Re: [PATCH] err.h: add type checking to IS_ERR_VALUE macro

[kbuild test robot]

Hi Andrzej,

[auto build test ERROR on v4.4-rc5]
[also build test ERROR on next-20151217]

url:    https://github.com/0day-ci/linux/commits/Andrzej-Hajda/err-h-add-type-checking-to-IS_ERR_VALUE-macro/20151218-185839
config: i386-randconfig-s1-201550 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/linkage.h:4:0,
                    from include/linux/preempt.h:9,
                    from include/linux/spinlock.h:50,
                    from include/linux/mmzone.h:7,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from drivers/char/mem.c:11:
   drivers/char/mem.c: In function 'memory_lseek':
>> include/linux/compiler.h:484:38: error: call to '__compiletime_assert_698' declared with attribute error: Invalid IS_ERR_VALUE argument type
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:467:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^
   include/linux/compiler.h:484:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^
   include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^
>> include/linux/err.h:24:5: note: in expansion of macro 'BUILD_BUG_ON_MSG'
        BUILD_BUG_ON_MSG((typeof(x))(-MAX_ERRNO) != (unsigned long)-MAX_ERRNO, "Invalid IS_ERR_VALUE argument type");\
        ^
>> drivers/char/mem.c:698:7: note: in expansion of macro 'IS_ERR_VALUE'
      if (IS_ERR_VALUE((unsigned long long)offset)) {
          ^

vim +/__compiletime_assert_698 +484 include/linux/compiler.h

9a8ab1c3 Daniel Santos  2013-02-21  478   *
9a8ab1c3 Daniel Santos  2013-02-21  479   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos  2013-02-21  480   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos  2013-02-21  481   * compiler has support to do so.
9a8ab1c3 Daniel Santos  2013-02-21  482   */
9a8ab1c3 Daniel Santos  2013-02-21  483  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos  2013-02-21 @484  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos  2013-02-21  485  
47933ad4 Peter Zijlstra 2013-11-06  486  #define compiletime_assert_atomic_type(t)				\
47933ad4 Peter Zijlstra 2013-11-06  487  	compiletime_assert(__native_word(t),				\

:::::: The code at line 484 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@xxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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