Re: [PATCH] mm/pageblock: throw compiling time error if pageblock_bits can not hold MIGRATE_TYPES

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

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Hi Pingfan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc5 next-20181206]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Pingfan-Liu/mm-pageblock-throw-compiling-time-error-if-pageblock_bits-can-not-hold-MIGRATE_TYPES/20181207-034245
config: x86_64-randconfig-x011-201848 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

   In file included from include/asm-generic/bug.h:5:0,
                    from arch/x86/include/asm/bug.h:47,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from mm/page_alloc.c:18:
   mm/page_alloc.c: In function 'set_pfnblock_flags_mask':
>> include/linux/compiler.h:372:38: error: call to '__compiletime_assert_428' declared with attribute error: BUILD_BUG_ON failed: order_base_2(MIGRATE_TYPES) != PB_migratetype_bits
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:353:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:372:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:69:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^~~~~~~~~~~~~~~~
>> mm/page_alloc.c:428:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(order_base_2(MIGRATE_TYPES) != PB_migratetype_bits);
     ^~~~~~~~~~~~

vim +/__compiletime_assert_428 +372 include/linux/compiler.h

9a8ab1c3 Daniel Santos 2013-02-21  358  
9a8ab1c3 Daniel Santos 2013-02-21  359  #define _compiletime_assert(condition, msg, prefix, suffix) \
9a8ab1c3 Daniel Santos 2013-02-21  360  	__compiletime_assert(condition, msg, prefix, suffix)
9a8ab1c3 Daniel Santos 2013-02-21  361  
9a8ab1c3 Daniel Santos 2013-02-21  362  /**
9a8ab1c3 Daniel Santos 2013-02-21  363   * compiletime_assert - break build and emit msg if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  364   * @condition: a compile-time constant condition to check
9a8ab1c3 Daniel Santos 2013-02-21  365   * @msg:       a message to emit if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  366   *
9a8ab1c3 Daniel Santos 2013-02-21  367   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos 2013-02-21  368   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos 2013-02-21  369   * compiler has support to do so.
9a8ab1c3 Daniel Santos 2013-02-21  370   */
9a8ab1c3 Daniel Santos 2013-02-21  371  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos 2013-02-21 @372  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos 2013-02-21  373  

:::::: The code at line 372 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@pobox.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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0-DAY kernel test infrastructure                Open Source Technology Center
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