Re: [PATCH] fs: Remove obsolete logic in i_size_read/write

[kernel test robot <lkp@intel.com>]

Hi Alex,

kernel test robot noticed the following build errors:

[auto build test ERROR on brauner-vfs/vfs.all]
[also build test ERROR on linus/master v6.16-rc6 next-20250716]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alex/fs-Remove-obsolete-logic-in-i_size_read-write/20250716-205449
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
patch link:    https://lore.kernel.org/r/20250716125304.1189790-1-alex.fcyrx%40gmail.com
patch subject: [PATCH] fs: Remove obsolete logic in i_size_read/write
config: i386-buildonly-randconfig-001-20250717 (https://download.01.org/0day-ci/archive/20250717/202507171216.eCtc7zAl-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250717/202507171216.eCtc7zAl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507171216.eCtc7zAl-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'i_size_read',
       inlined from 'do_shmat' at ipc/shm.c:1614:9:
>> include/linux/compiler_types.h:568:45: error: call to '__compiletime_assert_451' declared with attribute error: Need native word sized stores/loads for atomicity.
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:549:25: note: in definition of macro '__compiletime_assert'
     549 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:568:9: note: in expansion of macro '_compiletime_assert'
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:571:9: note: in expansion of macro 'compiletime_assert'
     571 |         compiletime_assert(__native_word(t),                            \
         |         ^~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/barrier.h:69:9: note: in expansion of macro 'compiletime_assert_atomic_type'
      69 |         compiletime_assert_atomic_type(*p);                             \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/barrier.h:176:29: note: in expansion of macro '__smp_load_acquire'
     176 | #define smp_load_acquire(p) __smp_load_acquire(p)
         |                             ^~~~~~~~~~~~~~~~~~
   include/linux/fs.h:960:16: note: in expansion of macro 'smp_load_acquire'
     960 |         return smp_load_acquire(&inode->i_size);
         |                ^~~~~~~~~~~~~~~~
   In function 'i_size_read',
       inlined from 'ksys_shmdt' at ipc/shm.c:1783:11:
>> include/linux/compiler_types.h:568:45: error: call to '__compiletime_assert_451' declared with attribute error: Need native word sized stores/loads for atomicity.
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:549:25: note: in definition of macro '__compiletime_assert'
     549 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:568:9: note: in expansion of macro '_compiletime_assert'
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:571:9: note: in expansion of macro 'compiletime_assert'
     571 |         compiletime_assert(__native_word(t),                            \
         |         ^~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/barrier.h:69:9: note: in expansion of macro 'compiletime_assert_atomic_type'
      69 |         compiletime_assert_atomic_type(*p);                             \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/barrier.h:176:29: note: in expansion of macro '__smp_load_acquire'
     176 | #define smp_load_acquire(p) __smp_load_acquire(p)
         |                             ^~~~~~~~~~~~~~~~~~
   include/linux/fs.h:960:16: note: in expansion of macro 'smp_load_acquire'
     960 |         return smp_load_acquire(&inode->i_size);
         |                ^~~~~~~~~~~~~~~~


vim +/__compiletime_assert_451 +568 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  554  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  555  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  556  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  557  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  558  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  559   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  560   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  561   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  562   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  563   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  564   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  565   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  566   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  567  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @568  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  569  

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