Re: [PATCH v3 6/9] x86: kdump: use generic interface to simplify crashkernel reservation code

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

Hi Baoquan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on powerpc/next]
[also build test WARNING on powerpc/fixes linus/master v6.6-rc1 next-20230914]
[cannot apply to arm64/for-next/core tip/x86/core]
[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/Baoquan-He/crash_core-c-remove-unnecessary-parameter-of-function/20230914-113546
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
patch link:    https://lore.kernel.org/r/20230914033142.676708-7-bhe%40redhat.com
patch subject: [PATCH v3 6/9] x86: kdump: use generic interface to simplify crashkernel reservation code
config: i386-randconfig-003-20230915 (https://download.01.org/0day-ci/archive/20230915/202309150538.TyCUwATI-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230915/202309150538.TyCUwATI-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/202309150538.TyCUwATI-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/setup.c:476:15: warning: no previous declaration for 'crash_low_size_default' [-Wmissing-declarations]
    unsigned long crash_low_size_default(void)
                  ^~~~~~~~~~~~~~~~~~~~~~


vim +/crash_low_size_default +476 arch/x86/kernel/setup.c

   472	
   473	/*
   474	 * --------- Crashkernel reservation ------------------------------
   475	 */
 > 476	unsigned long crash_low_size_default(void)
   477	{
   478	#ifdef CONFIG_X86_64
   479		return max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
   480	#else
   481		return 0;
   482	#endif
   483	}
   484	

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