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: Sun, 19 Sep 2021 20:19:25 +0800 [thread overview]
Message-ID: <202109192021.V1Li0KQG-lkp@intel.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 18748 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: d4d016caa4b85b9aa98d7ec8c84e928621a614bc
commit: 2f78788b55baa3410b1ec91a576286abe1ad4d6a ilog2: improve ilog2 for constant arguments
date: 9 months ago
:::::: branch date: 15 hours ago
:::::: commit date: 9 months ago
config: riscv-randconfig-c006-20210916 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8cbbd7e0b2aa21ce7e416cfb63d9965518948c35)
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 riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# 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 attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 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 >>)
^
include/asm-generic/bug.h:104:3: note: expanded from macro 'WARN_ON_ONCE'
__WARN_FLAGS(BUGFLAG_ONCE | \
^
arch/riscv/include/asm/bug.h:79:29: note: expanded from macro '__WARN_FLAGS'
#define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))
^
arch/riscv/include/asm/bug.h:53:32: note: expanded from macro '__BUG_FLAGS'
#define __BUG_FLAGS(flags) \
^
kernel/irq/affinity.c:237:22: note: Division by zero
numvecs * ncpus / remaining_ncpus);
^
include/linux/minmax.h:118:59: note: expanded from macro 'max_t'
#define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
^
include/linux/minmax.h:44:17: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
^
include/linux/minmax.h:38:25: note: expanded from macro '__cmp_once'
typeof(y) unique_y = (y); \
^
Suppressed 11 warnings (4 in non-user code, 7 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.
17 warnings generated.
crypto/sm3_generic.c:121:2: warning: Value stored to 'a' is never read [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:2: note: Value stored to 'a' is never read
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:6: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:6: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:10: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:10: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:14: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:14: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:18: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:18: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:22: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:22: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:26: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:26: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:30: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:30: 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 = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:34: warning: Although the value stored to 'ss1' is used in the enclosing expression, the value is never actually read from 'ss1' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:34: note: Although the value stored to 'ss1' is used in the enclosing expression, the value is never actually read from 'ss1'
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~~~~~~~
crypto/sm3_generic.c:121:40: warning: Although the value stored to 'ss2' is used in the enclosing expression, the value is never actually read from 'ss2' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~
crypto/sm3_generic.c:121:40: note: Although the value stored to 'ss2' is used in the enclosing expression, the value is never actually read from 'ss2'
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~~~~~~~
crypto/sm3_generic.c:121:46: warning: Although the value stored to 'tt1' is used in the enclosing expression, the value is never actually read from 'tt1' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~
crypto/sm3_generic.c:121:46: note: Although the value stored to 'tt1' is used in the enclosing expression, the value is never actually read from 'tt1'
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~~~~~~~
crypto/sm3_generic.c:121:52: warning: Although the value stored to 'tt2' is used in the enclosing expression, the value is never actually read from 'tt2' [clang-analyzer-deadcode.DeadStores]
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~
crypto/sm3_generic.c:121:52: note: Although the value stored to 'tt2' is used in the enclosing expression, the value is never actually read from 'tt2'
a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
^ ~
Suppressed 5 warnings (5 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.
13 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:244:6: note: Assuming '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 false
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 false
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_u64'
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:163:2: note: expanded from macro 'ilog2'
__ilog2_u64(n) \
^~~~~~~~~~~~~~
include/linux/log2.h:32:2: note: Returning the value -1
return fls64(n) - 1;
^~~~~~~~~~~~~~~~~~~
drivers/pci/endpoint/pci-epc-mem.c:26:28: note: Returning from '__ilog2_u64'
unsigned int page_shift = ilog2(mem->window.page_size);
^
include/linux/log2.h:163:2: note: expanded from macro 'ilog2'
__ilog2_u64(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 12 warnings (5 in non-user code, 7 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.
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.
1 warning generated.
lib/math/rational.c:82:35: warning: Division by zero [clang-analyzer-core.DivideZero]
(max_denominator - d0) / d1);
^
include/linux/minmax.h:51:36: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
^
include/linux/minmax.h:44:17: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
^
include/linux/minmax.h:38:25: note: expanded from macro '__cmp_once'
typeof(y) unique_y = (y); \
^
lib/math/rational.c:52:7: note: The value 0 is assigned to 'd1'
n0 = d1 = 0;
^~~~~~
lib/math/rational.c:55:2: note: Loop condition is true. Entering loop body
for (;;) {
^
lib/math/rational.c:58:7: note: Assuming 'd' is not equal to 0
if (d == 0)
^~~~~~
lib/math/rational.c:58:3: note: Taking false branch
if (d == 0)
^
lib/math/rational.c:80:8: note: Assuming 'n2' is > 'max_numerator'
if ((n2 > max_numerator) || (d2 > max_denominator)) {
^~~~~~~~~~~~~~~~~~
lib/math/rational.c:80:28: note: Left side of '||' is true
if ((n2 > max_numerator) || (d2 > max_denominator)) {
^
lib/math/rational.c:82:35: note: Division by zero
(max_denominator - d0) / d1);
^
include/linux/minmax.h:51:36: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
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
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next reply other threads:[~2021-09-19 12:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-19 12:19 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-12-08 6:12 drivers/pci/endpoint/pci-epc-mem.c:29:7: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign] kernel test robot
2021-11-30 2:09 kernel test robot
2021-11-28 3:46 kernel test robot
2021-08-23 2:25 kernel test robot
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