linux-kernel - arch/arm64/kvm/hyp/nvhe/setup.c:133:17: warning: no previous prototype for '__pkvm_init

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Date:   Thu, 1 Jul 2021 19:49:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Quentin Perret <qperret@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>
Subject: arch/arm64/kvm/hyp/nvhe/setup.c:133:17: warning: no previous
 prototype for '__pkvm_init_finalise'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dbe69e43372212527abf48609aba7fc39a6daa27
commit: f320bc742bc23c1d43567712fe2814bf04b19ebc KVM: arm64: Prepare the creation of s1 mappings at EL2
date:   3 months ago
config: arm64-buildonly-randconfig-r002-20210701 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f320bc742bc23c1d43567712fe2814bf04b19ebc
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f320bc742bc23c1d43567712fe2814bf04b19ebc
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/hyp/nvhe/setup.c:133:17: warning: no previous prototype for '__pkvm_init_finalise' [-Wmissing-prototypes]
     133 | void __noreturn __pkvm_init_finalise(void)
         |                 ^~~~~~~~~~~~~~~~~~~~


vim +/__pkvm_init_finalise +133 arch/arm64/kvm/hyp/nvhe/setup.c

   132	
 > 133	void __noreturn __pkvm_init_finalise(void)
   134	{
   135		struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data);
   136		struct kvm_cpu_context *host_ctxt = &host_data->host_ctxt;
   137		unsigned long nr_pages, reserved_pages, pfn;
   138		int ret;
   139	
   140		/* Now that the vmemmap is backed, install the full-fledged allocator */
   141		pfn = hyp_virt_to_pfn(hyp_pgt_base);
   142		nr_pages = hyp_s1_pgtable_pages();
   143		reserved_pages = hyp_early_alloc_nr_used_pages();
   144		ret = hyp_pool_init(&hpool, pfn, nr_pages, reserved_pages);
   145		if (ret)
   146			goto out;
   147	
   148		pkvm_pgtable_mm_ops = (struct kvm_pgtable_mm_ops) {
   149			.zalloc_page = hyp_zalloc_hyp_page,
   150			.phys_to_virt = hyp_phys_to_virt,
   151			.virt_to_phys = hyp_virt_to_phys,
   152			.get_page = hyp_get_page,
   153			.put_page = hyp_put_page,
   154		};
   155		pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops;
   156	
   157	out:
   158		/*
   159		 * We tail-called to here from handle___pkvm_init() and will not return,
   160		 * so make sure to propagate the return value to the host.
   161		 */
   162		cpu_reg(host_ctxt, 1) = ret;
   163	
   164		__host_enter(host_ctxt);
   165	}
   166	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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