* drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-01-17 10:00 ` kernel test robot
0 siblings, 0 replies; 12+ messages in thread
From: kernel test robot @ 2022-01-17 10:00 UTC (permalink / raw)
To: Oleksij Rempel
Cc: llvm, kbuild-all, linux-kernel, Jonathan Cameron, Andy Shevchenko
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0c947b893d69231a9add855939da7c66237ab44f
commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
date: 8 months ago
config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
^~~~~~~~~
include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
^~~~
include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
^~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~
include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^~~~~~~~~
include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^~~~~~~~~
include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^~~~~~~~~
1 warning generated.
vim +242 drivers/iio/adc/ti-tsc2046.c
239
240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
241 {
> 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
243 }
244
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
^ permalink raw reply [flat|nested] 12+ messages in thread
* drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-01-17 10:00 ` kernel test robot
0 siblings, 0 replies; 12+ messages in thread
From: kernel test robot @ 2022-01-17 10:00 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 3517 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0c947b893d69231a9add855939da7c66237ab44f
commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
date: 8 months ago
config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp(a)intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
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 mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
^~~~~~~~~
include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
^~~~
include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
^~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~
include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^~~~~~~~~
include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^~~~~~~~~
include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^~~~~~~~~
1 warning generated.
vim +242 drivers/iio/adc/ti-tsc2046.c
239
240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
241 {
> 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
243 }
244
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
2022-01-17 10:00 ` kernel test robot
@ 2022-01-17 10:19 ` Jonathan Cameron
-1 siblings, 0 replies; 12+ messages in thread
From: Jonathan Cameron @ 2022-01-17 10:19 UTC (permalink / raw)
To: kernel test robot
Cc: Oleksij Rempel, llvm, kbuild-all, linux-kernel, Andy Shevchenko
On Mon, 17 Jan 2022 18:00:03 +0800
kernel test robot <lkp@intel.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 0c947b893d69231a9add855939da7c66237ab44f
> commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> date: 8 months ago
> config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp@intel.com/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
> 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 mips cross compiling tool for clang build
> # apt-get install binutils-mips-linux-gnu
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> # save the config file to linux build tree
> mkdir build_dir
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
I'm open to suggestions on what (if anything) to do about this one...
Jonathan
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert'
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^~~~~~~~~
> include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert'
> __compiletime_assert(condition, msg, prefix, suffix)
> ^~~~~~~~~
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> 1 warning generated.
>
>
> vim +242 drivers/iio/adc/ti-tsc2046.c
>
> 239
> 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> 241 {
> > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> 243 }
> 244
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-01-17 10:19 ` Jonathan Cameron
0 siblings, 0 replies; 12+ messages in thread
From: Jonathan Cameron @ 2022-01-17 10:19 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 3810 bytes --]
On Mon, 17 Jan 2022 18:00:03 +0800
kernel test robot <lkp@intel.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 0c947b893d69231a9add855939da7c66237ab44f
> commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> date: 8 months ago
> config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp(a)intel.com/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
> 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 mips cross compiling tool for clang build
> # apt-get install binutils-mips-linux-gnu
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> # save the config file to linux build tree
> mkdir build_dir
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
I'm open to suggestions on what (if anything) to do about this one...
Jonathan
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert'
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^~~~~~~~~
> include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert'
> __compiletime_assert(condition, msg, prefix, suffix)
> ^~~~~~~~~
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> 1 warning generated.
>
>
> vim +242 drivers/iio/adc/ti-tsc2046.c
>
> 239
> 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> 241 {
> > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> 243 }
> 244
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
2022-01-17 10:19 ` Jonathan Cameron
(?)
