* [linux-next:master 10668/10701] include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
@ 2020-05-21 9:30 kbuild test robot
2020-05-21 18:10 ` Andrew Morton
0 siblings, 1 reply; 3+ messages in thread
From: kbuild test robot @ 2020-05-21 9:30 UTC (permalink / raw)
To: Mike Rapoport; +Cc: kbuild-all, Andrew Morton, Linux Memory Management List
[-- Attachment #1: Type: text/plain, Size: 18595 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8
commit: ef03574dee21524cbdbbf2af29fe06a62610570d [10668/10701] mm: introduce include/linux/pgtable.h
config: parisc-randconfig-r011-20200521 (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout ef03574dee21524cbdbbf2af29fe06a62610570d
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>
All warnings (new ones prefixed by >>, old ones prefixed by <<):
In file included from include/linux/pgtable.h:6,
from include/linux/mm.h:95,
from include/linux/pid_namespace.h:7,
from include/linux/ptrace.h:10,
from arch/parisc/kernel/asm-offsets.c:20:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from include/linux/mm.h:95,
from sound/core/pcm_native.c:8:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
sound/core/pcm_native.c: In function 'constrain_mask_params':
sound/core/pcm_native.c:254:18: warning: variable 'old_mask' set but not used [-Wunused-but-set-variable]
254 | struct snd_mask old_mask;
| ^~~~~~~~
sound/core/pcm_native.c: In function 'constrain_interval_params':
sound/core/pcm_native.c:290:22: warning: variable 'old_interval' set but not used [-Wunused-but-set-variable]
290 | struct snd_interval old_interval;
| ^~~~~~~~~~~~
sound/core/pcm_native.c: In function 'constrain_params_by_rules':
sound/core/pcm_native.c:331:22: warning: variable 'old_interval' set but not used [-Wunused-but-set-variable]
331 | struct snd_interval old_interval;
| ^~~~~~~~~~~~
sound/core/pcm_native.c:330:18: warning: variable 'old_mask' set but not used [-Wunused-but-set-variable]
330 | struct snd_mask old_mask;
| ^~~~~~~~
sound/core/pcm_native.c: In function 'snd_pcm_hw_params_choose':
sound/core/pcm_native.c:615:22: warning: variable 'old_interval' set but not used [-Wunused-but-set-variable]
615 | struct snd_interval old_interval;
| ^~~~~~~~~~~~
sound/core/pcm_native.c:614:18: warning: variable 'old_mask' set but not used [-Wunused-but-set-variable]
614 | struct snd_mask old_mask;
| ^~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/irq.h:20,
from include/linux/gpio/driver.h:7,
from include/linux/of_gpio.h:14,
from sound/soc/codecs/ak4118.c:12:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/ak4118.c:407:34: warning: 'ak4118_of_match' defined but not used [-Wunused-const-variable=]
407 | static const struct of_device_id ak4118_of_match[] = {
| ^~~~~~~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/irq.h:20,
from include/linux/gpio/driver.h:7,
from include/linux/of_gpio.h:14,
from sound/soc/codecs/ak4458.c:13:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
sound/soc/codecs/ak4458.c: In function 'ak4458_set_dai_mute':
sound/soc/codecs/ak4458.c:408:16: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
408 | int nfs, ndt, ret, reg;
| ^~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/iopoll.h:14,
from include/linux/regmap.h:20,
from sound/soc/codecs/ak5558.c:13:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/ak5558.c:388:34: warning: 'ak5558_i2c_dt_ids' defined but not used [-Wunused-const-variable=]
388 | static const struct of_device_id ak5558_i2c_dt_ids[] = {
| ^~~~~~~~~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/iopoll.h:14,
