From: kernel test robot <lkp@intel.com>
To: kbuild@lists.01.org
Subject: drivers/pci/endpoint/pci-epc-mem.c:29:7: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
Date: Wed, 08 Dec 2021 14:12:31 +0800 [thread overview]
Message-ID: <202112081440.es8aIITo-lkp@intel.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 29593 bytes --]
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Jakub Jelinek <jakub@redhat.com>
CC: "Peter Zijlstra (Intel)" <peterz@infradead.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: cd8c917a56f20f48748dd43d9ae3caff51d5b987
commit: 2f78788b55baa3410b1ec91a576286abe1ad4d6a ilog2: improve ilog2 for constant arguments
date: 12 months ago
:::::: branch date: 29 hours ago
:::::: commit date: 12 months ago
config: arm-randconfig-c002-20211126 (https://download.01.org/0day-ci/archive/20211208/202112081440.es8aIITo-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5162b558d8c0b542e752b037e72a69d5fd51eb1e)
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=2f78788b55baa3410b1ec91a576286abe1ad4d6a
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 2f78788b55baa3410b1ec91a576286abe1ad4d6a
# 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 >>)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/lockdep.c:1982:2: note: The value of 'parent' is assigned to 'first_parent'
first_parent = parent;
^~~~~~~~~~~~~~~~~~~~~
kernel/locking/lockdep.c:1984:9: note: Assuming pointer value is null
while (parent) {
^~~~~~
kernel/locking/lockdep.c:1984:2: note: Loop condition is false. Execution continues on line 1989
while (parent) {
^
kernel/locking/lockdep.c:1991:10: note: Passing null pointer value via 3rd parameter 'prt'
first_parent);
^~~~~~~~~~~~
kernel/locking/lockdep.c:1990:2: note: Calling 'print_circular_lock_scenario'
print_circular_lock_scenario(check_src, check_tgt,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/lockdep.c:1823:30: note: Access to field 'class' results in a dereference of a null pointer (loaded from variable 'prt')
struct lock_class *parent = prt->class;
^~~
Suppressed 13 warnings (11 in non-user code, 2 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.
8 warnings generated.
Suppressed 8 warnings (8 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.
4 warnings generated.
Suppressed 4 warnings (4 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.
4 warnings generated.
Suppressed 4 warnings (4 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.
8 warnings generated.
Suppressed 8 warnings (8 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.
8 warnings generated.
Suppressed 8 warnings (8 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.
18 warnings generated.
crypto/sha512_generic.c:148:2: warning: Value stored to 'a' is never read [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:2: note: Value stored to 'a' is never read
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:6: warning: Although the value stored to 'b' is used in the enclosing expression, the value is never actually read from 'b' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:6: note: Although the value stored to 'b' is used in the enclosing expression, the value is never actually read from 'b'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:10: warning: Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:10: note: Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:14: warning: Although the value stored to 'd' is used in the enclosing expression, the value is never actually read from 'd' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:14: note: Although the value stored to 'd' is used in the enclosing expression, the value is never actually read from 'd'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:18: warning: Although the value stored to 'e' is used in the enclosing expression, the value is never actually read from 'e' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:18: note: Although the value stored to 'e' is used in the enclosing expression, the value is never actually read from 'e'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:22: warning: Although the value stored to 'f' is used in the enclosing expression, the value is never actually read from 'f' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:22: note: Although the value stored to 'f' is used in the enclosing expression, the value is never actually read from 'f'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:26: warning: Although the value stored to 'g' is used in the enclosing expression, the value is never actually read from 'g' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:26: note: Although the value stored to 'g' is used in the enclosing expression, the value is never actually read from 'g'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~~~~~
crypto/sha512_generic.c:148:30: warning: Although the value stored to 'h' is used in the enclosing expression, the value is never actually read from 'h' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~
crypto/sha512_generic.c:148:30: note: Although the value stored to 'h' is used in the enclosing expression, the value is never actually read from 'h'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~~~~~~
crypto/sha512_generic.c:148:34: warning: Although the value stored to 't1' is used in the enclosing expression, the value is never actually read from 't1' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~
crypto/sha512_generic.c:148:34: note: Although the value stored to 't1' is used in the enclosing expression, the value is never actually read from 't1'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~~~~~~
crypto/sha512_generic.c:148:39: warning: Although the value stored to 't2' is used in the enclosing expression, the value is never actually read from 't2' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~
crypto/sha512_generic.c:148:39: note: Although the value stored to 't2' is used in the enclosing expression, the value is never actually read from 't2'
a = b = c = d = e = f = g = h = t1 = t2 = 0;
^ ~
Suppressed 8 warnings (8 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.
8 warnings generated.
