* [ammarfaizi2-block:next/linux-next/master 378/379] mm/sparse-vmemmap.c:747:17: warning: Value stored to 'next' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-02-26 4:24 kernel test robot
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From: kernel test robot @ 2022-02-26 4:24 UTC (permalink / raw)
To: kbuild
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CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: "GNU/Weeb Mailing List" <gwml@vger.gnuweeb.org>
CC: linux-kernel(a)vger.kernel.org
TO: Mark Brown <broonie@kernel.org>
tree: https://github.com/ammarfaizi2/linux-block next/linux-next/master
head: 44948bd49d878dad6c9707e34f4a06df73c3a800
commit: 15aa3a056caa5192fe614cacebf054634b4c5e90 [378/379] Fix up more mismerges
:::::: branch date: 26 hours ago
:::::: commit date: 27 hours ago
config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220226/202202261206.iayFIHUI-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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
# https://github.com/ammarfaizi2/linux-block/commit/15aa3a056caa5192fe614cacebf054634b4c5e90
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block next/linux-next/master
git checkout 15aa3a056caa5192fe614cacebf054634b4c5e90
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>)
drivers/pinctrl/intel/pinctrl-intel.c:1777:15: note: Value stored to 'n' during its initialization is never read
unsigned int n = reg / sizeof(u32);
^ ~~~~~~~~~~~~~~~~~
drivers/pinctrl/intel/pinctrl-intel.c:1778:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct device *dev = pctrl->dev;
^~~ ~~~~~~~~~~
drivers/pinctrl/intel/pinctrl-intel.c:1778:17: note: Value stored to 'dev' during its initialization is never read
struct device *dev = pctrl->dev;
^~~ ~~~~~~~~~~
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
7 warnings generated.
drivers/hwmon/f71882fg.c:1801:4: warning: Division by zero [clang-analyzer-core.DivideZero]
/ fan_from_reg(data->fan_full_speed[nr]);
~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hwmon/f71882fg.c:1795:6: note: Assuming the condition is false
if (data->pwm_enable & (1 << (2 * nr)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hwmon/f71882fg.c:1795:2: note: Taking false branch
if (data->pwm_enable & (1 << (2 * nr)))
^
drivers/hwmon/f71882fg.c:1801:6: note: Calling 'fan_from_reg'
/ fan_from_reg(data->fan_full_speed[nr]);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hwmon/f71882fg.c:1148:9: note: Assuming 'reg' is 0
return reg ? (1500000 / reg) : 0;
^~~
drivers/hwmon/f71882fg.c:1148:9: note: '?' condition is false
drivers/hwmon/f71882fg.c:1148:2: note: Returning zero
return reg ? (1500000 / reg) : 0;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hwmon/f71882fg.c:1801:6: note: Returning from 'fan_from_reg'
/ fan_from_reg(data->fan_full_speed[nr]);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hwmon/f71882fg.c:1801:4: note: Division by zero
/ fan_from_reg(data->fan_full_speed[nr]);
~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
7 warnings generated.
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.
7 warnings generated.
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.
mm/swap_state.c:165:9: warning: Value stored to 'entry' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
void *entry = xas_store(&xas, shadow);
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~
mm/swap_state.c:165:9: note: Value stored to 'entry' during its initialization is never read
void *entry = xas_store(&xas, shadow);
^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~
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.
9 warnings generated.
mm/swapfile.c:533:28: warning: Value stored to 'ci' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct swap_cluster_info *ci = si->cluster_info + idx;
^~ ~~~~~~~~~~~~~~~~~~~~~~
mm/swapfile.c:533:28: note: Value stored to 'ci' during its initialization is never read
struct swap_cluster_info *ci = si->cluster_info + idx;
^~ ~~~~~~~~~~~~~~~~~~~~~~
mm/swapfile.c:1312:2: warning: Value stored to 'count' is never read [clang-analyzer-deadcode.DeadStores]
count = p->swap_map[offset];
^ ~~~~~~~~~~~~~~~~~~~
mm/swapfile.c:1312:2: note: Value stored to 'count' is never read
count = p->swap_map[offset];
^ ~~~~~~~~~~~~~~~~~~~
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.
6 warnings generated.
Suppressed 6 warnings (6 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.
6 warnings generated.
Suppressed 6 warnings (6 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.
7 warnings generated.
Suppressed 7 warnings (6 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.
6 warnings generated.
>> mm/sparse-vmemmap.c:747:17: warning: Value stored to 'next' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned long next = addr, last = addr + size;
^~~~ ~~~~
mm/sparse-vmemmap.c:747:17: note: Value stored to 'next' during its initialization is never read
unsigned long next = addr, last = addr + size;
^~~~ ~~~~
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.
