Re: [RFC PATCH] mm/hugetlb_cma: round up per_node before logging it

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

Hi Sang-Heon,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on v7.0]
[also build test ERROR on linus/master]
[cannot apply to akpm-mm/mm-everything next-20260428]
[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/Sang-Heon-Jeon/mm-hugetlb_cma-round-up-per_node-before-logging-it/20260427-012923
base:   v7.0
patch link:    https://lore.kernel.org/r/20260421230220.4122996-1-ekffu200098%40gmail.com
patch subject: [RFC PATCH] mm/hugetlb_cma: round up per_node before logging it
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20260429/202604290752.kPjM1Hkb-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260429/202604290752.kPjM1Hkb-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/202604290752.kPjM1Hkb-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:31,
                    from arch/x86/include/asm/bug.h:193,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:7,
                    from mm/hugetlb_cma.c:3:
   mm/hugetlb_cma.c: In function 'hugetlb_cma_reserve':
>> include/linux/printk.h:481:10: error: expected expression before '{' token
     481 |         ({                                                              \
         |          ^
   include/linux/printk.h:511:26: note: in expansion of macro 'printk_index_wrap'
     511 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
         |                          ^~~~~~~~~~~~~~~~~
   include/linux/printk.h:584:9: note: in expansion of macro 'printk'
     584 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   mm/hugetlb_cma.c:208:17: note: in expansion of macro 'pr_info'
     208 |                 pr_info("hugetlb_cma: reserve %lu MiB, up to %lu MiB per node\n",
         |                 ^~~~~~~
   In file included from include/linux/math64.h:6,
                    from include/linux/time64.h:5,
                    from include/linux/restart_block.h:9,
                    from include/linux/thread_info.h:14,
                    from include/linux/spinlock.h:60,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/mm.h:8:
>> include/linux/math.h:25:55: error: called object is not a function or function pointer
      25 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
         |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
   mm/hugetlb_cma.c:207:28: note: in expansion of macro 'round_up'
     207 |                 per_node = round_up(per_node, PAGE_SIZE << order)
         |                            ^~~~~~~~


vim +481 include/linux/printk.h

337015573718b1 Chris Down 2021-06-15  459  
337015573718b1 Chris Down 2021-06-15  460  /*
337015573718b1 Chris Down 2021-06-15  461   * Some subsystems have their own custom printk that applies a va_format to a
337015573718b1 Chris Down 2021-06-15  462   * generic format, for example, to include a device number or other metadata
337015573718b1 Chris Down 2021-06-15  463   * alongside the format supplied by the caller.
337015573718b1 Chris Down 2021-06-15  464   *
337015573718b1 Chris Down 2021-06-15  465   * In order to store these in the way they would be emitted by the printk
337015573718b1 Chris Down 2021-06-15  466   * infrastructure, the subsystem provides us with the start, fixed string, and
337015573718b1 Chris Down 2021-06-15  467   * any subsequent text in the format string.
337015573718b1 Chris Down 2021-06-15  468   *
337015573718b1 Chris Down 2021-06-15  469   * We take a variable argument list as pr_fmt/dev_fmt/etc are sometimes passed
337015573718b1 Chris Down 2021-06-15  470   * as multiple arguments (eg: `"%s: ", "blah"`), and we must only take the
337015573718b1 Chris Down 2021-06-15  471   * first one.
337015573718b1 Chris Down 2021-06-15  472   *
337015573718b1 Chris Down 2021-06-15  473   * subsys_fmt_prefix must be known at compile time, or compilation will fail
337015573718b1 Chris Down 2021-06-15  474   * (since this is a mistake). If fmt or level is not known at compile time, no
337015573718b1 Chris Down 2021-06-15  475   * index entry will be made (since this can legitimately happen).
337015573718b1 Chris Down 2021-06-15  476   */
337015573718b1 Chris Down 2021-06-15  477  #define printk_index_subsys_emit(subsys_fmt_prefix, level, fmt, ...) \
337015573718b1 Chris Down 2021-06-15  478  	__printk_index_emit(fmt, level, subsys_fmt_prefix)
337015573718b1 Chris Down 2021-06-15  479  
337015573718b1 Chris Down 2021-06-15  480  #define printk_index_wrap(_p_func, _fmt, ...)				\
337015573718b1 Chris Down 2021-06-15 @481  	({								\
337015573718b1 Chris Down 2021-06-15  482  		__printk_index_emit(_fmt, NULL, NULL);			\
337015573718b1 Chris Down 2021-06-15  483  		_p_func(_fmt, ##__VA_ARGS__);				\
337015573718b1 Chris Down 2021-06-15  484  	})
337015573718b1 Chris Down 2021-06-15  485  
337015573718b1 Chris Down 2021-06-15  486  

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