@ 2022-01-17 17:14 ` Andy Shevchenko
-1 siblings, 0 replies; 12+ messages in thread
From: Andy Shevchenko @ 2022-01-17 17:14 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 4094 bytes --]
On Monday, January 17, 2022, Jonathan Cameron <Jonathan.Cameron@huawei.com>
wrote:
> On Mon, 17 Jan 2022 18:00:03 +0800
> kernel test robot <lkp@intel.com> wrote:
>
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
> linux.git master
> > head: 0c947b893d69231a9add855939da7c66237ab44f
> > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC
> driver for the TI TSC2046 controller
> > date: 8 months ago
> > config: mips-randconfig-r002-20220116 (https://download.01.org/0day-
> ci/archive/20220117/202201171718.7ZCI4YeQ-lkp(a)intel.com/config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project
> c63a3175c2947e8c1a2d3bbe16a8586600705c54)
> > 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 mips cross compiling tool for clang build
> > # apt-get install binutils-mips-linux-gnu
> > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
> linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > git remote add linus https://git.kernel.org/pub/
> scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > # save the config file to linux build tree
> > mkdir build_dir
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1
> O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of
> packed member 'data' of class or structure 'tsc2046_adc_atom' may result in
> an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT,
> get_unaligned_be16(&buf->data));
> >
> ^~~~~~~~~
>
> I'm open to suggestions on what (if anything) to do about this one...
>
>
Temporary variable?
> Jonathan
>
> > include/linux/bitfield.h:108:27: note: expanded from macro
> 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");
> \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro
> '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,
> \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro
> 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > include/linux/compiler_types.h:328:22: note: expanded from macro
> 'compiletime_assert'
> > _compiletime_assert(condition, msg, __compiletime_assert_,
> __COUNTER__)
> > ^~~~~~~~~
> > include/linux/compiler_types.h:316:23: note: expanded from macro
> '_compiletime_assert'
> > __compiletime_assert(condition, msg, prefix, suffix)
> > ^~~~~~~~~
> > include/linux/compiler_types.h:308:9: note: expanded from macro
> '__compiletime_assert'
> > if (!(condition))
> \
> > ^~~~~~~~~
> > 1 warning generated.
> >
> >
> > vim +242 drivers/iio/adc/ti-tsc2046.c
> >
> > 239
> > 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom
> *buf)
> > 241 {
> > > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT,
> get_unaligned_be16(&buf->data));
> > 243 }
> > 244
> >
> > ---
> > 0-DAY CI Kernel Test Service, Intel Corporation
> > https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
>
>
--
With Best Regards,
Andy Shevchenko
[-- Attachment #2: attachment.htm --]
[-- Type: text/html, Size: 6202 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
2022-01-17 10:19 ` Jonathan Cameron
@ 2022-01-20 21:44 ` Nathan Chancellor
-1 siblings, 0 replies; 12+ messages in thread
From: Nathan Chancellor @ 2022-01-20 21:44 UTC (permalink / raw)
To: Jonathan Cameron
Cc: kernel test robot, Oleksij Rempel, llvm, kbuild-all,
linux-kernel, Andy Shevchenko
On Mon, Jan 17, 2022 at 10:19:41AM +0000, Jonathan Cameron wrote:
> On Mon, 17 Jan 2022 18:00:03 +0800
> kernel test robot <lkp@intel.com> wrote:
>
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 0c947b893d69231a9add855939da7c66237ab44f
> > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> > date: 8 months ago
> > config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp@intel.com/config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
> > 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 mips cross compiling tool for clang build
> > # apt-get install binutils-mips-linux-gnu
> > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > # save the config file to linux build tree
> > mkdir build_dir
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
>
> I'm open to suggestions on what (if anything) to do about this one...
Hi Jonathan,
-Waddress-of-packed-member is disabled in the main Makefile and this
particular randconfig has a bunch of these warnings. It comes from the
fact that arch/mips/loongson64/Platform adds -mno-branch-likely
unconditionally but clang does not support it so it issues a warning:
clang-14: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]
The presence of this warning causes cascading cc-option failures because
cc-option adds -Werror, which means that the requested flag never gets
added to KBUILD_CFLAGS, so we see instances of warnings that should be
disabled.
This has come up in the past because clang has four different ways it
can react to a flag it does not recognize. One is an error, the other
three are warnings. We handle two in scripts/Makefile.clang to try and
make these failures more obvious in the build but we do not handle this
warning because there are instances of it in arch/arm [1]. I'll push to
get that change into mainline so we can avoid this once and for all.