5 warnings generated.
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.
5 warnings generated.
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.
14 warnings generated.
drivers/block/aoe/aoecmd.c:152:13: warning: Although the value stored to 'lba' is used in the enclosing expression, the value is never actually read from 'lba' [clang-analyzer-deadcode.DeadStores]
ah->lba5 = lba >>= 8;
^ ~
drivers/block/aoe/aoecmd.c:152:13: note: Although the value stored to 'lba' is used in the enclosing expression, the value is never actually read from 'lba'
ah->lba5 = lba >>= 8;
^ ~
Suppressed 13 warnings (13 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.
Suppressed 13 warnings (13 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.
13 warnings generated.
Suppressed 13 warnings (13 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.
7 warnings generated.
arch/x86/include/asm/paravirt.h:55:2: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
PVOP_VCALL0(cpu.io_delay);
^
arch/x86/include/asm/paravirt_types.h:512:2: note: expanded from macro 'PVOP_VCALL0'
__PVOP_VCALL(op)
^
arch/x86/include/asm/paravirt_types.h:492:8: note: expanded from macro '__PVOP_VCALL'
(void)____PVOP_CALL(, op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
^
arch/x86/include/asm/paravirt_types.h:447:3: note: expanded from macro '____PVOP_CALL'
PVOP_CALL_ARGS; \
^
arch/x86/include/asm/paravirt_types.h:405:16: note: expanded from macro 'PVOP_CALL_ARGS'
unsigned long __edi = __edi, __esi = __esi, \
^
drivers/usb/host/pci-quirks.c:509:2: note: Calling 'usb_amd_quirk_pll'
usb_amd_quirk_pll(0);
^~~~~~~~~~~~~~~~~~~~
drivers/usb/host/pci-quirks.c:343:12: note: 'disable' is 0
u32 bit = disable ? 0 : 1;
^~~~~~~
drivers/usb/host/pci-quirks.c:343:12: note: '?' condition is false
drivers/usb/host/pci-quirks.c:346:2: note: Loop condition is false. Exiting loop
spin_lock_irqsave(&amd_lock, flags);
^
include/linux/spinlock.h:384:2: note: expanded from macro 'spin_lock_irqsave'
raw_spin_lock_irqsave(spinlock_check(lock), flags); \
^
include/linux/spinlock.h:240:2: note: expanded from macro 'raw_spin_lock_irqsave'
do { \
^
drivers/usb/host/pci-quirks.c:346:2: note: Loop condition is false. Exiting loop
spin_lock_irqsave(&amd_lock, flags);
^
include/linux/spinlock.h:382:43: note: expanded from macro 'spin_lock_irqsave'
#define spin_lock_irqsave(lock, flags) \
^
drivers/usb/host/pci-quirks.c:348:6: note: 'disable' is 0
if (disable) {
^~~~~~~
drivers/usb/host/pci-quirks.c:348:2: note: Taking false branch
if (disable) {
^
drivers/usb/host/pci-quirks.c:356:7: note: Assuming field 'isoc_reqs' is <= 0
if (amd_chipset.isoc_reqs > 0) {
^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/usb/host/pci-quirks.c:356:3: note: Taking false branch
if (amd_chipset.isoc_reqs > 0) {
^
drivers/usb/host/pci-quirks.c:362:6: note: Assuming field 'gen' is equal to AMD_CHIPSET_SB800
if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB800 ||
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/usb/host/pci-quirks.c:362:51: note: Left side of '||' is true
if (amd_chipset.sb_type.gen == AMD_CHIPSET_SB800 ||
^
drivers/usb/host/pci-quirks.c:365:3: note: Calling 'outb_p'
outb_p(AB_REG_BAR_LOW, 0xcd6);
^
arch/x86/include/asm/io.h:337:16: note: expanded from macro 'outb_p'
#define outb_p outb_p
^
arch/x86/include/asm/io.h:320:1: note: Calling 'slow_down_io'
BUILDIO(b, b, char)
^
arch/x86/include/asm/io.h:278:2: note: expanded from macro 'BUILDIO'
slow_down_io(); \
^~~~~~~~~~~~~~
arch/x86/include/asm/paravirt.h:55:2: note: Assigned value is garbage or undefined
vim +/next +747 mm/sparse-vmemmap.c
69543e15fc8fb75 Joao Martins 2022-02-24 723
69543e15fc8fb75 Joao Martins 2022-02-24 724 static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,
69543e15fc8fb75 Joao Martins 2022-02-24 725 unsigned long start,
69543e15fc8fb75 Joao Martins 2022-02-24 726 unsigned long end, int node,
69543e15fc8fb75 Joao Martins 2022-02-24 727 struct dev_pagemap *pgmap)
69543e15fc8fb75 Joao Martins 2022-02-24 728 {
69543e15fc8fb75 Joao Martins 2022-02-24 729 unsigned long size, addr;
69543e15fc8fb75 Joao Martins 2022-02-24 730 pte_t *pte;
69543e15fc8fb75 Joao Martins 2022-02-24 731 int rc;
69543e15fc8fb75 Joao Martins 2022-02-24 732
69543e15fc8fb75 Joao Martins 2022-02-24 733 if (reuse_compound_section(start_pfn, pgmap)) {
69543e15fc8fb75 Joao Martins 2022-02-24 734 pte = compound_section_tail_page(start);
4076bbc93eda6e1 Joao Martins 2022-02-24 735 if (!pte)
4076bbc93eda6e1 Joao Martins 2022-02-24 736 return -ENOMEM;
69543e15fc8fb75 Joao Martins 2022-02-24 737
69543e15fc8fb75 Joao Martins 2022-02-24 738 /*
69543e15fc8fb75 Joao Martins 2022-02-24 739 * Reuse the page that was populated in the prior iteration
69543e15fc8fb75 Joao Martins 2022-02-24 740 * with just tail struct pages.