from include/linux/regmap.h:20,
from sound/soc/codecs/alc5623.c:19:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/alc5623.c:1070:34: warning: 'alc5623_of_match' defined but not used [-Wunused-const-variable=]
1070 | static const struct of_device_id alc5623_of_match[] = {
| ^~~~~~~~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/irq.h:20,
from include/linux/gpio/driver.h:7,
from include/asm-generic/gpio.h:11,
from include/linux/gpio.h:62,
from sound/soc/codecs/cs42l42.c:19:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
sound/soc/codecs/cs42l42.c: In function 'cs42l42_handle_device_data':
sound/soc/codecs/cs42l42.c:1661:12: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
1661 | if ((val >= CS42L42_BTN_DET_INIT_DBNCE_MIN) &&
| ^~
sound/soc/codecs/cs42l42.c:1679:12: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
1679 | if ((val >= CS42L42_BTN_DET_EVENT_DBNCE_MIN) &&
| ^~
sound/soc/codecs/cs42l42.c:1698:23: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
1698 | if ((thresholds[i] >= CS42L42_HS_DET_LEVEL_MIN) &&
| ^~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/irq.h:20,
from arch/parisc/include/asm/hardirq.h:13,
from include/linux/hardirq.h:9,
from include/linux/interrupt.h:11,
from include/sound/soc.h:18,
from sound/soc/codecs/es7134.c:9:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/es7134.c:264:33: warning: 'es7154_chip' defined but not used [-Wunused-const-variable=]
264 | static const struct es7134_chip es7154_chip = {
| ^~~~~~~~~~~
sound/soc/codecs/es7134.c:186:33: warning: 'es7134_chip' defined but not used [-Wunused-const-variable=]
186 | static const struct es7134_chip es7134_chip = {
| ^~~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/iopoll.h:14,
from include/linux/regmap.h:20,
from sound/soc/codecs/es8316.c:17:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/es8316.c:842:36: warning: 'es8316_acpi_match' defined but not used [-Wunused-const-variable=]
842 | static const struct acpi_device_id es8316_acpi_match[] = {
| ^~~~~~~~~~~~~~~~~
sound/soc/codecs/es8316.c:836:34: warning: 'es8316_of_match' defined but not used [-Wunused-const-variable=]
836 | static const struct of_device_id es8316_of_match[] = {
| ^~~~~~~~~~~~~~~
--
In file included from include/linux/pgtable.h:6,
from arch/parisc/include/asm/io.h:6,
from include/linux/io.h:13,
from include/linux/iopoll.h:14,
from include/linux/regmap.h:20,
from sound/soc/codecs/pcm1789-i2c.c:11:
include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
| ^~~~~~~~~~
>> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
203 | pte_clear(mm, address, ptep);
| ^~~~~~~~~
include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
>> include/linux/pgtable.h:646:2: note: in expansion of macro 'set_pte_at'
646 | set_pte_at(vma->vm_mm, addr, ptep, pte);
| ^~~~~~~~~~
At top level:
sound/soc/codecs/pcm1789-i2c.c:36:34: warning: 'pcm1789_of_match' defined but not used [-Wunused-const-variable=]
36 | static const struct of_device_id pcm1789_of_match[] = {
| ^~~~~~~~~~~~~~~~
..
vim +/pte_clear +203 include/linux/pgtable.h
a600388d284193 include/asm-generic/pgtable.h Zachary Amsden 2005-09-03 191
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 192 /*
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 193 * Some architectures may be able to avoid expensive synchronization
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 194 * primitives when modifications are made to PTE's which are already
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 195 * not present, or in the process of an address space destruction.