>> drivers/pci/endpoint/pci-epc-mem.c:29:7: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
size >>= page_shift;
^
drivers/pci/endpoint/pci-epc-mem.c:244:7: note: 'mem' is non-null
if (!mem) {
^~~
drivers/pci/endpoint/pci-epc-mem.c:244:2: note: Taking false branch
if (!mem) {
^
drivers/pci/endpoint/pci-epc-mem.c:250:15: note: '?' condition is false
page_shift = ilog2(page_size);
^
include/linux/log2.h:158:2: note: expanded from macro 'ilog2'
__builtin_constant_p(n) ? \
^
drivers/pci/endpoint/pci-epc-mem.c:250:15: note: '?' condition is true
page_shift = ilog2(page_size);
^
include/linux/log2.h:161:2: note: expanded from macro 'ilog2'
(sizeof(n) <= 4) ? \
^
drivers/pci/endpoint/pci-epc-mem.c:254:10: note: Calling 'pci_epc_mem_get_order'
order = pci_epc_mem_get_order(mem, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epc-mem.c:26:28: note: '?' condition is false
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:158:2: note: expanded from macro 'ilog2'
__builtin_constant_p(n) ? \
^
drivers/pci/endpoint/pci-epc-mem.c:26:28: note: '?' condition is true
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:161:2: note: expanded from macro 'ilog2'
(sizeof(n) <= 4) ? \
^
drivers/pci/endpoint/pci-epc-mem.c:26:28: note: Calling '__ilog2_u32'
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:162:2: note: expanded from macro 'ilog2'
__ilog2_u32(n) : \
^~~~~~~~~~~~~~
include/linux/log2.h:24:2: note: Returning the value -1
return fls(n) - 1;
^~~~~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epc-mem.c:26:28: note: Returning from '__ilog2_u32'
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:162:2: note: expanded from macro 'ilog2'
__ilog2_u32(n) : \
^~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epc-mem.c:26:2: note: 'page_shift' initialized to 4294967295
unsigned int page_shift = ilog2(mem->window.page_size);
^~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epc-mem.c:29:7: note: Assigned value is garbage or undefined
size >>= page_shift;
^ ~~~~~~~~~~
Suppressed 7 warnings (7 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.
8 warnings generated.
drivers/pci/endpoint/functions/pci-epf-test.c:758:17: warning: Access to field 'msix_capable' results in a dereference of a null pointer (loaded from variable 'epc_features') [clang-analyzer-core.NullDereference]
msix_capable = epc_features->msix_capable;
^
drivers/pci/endpoint/functions/pci-epf-test.c:829:19: note: Assuming 'epc' is non-null
if (WARN_ON_ONCE(!epc))
^
include/asm-generic/bug.h:145:27: note: expanded from macro 'WARN_ON_ONCE'
int __ret_warn_once = !!(condition); \
^~~~~~~~~
drivers/pci/endpoint/functions/pci-epf-test.c:829:6: note: '__ret_warn_once' is 0
if (WARN_ON_ONCE(!epc))
^
include/asm-generic/bug.h:147:15: note: expanded from macro 'WARN_ON_ONCE'
if (unlikely(__ret_warn_once && !__warned)) { \
^~~~~~~~~~~~~~~
include/linux/compiler.h:48:41: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^
include/linux/compiler.h:33:34: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
drivers/pci/endpoint/functions/pci-epf-test.c:829:6: note: Left side of '&&' is false
if (WARN_ON_ONCE(!epc))
^
include/asm-generic/bug.h:147:31: note: expanded from macro 'WARN_ON_ONCE'
if (unlikely(__ret_warn_once && !__warned)) { \
^
drivers/pci/endpoint/functions/pci-epf-test.c:829:6: note: '__ret_warn_once' is 0
if (WARN_ON_ONCE(!epc))
^
include/asm-generic/bug.h:147:15: note: expanded from macro 'WARN_ON_ONCE'
if (unlikely(__ret_warn_once && !__warned)) { \
^~~~~~~~~~~~~~~
include/linux/compiler.h:48:68: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^
include/linux/compiler.h:35:19: note: expanded from macro '__branch_check__'
expect, is_constant); \
^~~~~~~~~~~
drivers/pci/endpoint/functions/pci-epf-test.c:829:6: note: Left side of '&&' is false
if (WARN_ON_ONCE(!epc))
--
^~~~
drivers/net/ethernet/brocade/bna/bnad.c:1243:3: note: Taking false branch
if (!ccb)
^
drivers/net/ethernet/brocade/bna/bnad.c:1248:3: note: Loop condition is true. Entering loop body
for (j = 0; j < BNAD_MAX_RXQ_PER_RXP; j++) {
^
drivers/net/ethernet/brocade/bna/bnad.c:1250:8: note: Assuming 'rcb' is non-null
if (!rcb)
^~~~
drivers/net/ethernet/brocade/bna/bnad.c:1250:4: note: Taking false branch
if (!rcb)
^
drivers/net/ethernet/brocade/bna/bnad.c:1253:4: note: Calling 'bnad_rxq_alloc_init'
bnad_rxq_alloc_init(bnad, rcb);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:266:10: note: Calling 'get_order'
order = get_order(rcb->rxq->buffer_size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/getorder.h:31:2: note: Taking false branch
if (__builtin_constant_p(size)) {
^