More background:
* 589834b3a009 ("kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS")
* 0664684e1ebd ("kbuild: Add -Werror=ignored-optimization-argument to CLANG_FLAGS")
For now, I have sent [2]. It might be nice to clean the kernel up of
these warnings over time (and I recall seeing a patch fly by recently
[3]) but I don't think there is much for you to do now.
[1]: https://lore.kernel.org/r/20210928154143.2106903-14-arnd@kernel.org/
[2]: https://lore.kernel.org/r/20220120214001.1879469-2-nathan@kernel.org/
[3]: https://lore.kernel.org/r/20220110224656.266536-1-sakari.ailus@linux.intel.com/
Cheers,
Nathan
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-01-20 21:44 ` Nathan Chancellor
0 siblings, 0 replies; 12+ messages in thread
From: Nathan Chancellor @ 2022-01-20 21:44 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 3935 bytes --]
On Mon, Jan 17, 2022 at 10:19:41AM +0000, Jonathan Cameron wrote:
> On Mon, 17 Jan 2022 18:00:03 +0800
> kernel test robot <lkp@intel.com> wrote:
>
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 0c947b893d69231a9add855939da7c66237ab44f
> > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> > date: 8 months ago
> > config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp(a)intel.com/config)
> > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
> > 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 mips cross compiling tool for clang build
> > # apt-get install binutils-mips-linux-gnu
> > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > # save the config file to linux build tree
> > mkdir build_dir
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/iio/adc/ drivers/usb/gadget/
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
>
> I'm open to suggestions on what (if anything) to do about this one...
Hi Jonathan,
-Waddress-of-packed-member is disabled in the main Makefile and this
particular randconfig has a bunch of these warnings. It comes from the
fact that arch/mips/loongson64/Platform adds -mno-branch-likely
unconditionally but clang does not support it so it issues a warning:
clang-14: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]
The presence of this warning causes cascading cc-option failures because
cc-option adds -Werror, which means that the requested flag never gets
added to KBUILD_CFLAGS, so we see instances of warnings that should be
disabled.
This has come up in the past because clang has four different ways it
can react to a flag it does not recognize. One is an error, the other
three are warnings. We handle two in scripts/Makefile.clang to try and
make these failures more obvious in the build but we do not handle this
warning because there are instances of it in arch/arm [1]. I'll push to
get that change into mainline so we can avoid this once and for all.
More background:
* 589834b3a009 ("kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS")
* 0664684e1ebd ("kbuild: Add -Werror=ignored-optimization-argument to CLANG_FLAGS")
For now, I have sent [2]. It might be nice to clean the kernel up of
these warnings over time (and I recall seeing a patch fly by recently
[3]) but I don't think there is much for you to do now.
[1]: https://lore.kernel.org/r/20210928154143.2106903-14-arnd(a)kernel.org/
[2]: https://lore.kernel.org/r/20220120214001.1879469-2-nathan(a)kernel.org/
[3]: https://lore.kernel.org/r/20220110224656.266536-1-sakari.ailus(a)linux.intel.com/
Cheers,
Nathan
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
2022-07-26 8:07 ` Andy Shevchenko
@ 2022-07-26 15:17 ` Nathan Chancellor
-1 siblings, 0 replies; 12+ messages in thread
From: Nathan Chancellor @ 2022-07-26 15:17 UTC (permalink / raw)
To: Andy Shevchenko
Cc: kernel test robot, Nick Desaulniers, Oleksij Rempel, llvm,
kbuild-all, Linux Kernel Mailing List, Jonathan Cameron
On Tue, Jul 26, 2022 at 10:07:09AM +0200, Andy Shevchenko wrote:
> Seems yet another false positive from Clang.
This warning should not show up because it is disabled in the main
Makefile. Unfortunately, a recent change in clang made '-mtune' warn
when it is not supported in the backend, which is the case for ARM:
https://github.com/ClangBuiltLinux/linux/issues/1674
As a result, all subsequent cc-option calls fail, which was the root
cause of this warning last time, just with MIPS:
https://lore.kernel.org/YenXz+RznXBuJMSR@dev-arch.archlinux-ax161/
Intel folks, could you update your version of clang or add this
particular warning to your blocklist? It should be resolved with
https://github.com/llvm/llvm-project/commit/1d23f6c5a4f6ebb101c282f8f506588fe4d9e92f.