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 196 */
9888a1cae3f859 include/asm-generic/pgtable.h Zachary Amsden 2006-09-30 197 #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 198 static inline void pte_clear_not_present_full(struct mm_struct *mm,
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 199 unsigned long address,
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 200 pte_t *ptep,
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 201 int full)
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 202 {
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 @203 pte_clear(mm, address, ptep);
e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13 204 }
a600388d284193 include/asm-generic/pgtable.h Zachary Amsden 2005-09-03 205 #endif
a600388d284193 include/asm-generic/pgtable.h Zachary Amsden 2005-09-03 206
:::::: The code at line 203 was first introduced by commit
:::::: e2cda322648122dc400c85ada80eaddbc612ef6a thp: add pmd mangling generic functions
:::::: TO: Andrea Arcangeli <aarcange@redhat.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 33603 bytes --]
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [linux-next:master 10668/10701] include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
2020-05-21 9:30 [linux-next:master 10668/10701] include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear' kbuild test robot
@ 2020-05-21 18:10 ` Andrew Morton
2020-05-21 18:58 ` Mike Rapoport
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Morton @ 2020-05-21 18:10 UTC (permalink / raw)
To: kbuild test robot
Cc: Mike Rapoport, kbuild-all, Linux Memory Management List,
James E.J. Bottomley, Helge Deller, linux-parisc
On Thu, 21 May 2020 17:30:52 +0800 kbuild test robot <lkp@intel.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8
> commit: ef03574dee21524cbdbbf2af29fe06a62610570d [10668/10701] mm: introduce include/linux/pgtable.h
> config: parisc-randconfig-r011-20200521 (attached as .config)
> compiler: hppa-linux-gcc (GCC) 9.3.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> git checkout ef03574dee21524cbdbbf2af29fe06a62610570d
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
> In file included from include/linux/pgtable.h:6,
> from include/linux/mm.h:95,
> from include/linux/pid_namespace.h:7,
> from include/linux/ptrace.h:10,
> from arch/parisc/kernel/asm-offsets.c:20:
> include/linux/pgtable.h: In function 'pte_clear_not_present_full':
> arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
> 96 | pte_t old_pte; | ^~~~~~~
> arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
> 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
> | ^~~~~~~~~~
> >> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
> 203 | pte_clear(mm, address, ptep);
> | ^~~~~~~~~
> include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
> arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
I can't reproduce this. And I can't see anything in -mm whcih would
have triggered this warning.
arch/parisc/include/asm/pgtable.h has
#define set_pte_at(mm, addr, ptep, pteval) \
do { \
pte_t old_pte; \
unsigned long flags; \
spin_lock_irqsave(pgd_spinlock((mm)->pgd), flags);\
old_pte = *ptep; \
set_pte(ptep, pteval); \
purge_tlb_entries(mm, addr); \
spin_unlock_irqrestore(pgd_spinlock((mm)->pgd), flags);\
} while (0)
and old_pte has been set-but-not-used for a long time.
Obviously we can fix it, but I'm worried that parisc's set_pte_at() was
previously unused and we've now done something to cause it to be used,
so we're now running previously untested code.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [linux-next:master 10668/10701] include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
2020-05-21 18:10 ` Andrew Morton
@ 2020-05-21 18:58 ` Mike Rapoport
0 siblings, 0 replies; 3+ messages in thread
From: Mike Rapoport @ 2020-05-21 18:58 UTC (permalink / raw)
To: Andrew Morton
Cc: kbuild test robot, kbuild-all, Linux Memory Management List,
James E.J. Bottomley, Helge Deller, linux-parisc
On Thu, May 21, 2020 at 11:10:13AM -0700, Andrew Morton wrote:
> On Thu, 21 May 2020 17:30:52 +0800 kbuild test robot <lkp@intel.com> wrote:
>
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8
> > commit: ef03574dee21524cbdbbf2af29fe06a62610570d [10668/10701] mm: introduce include/linux/pgtable.h
> > config: parisc-randconfig-r011-20200521 (attached as .config)
> > compiler: hppa-linux-gcc (GCC) 9.3.0
> > reproduce:
> > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > chmod +x ~/bin/make.cross
> > git checkout ef03574dee21524cbdbbf2af29fe06a62610570d
> > # save the attached .config to linux build tree
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kbuild test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> >
> > In file included from include/linux/pgtable.h:6,
> > from include/linux/mm.h:95,
> > from include/linux/pid_namespace.h:7,
> > from include/linux/ptrace.h:10,
> > from arch/parisc/kernel/asm-offsets.c:20:
> > include/linux/pgtable.h: In function 'pte_clear_not_present_full':
> > arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
> > 96 | pte_t old_pte; | ^~~~~~~
> > arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
> > 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
> > | ^~~~~~~~~~
> > >> include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear'
> > 203 | pte_clear(mm, address, ptep);
> > | ^~~~~~~~~
> > include/linux/pgtable.h: In function '__ptep_modify_prot_commit':
> > arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
>
> I can't reproduce this. And I can't see anything in -mm whcih would
> have triggered this warning.