include/asm-generic/getorder.h:44:9: note: Calling 'fls'
return fls(size);
^~~~~~~~~
include/asm-generic/bitops/fls.h:15:2: note: 'r' initialized to 32
int r = 32;
^~~~~
include/asm-generic/bitops/fls.h:17:6: note: Assuming 'x' is not equal to 0, which participates in a condition later
if (!x)
^~
include/asm-generic/bitops/fls.h:17:2: note: Taking false branch
if (!x)
^
include/asm-generic/bitops/fls.h:19:6: note: Assuming the condition is false
if (!(x & 0xffff0000u)) {
^~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/fls.h:19:2: note: Taking false branch
if (!(x & 0xffff0000u)) {
^
include/asm-generic/bitops/fls.h:23:6: note: Assuming the condition is false
if (!(x & 0xff000000u)) {
^~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/fls.h:23:2: note: Taking false branch
if (!(x & 0xff000000u)) {
^
include/asm-generic/bitops/fls.h:27:6: note: Assuming the condition is false
if (!(x & 0xf0000000u)) {
^~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/fls.h:27:2: note: Taking false branch
if (!(x & 0xf0000000u)) {
^
include/asm-generic/bitops/fls.h:31:6: note: Assuming the condition is false
if (!(x & 0xc0000000u)) {
^~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/fls.h:31:2: note: Taking false branch
if (!(x & 0xc0000000u)) {
^
include/asm-generic/bitops/fls.h:35:6: note: Assuming the condition is false
if (!(x & 0x80000000u)) {
^~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/fls.h:35:2: note: Taking false branch
if (!(x & 0x80000000u)) {
^
include/asm-generic/bitops/fls.h:39:2: note: Returning the value 32 (loaded from 'r')
return r;
^~~~~~~~
include/asm-generic/getorder.h:44:9: note: Returning from 'fls'
return fls(size);
^~~~~~~~~
include/asm-generic/getorder.h:44:2: note: Returning the value 32
return fls(size);
^~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:266:10: note: Returning from 'get_order'
order = get_order(rcb->rxq->buffer_size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:266:2: note: The value 32 is assigned to 'order'
order = get_order(rcb->rxq->buffer_size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:270:6: note: Assuming the condition is true
if (bna_is_small_rxq(rcb->id)) {
^
drivers/net/ethernet/brocade/bna/bna.h:23:32: note: expanded from macro 'bna_is_small_rxq'
#define bna_is_small_rxq(_id) ((_id) & 0x1)
^~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:270:2: note: Taking true branch
if (bna_is_small_rxq(rcb->id)) {
^
drivers/net/ethernet/brocade/bna/bnad.c:286:20: note: The result of the left shift is undefined due to shifting by '32', which is greater or equal to the width of type 'unsigned long'
BUG_ON((PAGE_SIZE << order) % unmap_q->map_size);
^
include/asm-generic/bug.h:63:45: note: expanded from macro 'BUG_ON'
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
^~~~~~~~~
include/linux/compiler.h:48:41: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^
include/linux/compiler.h:33:34: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
>> drivers/net/ethernet/brocade/bna/bnad.c:286:30: warning: Division by zero [clang-analyzer-core.DivideZero]
BUG_ON((PAGE_SIZE << order) % unmap_q->map_size);
^
drivers/net/ethernet/brocade/bna/bnad.c:1240:2: note: Loop condition is true. Entering loop body
for (i = 0; i < BNAD_MAX_RXP_PER_RX; i++) {
^
drivers/net/ethernet/brocade/bna/bnad.c:1243:7: note: Assuming 'ccb' is non-null
if (!ccb)
^~~~
drivers/net/ethernet/brocade/bna/bnad.c:1243:3: note: Taking false branch
if (!ccb)
^
drivers/net/ethernet/brocade/bna/bnad.c:1248:3: note: Loop condition is true. Entering loop body
for (j = 0; j < BNAD_MAX_RXQ_PER_RXP; j++) {
^
drivers/net/ethernet/brocade/bna/bnad.c:1250:8: note: Assuming 'rcb' is non-null
if (!rcb)
^~~~
drivers/net/ethernet/brocade/bna/bnad.c:1250:4: note: Taking false branch
if (!rcb)
^
drivers/net/ethernet/brocade/bna/bnad.c:1253:4: note: Calling 'bnad_rxq_alloc_init'
bnad_rxq_alloc_init(bnad, rcb);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:270:6: note: Assuming the condition is false
if (bna_is_small_rxq(rcb->id)) {
^
drivers/net/ethernet/brocade/bna/bna.h:23:32: note: expanded from macro 'bna_is_small_rxq'
#define bna_is_small_rxq(_id) ((_id) & 0x1)
^~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:270:2: note: Taking false branch
if (bna_is_small_rxq(rcb->id)) {
^
drivers/net/ethernet/brocade/bna/bnad.c:274:7: note: Assuming field 'multi_buffer' is 0
if (rcb->rxq->multi_buffer) {
^~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:274:3: note: Taking false branch
if (rcb->rxq->multi_buffer) {
^
drivers/net/ethernet/brocade/bna/bnad.c:281:6: note: Assuming field 'buffer_size' is > 2048
(rcb->rxq->buffer_size > 2048) ?