Cheers,
Nathan
> On Mon, Jul 25, 2022 at 5:55 AM kernel test robot <lkp@intel.com> wrote:
> >
> > Hi Oleksij,
> >
> > FYI, the error/warning still remains.
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: e0dccc3b76fb35bb257b4118367a883073d7390e
> > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> > date: 1 year, 2 months ago
> > config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp@intel.com/config)
> > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
> > 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=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > # save the config file
> > mkdir build_dir && cp config build_dir/.config
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/
> >
> > If you fix the issue, kindly add following tag where applicable
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
>
> What the heck? The get_unaligned_*() is exactly to get unaligned data.
>
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> > if (!(condition)) \
> > ^~~~~~~~~
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> > if (!(condition)) \
> > ^~~~~~~~~
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
> > (cond) ? \
> > ^~~~
> > 3 warnings generated.
> >
> >
> > vim +242 drivers/iio/adc/ti-tsc2046.c
> >
> > 239
> > 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> > 241 {
> > > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > 243 }
>
>
> --
> With Best Regards,
> Andy Shevchenko
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-07-26 15:17 ` Nathan Chancellor
0 siblings, 0 replies; 12+ messages in thread
From: Nathan Chancellor @ 2022-07-26 15:17 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 8498 bytes --]
On Tue, Jul 26, 2022 at 10:07:09AM +0200, Andy Shevchenko wrote:
> Seems yet another false positive from Clang.
This warning should not show up because it is disabled in the main
Makefile. Unfortunately, a recent change in clang made '-mtune' warn
when it is not supported in the backend, which is the case for ARM:
https://github.com/ClangBuiltLinux/linux/issues/1674
As a result, all subsequent cc-option calls fail, which was the root
cause of this warning last time, just with MIPS:
https://lore.kernel.org/YenXz+RznXBuJMSR(a)dev-arch.archlinux-ax161/
Intel folks, could you update your version of clang or add this
particular warning to your blocklist? It should be resolved with
https://github.com/llvm/llvm-project/commit/1d23f6c5a4f6ebb101c282f8f506588fe4d9e92f.
Cheers,
Nathan
> On Mon, Jul 25, 2022 at 5:55 AM kernel test robot <lkp@intel.com> wrote:
> >
> > Hi Oleksij,
> >
> > FYI, the error/warning still remains.
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: e0dccc3b76fb35bb257b4118367a883073d7390e
> > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> > date: 1 year, 2 months ago
> > config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp(a)intel.com/config)
> > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
> > 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=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> > # save the config file
> > mkdir build_dir && cp config build_dir/.config
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/
> >
> > If you fix the issue, kindly add following tag where applicable
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
>
> What the heck? The get_unaligned_*() is exactly to get unaligned data.
>
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> > if (!(condition)) \
> > ^~~~~~~~~
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> > if (!(condition)) \
> > ^~~~~~~~~
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> > return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > ^~~~~~~~~
> > include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> > __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> > ^~~~
> > include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> > BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> > ^~~~
> > include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~
> > note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> > include/linux/compiler.h:56:47: note: expanded from macro 'if'
> > #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> > ^~~~
> > include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
> > #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> > ^~~~
> > include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
> > (cond) ? \
> > ^~~~
> > 3 warnings generated.
> >
> >
> > vim +242 drivers/iio/adc/ti-tsc2046.c
> >
> > 239
> > 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> > 241 {
> > > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> > 243 }
>
>
> --
> With Best Regards,
> Andy Shevchenko
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
2022-07-25 3:53 kernel test robot
@ 2022-07-26 8:07 ` Andy Shevchenko
0 siblings, 0 replies; 12+ messages in thread
From: Andy Shevchenko @ 2022-07-26 8:07 UTC (permalink / raw)
To: kernel test robot, Nathan Chancellor, Nick Desaulniers
Cc: Oleksij Rempel, llvm, kbuild-all, Linux Kernel Mailing List,
Jonathan Cameron
Seems yet another false positive from Clang.