>
> arch/parisc/include/asm/pgtable.h has
>
> #define set_pte_at(mm, addr, ptep, pteval) \
> do { \
> pte_t old_pte; \
> unsigned long flags; \
> spin_lock_irqsave(pgd_spinlock((mm)->pgd), flags);\
> old_pte = *ptep; \
> set_pte(ptep, pteval); \
> purge_tlb_entries(mm, addr); \
> spin_unlock_irqrestore(pgd_spinlock((mm)->pgd), flags);\
> } while (0)
>
> and old_pte has been set-but-not-used for a long time.
>
> Obviously we can fix it, but I'm worried that parisc's set_pte_at() was
> previously unused and we've now done something to cause it to be used,
> so we're now running previously untested code.
I can reporduce it with
make W=1 ARCH=parisc CROSS_COMPILE=/opt/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-
on both the v5.7-rc6 and linux-next.
The only difference in the header names:
--- build-master.log 2020-05-21 21:44:03.064168815 +0300
+++ build-next.log 2020-05-21 21:44:52.372330747 +0300
@@ -2,25 +2,26 @@
GEN Makefile
CALL scripts/atomic/check-atomics.sh
CC arch/parisc/kernel/asm-offsets.s
-In file included from include/linux/mm.h:95,
+In file included from include/linux/pgtable.h:6,
+ from include/linux/mm.h:31,
from include/linux/pid_namespace.h:7,
from include/linux/ptrace.h:10,
from arch/parisc/kernel/asm-offsets.c:20:
-include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full':
+include/linux/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
pte_t old_pte; \
^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
#define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
^~~~~~~~~~
...
I think moving asm-generic/pgtable.h to linux/pgtable.h triggered the
"new warning" notification.
And the fix is obviously:
From 6de5f02d11fef8894836168c3e7bede05916d02d Mon Sep 17 00:00:00 2001
From: Mike Rapoport <rppt@linux.ibm.com>
Date: Thu, 21 May 2020 21:49:01 +0300
Subject: [PATCH] parisc: set_pte_at: remove unused old_pte variable.
kbuild test robot complains about unused variable old_pte in set_pte_at()
macro:
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 | pte_t old_pte; | ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
Remove the old_pte variable.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
arch/parisc/include/asm/pgtable.h | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index 097d19007f2e..75cf84070fc9 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -93,10 +93,8 @@ static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
#define set_pte_at(mm, addr, ptep, pteval) \
do { \
- pte_t old_pte; \
unsigned long flags; \
spin_lock_irqsave(pgd_spinlock((mm)->pgd), flags);\
- old_pte = *ptep; \
set_pte(ptep, pteval); \
purge_tlb_entries(mm, addr); \
spin_unlock_irqrestore(pgd_spinlock((mm)->pgd), flags);\
--
2.26.2
--
Sincerely yours,
Mike.
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2020-05-21 9:30 [linux-next:master 10668/10701] include/linux/pgtable.h:203:2: note: in expansion of macro 'pte_clear' kbuild test robot
2020-05-21 18:10 ` Andrew Morton
2020-05-21 18:58 ` Mike Rapoport
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