[PATCH] powerpc/kdump: Add support for crashkernel CMA reservation

[kernel test robot]

Hi Sourabh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on powerpc/next]
[also build test WARNING on powerpc/fixes linus/master v6.18-rc2 next-20251022]
[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/Sourabh-Jain/powerpc-kdump-Add-support-for-crashkernel-CMA-reservation/20251022-182711
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
patch link:    https://lore.kernel.org/r/20251022102531.657147-1-sourabhjain%40linux.ibm.com
patch subject: [PATCH] powerpc/kdump: Add support for crashkernel CMA reservation
config: powerpc-randconfig-002-20251023 (https://download.01.org/0day-ci/archive/20251023/202510230923.E37rbvtF-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 754ebc6ebb9fb9fbee7aef33478c74ea74949853)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251023/202510230923.E37rbvtF-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510230923.E37rbvtF-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/powerpc/kexec/core.c:37:27: warning: unused variable 'cma_size' [-Wunused-variable]
      37 | static unsigned long long cma_size;
         |                           ^~~~~~~~
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for HOTPLUG_CPU
   Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
   Selected by [y]:
   - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]


vim +/cma_size +37 arch/powerpc/kexec/core.c

    35	
    36	
  > 37	static unsigned long long cma_size;
    38	

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