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:281:5: note: '?' condition is true
(rcb->rxq->buffer_size > 2048) ?
^
drivers/net/ethernet/brocade/bna/bnad.c:280:4: note: The value 0 is assigned to field 'map_size'
unmap_q->map_size =
^~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/brocade/bna/bnad.c:286:30: note: Division by zero
BUG_ON((PAGE_SIZE << order) % unmap_q->map_size);
^
include/asm-generic/bug.h:63:45: note: expanded from macro 'BUG_ON'
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
~~~~~~~~~^~~~~~~~~~
include/linux/compiler.h:48:41: note: expanded from macro 'unlikely'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:33:34: note: expanded from macro '__branch_check__'
______r = __builtin_expect(!!(x), expect); \
^
drivers/net/ethernet/brocade/bna/bnad.c:396:3: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
BNA_SET_DMA_ADDR(dma_addr, &rxent->host_addr);
^
drivers/net/ethernet/brocade/bna/bna.h:34:23: note: expanded from macro 'BNA_SET_DMA_ADDR'
(_bna_dma_addr)->lsb = ((struct bna_dma_addr *)&tmp_addr)->lsb; \
^
drivers/net/ethernet/brocade/bna/bnad.c:1860:3: note: Left side of '&&' is false
container_of(napi, struct bnad_rx_ctrl, napi);
^
include/linux/kernel.h:694:61: note: expanded from macro 'container_of'
BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
^
drivers/net/ethernet/brocade/bna/bnad.c:1860:3: note: Taking false branch
container_of(napi, struct bnad_rx_ctrl, napi);
^
include/linux/kernel.h:694:2: 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:315:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:303:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:295:3: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^
drivers/net/ethernet/brocade/bna/bnad.c:1860:3: note: Loop condition is false. Exiting loop
container_of(napi, struct bnad_rx_ctrl, napi);
^
include/linux/kernel.h:694:2: 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:315:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
vim +29 drivers/pci/endpoint/pci-epc-mem.c
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 14
5e8cb4033807e3 Kishon Vijay Abraham I 2017-04-10 15 /**
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 16 * pci_epc_mem_get_order() - determine the allocation order of a memory size
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 17 * @mem: address space of the endpoint controller
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 18 * @size: the size for which to get the order
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 19 *
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 20 * Reimplement get_order() for mem->page_size since the generic get_order
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 21 * always gets order with a constant PAGE_SIZE.
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 22 */
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 23 static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size)
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 24 {
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 25 int order;
d45e3c1a5979ef Lad Prabhakar 2020-05-07 26 unsigned int page_shift = ilog2(mem->window.page_size);
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 27
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 28 size--;
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 @29 size >>= page_shift;
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 30 #if BITS_PER_LONG == 32
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 31 order = fls(size);
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 32 #else
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 33 order = fls64(size);
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 34 #endif
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 35 return order;
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 36 }
52c9285d47459c Kishon Vijay Abraham I 2017-08-18 37
:::::: The code at line 29 was first introduced by commit
:::::: 52c9285d47459cf241e144c7d8ef15941ba1b181 PCI: endpoint: Add support for configurable page size
:::::: TO: Kishon Vijay Abraham I <kishon@ti.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
next reply other threads:[~2021-12-08 6:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-08 6:12 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-11-30 2:09 drivers/pci/endpoint/pci-epc-mem.c:29:7: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign] kernel test robot
2021-11-28 3:46 kernel test robot
2021-09-19 12:19 kernel test robot
2021-08-23 2:25 kernel test robot
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