pcie-rcar-host.c:480:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct device *dev = pcie->dev;
^~~ ~~~~~~~~~
drivers/pci/controller/pcie-rcar-host.c:480:17: note: Value stored to 'dev' during its initialization is never read
struct device *dev = pcie->dev;
^~~ ~~~~~~~~~
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/pci/controller/pci-v3-semi.c:604:6: warning: Value stored to 'pci_end' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
u64 pci_end = cpu_end - entry->offset;
^~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/controller/pci-v3-semi.c:604:6: note: Value stored to 'pci_end' during its initialization is never read
u64 pci_end = cpu_end - entry->offset;
^~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
drivers/rapidio/devices/rio_mport_cdev.c:300:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn]
return ret;
^
drivers/rapidio/devices/rio_mport_cdev.c:2069:6: note: Left side of '||' is false
if (atomic_read(&md->active) == 0)
^
arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read'
#define atomic_read(v) READ_ONCE((v)->counter)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:285:3: note: expanded from macro '__native_word'
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
^
drivers/rapidio/devices/rio_mport_cdev.c:2069:6: note: Left side of '||' is false
if (atomic_read(&md->active) == 0)
^
arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read'
#define atomic_read(v) READ_ONCE((v)->counter)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:285:3: note: expanded from macro '__native_word'
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
^
drivers/rapidio/devices/rio_mport_cdev.c:2069:6: note: Left side of '||' is true
if (atomic_read(&md->active) == 0)
^
arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read'
#define atomic_read(v) READ_ONCE((v)->counter)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:286:28: note: expanded from macro '__native_word'
sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
^
drivers/rapidio/devices/rio_mport_cdev.c:2069:6: note: Taking false branch
if (atomic_read(&md->active) == 0)
^
arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read'
#define atomic_read(v) READ_ONCE((v)->counter)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:323:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:311:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:303:3: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^
drivers/rapidio/devices/rio_mport_cdev.c:2069:6: note: Loop condition is false. Exiting loop
if (atomic_read(&md->active) == 0)
^
arch/arm/include/asm/atomic.h:25:24: note: expanded from macro 'atomic_read'
#define atomic_read(v) READ_ONCE((v)->counter)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:323:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:311:2: note: expanded from macro '_compiletime_assert'
vim +/dev +480 drivers/pci/controller/pcie-rcar-host.c
581d9434aa56b46 drivers/pci/host/pcie-rcar.c Phil Edworthy 2016-01-05 474
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 475 static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 476 {
78a0d7f2f5a3135 drivers/pci/controller/pcie-rcar-host.c Lad Prabhakar 2020-05-07 477 struct rcar_pcie_host *host = data;
78a0d7f2f5a3135 drivers/pci/controller/pcie-rcar-host.c Lad Prabhakar 2020-05-07 478 struct rcar_pcie *pcie = &host->pcie;
78a0d7f2f5a3135 drivers/pci/controller/pcie-rcar-host.c Lad Prabhakar 2020-05-07 479 struct rcar_msi *msi = &host->msi;
4ef80d72a6f1a37 drivers/pci/host/pcie-rcar.c Bjorn Helgaas 2016-10-10 @480 struct device *dev = pcie->dev;
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 481 unsigned long reg;
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 482
b77188495de64ab drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-06-30 483 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 484
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 485 /* MSI & INTx share an interrupt - we only handle MSI here */
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 486 if (!reg)
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 487 return IRQ_NONE;
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 488
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 489 while (reg) {
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 490 unsigned int index = find_first_bit(®, 32);
a27beb5820d1a52 drivers/pci/controller/pcie-rcar.c Wolfram Sang 2019-03-17 491 unsigned int msi_irq;
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 492
00a2ac03d0c6081 drivers/pci/controller/pcie-rcar-host.c Marc Zyngier 2021-03-30 493 msi_irq = irq_find_mapping(msi->domain->parent, index);
a27beb5820d1a52 drivers/pci/controller/pcie-rcar.c Wolfram Sang 2019-03-17 494 if (msi_irq) {
a27beb5820d1a52 drivers/pci/controller/pcie-rcar.c Wolfram Sang 2019-03-17 495 generic_handle_irq(msi_irq);
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 496 } else {
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 497 /* Unknown MSI, just clear it */
4ef80d72a6f1a37 drivers/pci/host/pcie-rcar.c Bjorn Helgaas 2016-10-10 498 dev_dbg(dev, "unexpected MSI\n");
00a2ac03d0c6081 drivers/pci/controller/pcie-rcar-host.c Marc Zyngier 2021-03-30 499 rcar_pci_write_reg(pcie, BIT(index), PCIEMSIFR);
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 500 }
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 501
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 502 /* see if there's any more pending in this vector */
b77188495de64ab drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-06-30 503 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 504 }
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 505
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 506 return IRQ_HANDLED;
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 507 }
290c1fb35860540 drivers/pci/host/pcie-rcar.c Phil Edworthy 2014-05-12 508
:::::: The code at line 480 was first introduced by commit
:::::: 4ef80d72a6f1a379e471960f48e051ab5e102fc0 PCI: rcar: Add local struct device pointers
:::::: TO: Bjorn Helgaas <bhelgaas@google.com>
:::::: CC: Bjorn Helgaas <bhelgaas@google.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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2022-02-02 6:42 [ammarfaizi2-block:google/android/kernel/common/android13-5.10 3142/9999] drivers/pci/controller/pcie-rcar-host.c:480:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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