Re: [PATCH v12 20/46] arm64: RMI: Allow populating initial contents

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

Hi Steven,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.19-rc1 next-20251219]
[cannot apply to kvmarm/next kvm/queue kvm/next arm64/for-next/core kvm/linux-next]
[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/Steven-Price/kvm-arm64-Include-kvm_emulate-h-in-kvm-arm_psci-h/20251218-030351
base:   linus/master
patch link:    https://lore.kernel.org/r/20251217101125.91098-21-steven.price%40arm.com
patch subject: [PATCH v12 20/46] arm64: RMI: Allow populating initial contents
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251220/202512202203.1g4jywFB-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251220/202512202203.1g4jywFB-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/202512202203.1g4jywFB-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/rmi.c:805:16: warning: variable 'data_flags' set but not used [-Wunused-but-set-variable]
     805 |         unsigned long data_flags = 0;
         |                       ^
   1 warning generated.


vim +/data_flags +805 arch/arm64/kvm/rmi.c

   801	
   802	int kvm_arm_rmi_populate(struct kvm *kvm,
   803				 struct kvm_arm_rmi_populate *args)
   804	{
 > 805		unsigned long data_flags = 0;
   806		unsigned long ipa_start = args->base;
   807		unsigned long ipa_end = ipa_start + args->size;
   808		int ret;
   809	
   810		if (args->reserved ||
   811		    (args->flags & ~KVM_ARM_RMI_POPULATE_FLAGS_MEASURE) ||
   812		    !IS_ALIGNED(ipa_start, PAGE_SIZE) ||
   813		    !IS_ALIGNED(ipa_end, PAGE_SIZE))
   814			return -EINVAL;
   815	
   816		ret = realm_ensure_created(kvm);
   817		if (ret)
   818			return ret;
   819	
   820		if (args->flags & KVM_ARM_RMI_POPULATE_FLAGS_MEASURE)
   821			data_flags |= RMI_MEASURE_CONTENT;
   822	
   823		ret = populate_region(kvm, gpa_to_gfn(ipa_start),
   824				      args->size >> PAGE_SHIFT,
   825				      args->source_uaddr, args->flags);
   826	
   827		if (ret < 0)
   828			return ret;
   829	
   830		return ret * PAGE_SIZE;
   831	}
   832	

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