69543e15fc8fb75 Joao Martins 2022-02-24 741 */
69543e15fc8fb75 Joao Martins 2022-02-24 742 return vmemmap_populate_range(start, end, node, pte_page(*pte));
69543e15fc8fb75 Joao Martins 2022-02-24 743 }
69543e15fc8fb75 Joao Martins 2022-02-24 744
69543e15fc8fb75 Joao Martins 2022-02-24 745 size = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));
69543e15fc8fb75 Joao Martins 2022-02-24 746 for (addr = start; addr < end; addr += size) {
69543e15fc8fb75 Joao Martins 2022-02-24 @747 unsigned long next = addr, last = addr + size;
69543e15fc8fb75 Joao Martins 2022-02-24 748
69543e15fc8fb75 Joao Martins 2022-02-24 749 /* Populate the head page vmemmap page */
69543e15fc8fb75 Joao Martins 2022-02-24 750 pte = vmemmap_populate_address(addr, node, NULL, NULL);
69543e15fc8fb75 Joao Martins 2022-02-24 751 if (!pte)
69543e15fc8fb75 Joao Martins 2022-02-24 752 return -ENOMEM;
69543e15fc8fb75 Joao Martins 2022-02-24 753
69543e15fc8fb75 Joao Martins 2022-02-24 754 /* Populate the tail pages vmemmap page */
69543e15fc8fb75 Joao Martins 2022-02-24 755 next = addr + PAGE_SIZE;
69543e15fc8fb75 Joao Martins 2022-02-24 756 pte = vmemmap_populate_address(next, node, NULL, NULL);
69543e15fc8fb75 Joao Martins 2022-02-24 757 if (!pte)
69543e15fc8fb75 Joao Martins 2022-02-24 758 return -ENOMEM;
69543e15fc8fb75 Joao Martins 2022-02-24 759
69543e15fc8fb75 Joao Martins 2022-02-24 760 /*
69543e15fc8fb75 Joao Martins 2022-02-24 761 * Reuse the previous page for the rest of tail pages
69543e15fc8fb75 Joao Martins 2022-02-24 762 * See layout diagram in Documentation/vm/vmemmap_dedup.rst
69543e15fc8fb75 Joao Martins 2022-02-24 763 */
69543e15fc8fb75 Joao Martins 2022-02-24 764 next += PAGE_SIZE;
69543e15fc8fb75 Joao Martins 2022-02-24 765 rc = vmemmap_populate_range(next, last, node, pte_page(*pte));
69543e15fc8fb75 Joao Martins 2022-02-24 766 if (rc)
69543e15fc8fb75 Joao Martins 2022-02-24 767 return -ENOMEM;
8f6aac419bd590f Christoph Lameter 2007-10-16 768 }
29c71111d055738 Andy Whitcroft 2007-10-16 769
29c71111d055738 Andy Whitcroft 2007-10-16 770 return 0;
8f6aac419bd590f Christoph Lameter 2007-10-16 771 }
8f6aac419bd590f Christoph Lameter 2007-10-16 772
:::::: The code@line 747 was first introduced by commit
:::::: 69543e15fc8fb75dac97bd88442acbcd8d016704 mm/sparse-vmemmap: improve memory savings for compound devmaps
:::::: TO: Joao Martins <joao.m.martins@oracle.com>
:::::: CC: Mark Brown <broonie@kernel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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2022-02-26 4:24 [ammarfaizi2-block:next/linux-next/master 378/379] mm/sparse-vmemmap.c:747:17: warning: Value stored to 'next' during its initialization is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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