MIPS: KVM: Fix a build warning about variable set but not used

[ Upstream commit 83767a67e7b6a0291cde5681ec7e3708f3f8f877 ]

After commit 411740f5422a ("KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU")
old_pte is no longer used in kvm_mips_map_page(). So remove it to fix a
build warning about variable set but not used:

   arch/mips/kvm/mmu.c: In function 'kvm_mips_map_page':
>> arch/mips/kvm/mmu.c:701:29: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
     701 |         pte_t *ptep, entry, old_pte;
         |                             ^~~~~~~

Cc: stable@vger.kernel.org
Fixes: 411740f5422a960 ("KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310070530.aARZCSfh-lkp@intel.com/
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 74cd64a..19ec27b 100644 (file)
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -593,7 +593,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
        gfn_t gfn = gpa >> PAGE_SHIFT;
        int srcu_idx, err;
        kvm_pfn_t pfn;
-       pte_t *ptep, entry, old_pte;
+       pte_t *ptep, entry;
        bool writeable;
        unsigned long prot_bits;
        unsigned long mmu_seq;
@@ -665,7 +665,6 @@ retry:
        entry = pfn_pte(pfn, __pgprot(prot_bits));
 
        /* Write the PTE */
-       old_pte = *ptep;
        set_pte(ptep, entry);
 
        err = 0;