[kvm:queue 15/59] arch/x86/kvm/mmu/mmu.c:6391:12: error: variable 'pfn' set but not used

kernel test robot
2022-08-02T00:55:00Z

tree: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
head: 93472b79715378a2386598d6632c654a2223267b
commit: a8ac499bb6abbd55fe60f1dc2d053f4b5b13aa73 [15/59] KVM: x86/mmu: Don't require refcounted "struct page" to create huge SPTEs
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220802/202208020810.BX9p3C93-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 52cd00cabf479aa7eb6dbb063b7ba41ea57bce9e)
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/virt/kvm/kvm.git/commit/?id=a8ac499bb6abbd55fe60f1dc2d053f4b5b13aa73
git remote add kvm https://git.kernel.org/pub/scm/virt/kvm/kvm.git
git fetch --no-tags kvm queue
git checkout a8ac499bb6abbd55fe60f1dc2d053f4b5b13aa73
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/x86/kvm/mmu/mmu.c:6391:12: error: variable 'pfn' set but not used [-Werror,-Wunused-but-set-variable]
kvm_pfn_t pfn;
^
1 error generated.

vim +/pfn +6391 arch/x86/kvm/mmu/mmu.c

a3fe5dbda0a4bb arch/x86/kvm/mmu/mmu.c David Matlack 2022-01-19 6383
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6384 static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
0a234f5dd06582 arch/x86/kvm/mmu/mmu.c Sean Christopherson 2021-02-12 6385 struct kvm_rmap_head *rmap_head,
269e9552d20817 arch/x86/kvm/mmu/mmu.c Hamza Mahfooz 2021-07-12 6386 const struct kvm_memory_slot *slot)
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6387 {
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6388 u64 *sptep;
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6389 struct rmap_iterator iter;
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6390 int need_tlb_flush = 0;
ba049e93aef7e8 arch/x86/kvm/mmu.c Dan Williams 2016-01-15 @6391 kvm_pfn_t pfn;
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6392 struct kvm_mmu_page *sp;
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6393
0d5367900a319a arch/x86/kvm/mmu.c Xiao Guangrong 2015-05-13 6394 restart:
018aabb56d6109 arch/x86/kvm/mmu.c Takuya Yoshikawa 2015-11-20 6395 for_each_rmap_spte(rmap_head, &iter, sptep) {
573546820b792e arch/x86/kvm/mmu/mmu.c Sean Christopherson 2020-06-22 6396 sp = sptep_to_sp(sptep);
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6397 pfn = spte_to_pfn(*sptep);
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6398
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6399 /*
decf63336e3564 arch/x86/kvm/mmu.c Xiao Guangrong 2015-04-14 6400 * We cannot do huge page mapping for indirect shadow pages,
decf63336e3564 arch/x86/kvm/mmu.c Xiao Guangrong 2015-04-14 6401 * which are found on the last rmap (level = 1) when not using
decf63336e3564 arch/x86/kvm/mmu.c Xiao Guangrong 2015-04-14 6402 * tdp; such shadow pages are synced with the page table in
decf63336e3564 arch/x86/kvm/mmu.c Xiao Guangrong 2015-04-14 6403 * the guest, and the guest page table is using 4K page size
decf63336e3564 arch/x86/kvm/mmu.c Xiao Guangrong 2015-04-14 6404 * mapping if the indirect sp has level = 1.
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6405 */
5d49f08c2e08c1 arch/x86/kvm/mmu/mmu.c Sean Christopherson 2022-04-29 6406 if (sp->role.direct &&
9eba50f8d7fcb6 arch/x86/kvm/mmu/mmu.c Sean Christopherson 2021-02-12 6407 sp->role.level < kvm_mmu_max_mapping_level(kvm, slot, sp->gfn,
a8ac499bb6abbd arch/x86/kvm/mmu/mmu.c Sean Christopherson 2022-07-15 6408 PG_LEVEL_NUM)) {
9202aee816c84d arch/x86/kvm/mmu/mmu.c Sean Christopherson 2022-07-15 6409 kvm_zap_one_rmap_spte(kvm, rmap_head, sptep);
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6410
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6411 if (kvm_available_flush_tlb_with_range())
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6412 kvm_flush_remote_tlbs_with_address(kvm, sp->gfn,
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6413 KVM_PAGES_PER_HPAGE(sp->role.level));
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6414 else
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6415 need_tlb_flush = 1;
40ef75a758b291 arch/x86/kvm/mmu.c Lan Tianyu 2018-12-06 6416
0d5367900a319a arch/x86/kvm/mmu.c Xiao Guangrong 2015-05-13 6417 goto restart;
0d5367900a319a arch/x86/kvm/mmu.c Xiao Guangrong 2015-05-13 6418 }
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6419 }
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6420
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6421 return need_tlb_flush;
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6422 }
3ea3b7fa9af067 arch/x86/kvm/mmu.c Wanpeng Li 2015-04-03 6423

:::::: The code at line 6391 was first introduced by commit
:::::: ba049e93aef7e8c571567088b1b73f4f5b99272a kvm: rename pfn_t to kvm_pfn_t

:::::: TO: Dan Williams <dan.j.williams@intel.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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