On Mon, Jul 25, 2022 at 5:55 AM kernel test robot <lkp@intel.com> wrote:
>
> Hi Oleksij,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: e0dccc3b76fb35bb257b4118367a883073d7390e
> commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> date: 1 year, 2 months ago
> config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
> 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=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
What the heck? The get_unaligned_*() is exactly to get unaligned data.
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
> (cond) ? \
> ^~~~
> 3 warnings generated.
>
>
> vim +242 drivers/iio/adc/ti-tsc2046.c
>
> 239
> 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> 241 {
> > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> 243 }
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-07-26 8:07 ` Andy Shevchenko
0 siblings, 0 replies; 12+ messages in thread
From: Andy Shevchenko @ 2022-07-26 8:07 UTC (permalink / raw)
To: kbuild-all
[-- Attachment #1: Type: text/plain, Size: 7504 bytes --]
Seems yet another false positive from Clang.
On Mon, Jul 25, 2022 at 5:55 AM kernel test robot <lkp@intel.com> wrote:
>
> Hi Oleksij,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: e0dccc3b76fb35bb257b4118367a883073d7390e
> commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
> date: 1 year, 2 months ago
> config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp(a)intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
> 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=9374e8f5a38defe90bc65b2decf317c1c62d91dd
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
What the heck? The get_unaligned_*() is exactly to get unaligned data.
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
> if (!(condition)) \
> ^~~~~~~~~
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> >> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
> return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> ^~~~~~~~~
> include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
> __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
> ^~~~
> include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
> BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
> ^~~~
> include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~
> note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler.h:56:47: note: expanded from macro 'if'
> #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
> ^~~~
> include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
> #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
> ^~~~
> include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
> (cond) ? \
> ^~~~
> 3 warnings generated.
>
>
> vim +242 drivers/iio/adc/ti-tsc2046.c
>
> 239
> 240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
> 241 {
> > 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
> 243 }
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 12+ messages in thread
* drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value
@ 2022-07-25 3:53 kernel test robot
2022-07-26 8:07 ` Andy Shevchenko
0 siblings, 1 reply; 12+ messages in thread
From: kernel test robot @ 2022-07-25 3:53 UTC (permalink / raw)
To: Oleksij Rempel
Cc: llvm, kbuild-all, linux-kernel, Jonathan Cameron, Andy Shevchenko
Hi Oleksij,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e0dccc3b76fb35bb257b4118367a883073d7390e
commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
date: 1 year, 2 months ago
config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
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=9374e8f5a38defe90bc65b2decf317c1c62d91dd
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
^~~~~~~~~
include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
^~~~
include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
^~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^~~~~~~~~
include/linux/compiler.h:56:47: note: expanded from macro 'if'
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
^~~~
include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
^~~~
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
^~~~~~~~~
include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
^~~~
include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
^~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^~~~~~~~~
include/linux/compiler.h:56:47: note: expanded from macro 'if'
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
^~~~
include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
^~~~
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
^~~~~~~~~
include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
^~~~
include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \
^~~~
include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler.h:56:47: note: expanded from macro 'if'
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
^~~~
include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
^~~~
include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
(cond) ? \
^~~~
3 warnings generated.
vim +242 drivers/iio/adc/ti-tsc2046.c
239
240 static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
241 {
> 242 return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
243 }
244
--
0-DAY CI Kernel Test Service
https://01.org/lkp
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2022-07-26 15:17 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-01-17 10:00 drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value kernel test robot
2022-01-17 10:00 ` kernel test robot
2022-01-17 10:19 ` Jonathan Cameron
2022-01-17 10:19 ` Jonathan Cameron
2022-01-17 17:14 ` Andy Shevchenko
2022-01-20 21:44 ` Nathan Chancellor
2022-01-20 21:44 ` Nathan Chancellor
2022-07-25 3:53 kernel test robot
2022-07-26 8:07 ` Andy Shevchenko
2022-07-26 8:07 ` Andy Shevchenko
2022-07-26 15:17 ` Nathan Chancellor
2022-07-26 15:17 ` Nathan Chancellor
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