Re: [PATCH 2/3] cxl/core: Enable Region creation on x86 with Low Memory Hole

[kernel test robot]

Hi Fabio,

kernel test robot noticed the following build warnings:

[auto build test WARNING on cxl/next]
[also build test WARNING on linus/master cxl/pending v6.12 next-20241125]
[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/Fabio-M-De-Francesco/cxl-core-Change-match_-_by_range-calling-convention/20241125-102754
base:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git next
patch link:    https://lore.kernel.org/r/20241122155226.2068287-3-fabio.m.de.francesco%40linux.intel.com
patch subject: [PATCH 2/3] cxl/core: Enable Region creation on x86 with Low Memory Hole
config: i386-buildonly-randconfig-001-20241125 (https://download.01.org/0day-ci/archive/20241125/202411251632.4eenIlnF-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241125/202411251632.4eenIlnF-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411251632.4eenIlnF-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from drivers/cxl/cxlmem.h:12,
                    from drivers/cxl/port.c:7:
>> drivers/cxl/cxl.h:921:6: warning: no previous prototype for 'arch_match_spa' [-Wmissing-prototypes]
     921 | bool arch_match_spa(struct cxl_root_decoder *cxlrd,
         |      ^~~~~~~~~~~~~~
>> drivers/cxl/cxl.h:927:6: warning: no previous prototype for 'arch_match_region' [-Wmissing-prototypes]
     927 | bool arch_match_region(struct cxl_region_params *p,
         |      ^~~~~~~~~~~~~~~~~
>> drivers/cxl/cxl.h:933:6: warning: no previous prototype for 'arch_trim_hpa_by_spa' [-Wmissing-prototypes]
     933 | void arch_trim_hpa_by_spa(struct resource *res,
         |      ^~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [y]:
   - RESOURCE_KUNIT_TEST [=y] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]


vim +/arch_match_spa +921 drivers/cxl/cxl.h

   912	
   913	#ifdef CONFIG_CXL_ARCH_LOW_MEMORY_HOLE
   914	bool arch_match_spa(struct cxl_root_decoder *cxlrd,
   915			    struct cxl_endpoint_decoder *cxled);
   916	bool arch_match_region(struct cxl_region_params *p,
   917			       struct cxl_decoder *cxld);
   918	void arch_trim_hpa_by_spa(struct resource *res,
   919				  struct cxl_root_decoder *cxlrd);
   920	#else
 > 921	bool arch_match_spa(struct cxl_root_decoder *cxlrd,
   922			    struct cxl_endpoint_decoder *cxled)
   923	{
   924		return false;
   925	}
   926	
 > 927	bool arch_match_region(struct cxl_region_params *p,
   928			       struct cxl_decoder *cxld)
   929	{
   930		return false;
   931	}
   932	
 > 933	void arch_trim_hpa_by_spa(struct resource *res,
   934				  struct cxl_root_decoder *cxlrd)
   935	{ }
   936	#endif /* CXL_ARCH_LOW_MEMORY_HOLE */
   937	

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