Re: [Patch v4 03/18] KVM: x86/mmu: Track count of pages in KVM MMU page caches globally

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

Hi Vipin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kvm/queue]
[also build test WARNING on kvmarm/next linus/master v6.3-rc1 next-20230307]
[cannot apply to mst-vhost/linux-next 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/Vipin-Sharma/KVM-x86-mmu-Change-KVM-mmu-shrinker-to-no-op/20230307-064510
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20230306224127.1689967-4-vipinsh%40google.com
patch subject: [Patch v4 03/18] KVM: x86/mmu: Track count of pages in KVM MMU page caches globally
config: i386-randconfig-a003-20230306 (https://download.01.org/0day-ci/archive/20230307/202303071940.sFeQ4FpU-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/511e837798da25063830276b8a3345c7601c6459
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vipin-Sharma/KVM-x86-mmu-Change-KVM-mmu-shrinker-to-no-op/20230307-064510
        git checkout 511e837798da25063830276b8a3345c7601c6459
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303071940.sFeQ4FpU-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kvm/mmu/mmu.c:676: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Caller should hold mutex lock corresponding to cache, if available.
   arch/x86/kvm/mmu/mmu.c:693: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Caller should hold mutex lock corresponding to kvm_mmu_memory_cache, if
   arch/x86/kvm/mmu/mmu.c:1404: warning: Function parameter or member 'kvm' not described in 'kvm_arch_mmu_enable_log_dirty_pt_masked'
   arch/x86/kvm/mmu/mmu.c:1404: warning: Function parameter or member 'slot' not described in 'kvm_arch_mmu_enable_log_dirty_pt_masked'
   arch/x86/kvm/mmu/mmu.c:1404: warning: Function parameter or member 'gfn_offset' not described in 'kvm_arch_mmu_enable_log_dirty_pt_masked'
   arch/x86/kvm/mmu/mmu.c:1404: warning: Function parameter or member 'mask' not described in 'kvm_arch_mmu_enable_log_dirty_pt_masked'


vim +676 arch/x86/kvm/mmu/mmu.c

   674	
   675	/**
 > 676	 * Caller should hold mutex lock corresponding to cache, if available.
   677	 */
   678	static int mmu_topup_sp_memory_cache(struct kvm_mmu_memory_cache *cache,
   679					     int min)
   680	{
   681		int orig_nobjs, r;
   682	
   683		orig_nobjs = cache->nobjs;
   684		r = kvm_mmu_topup_memory_cache(cache, min);
   685		if (orig_nobjs != cache->nobjs)
   686			percpu_counter_add(&kvm_total_unused_cached_pages,
   687					   (cache->nobjs - orig_nobjs));
   688	
   689		return r;
   690	}
   691	

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