linux-kernel - arch/riscv/kvm/vcpu_timer.c:302:23: warning: variable 'csr' set but not used

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Message-ID: <202208191955.gp7xM6nG-lkp@intel.com>
Date:   Fri, 19 Aug 2022 19:05:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     Atish Patra <atishp@...osinc.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
        Anup Patel <anup@...infault.org>
Subject: arch/riscv/kvm/vcpu_timer.c:302:23: warning: variable 'csr' set but
 not used

arch/riscv/include/asm/kvm_vcpu_timer.h
arch/riscv/include/uapi/asm/kvm.h
arch/riscv/kvm/vcpu.c
arch/riscv/kvm/vcpu_timer.c
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4c2d0b039c5cc0112206a5b22431b577cb1c57ad
commit: 8f5cb44b1bae8520c0705ce348b30ffb1fdda43a RISC-V: KVM: Support sstc extension
date:   7 days ago
config: riscv-randconfig-r023-20220819 (https://download.01.org/0day-ci/archive/20220819/202208191955.gp7xM6nG-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 0ac597f3cacf60479ffd36b03766fa7462dabd78)
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
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8f5cb44b1bae8520c0705ce348b30ffb1fdda43a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 8f5cb44b1bae8520c0705ce348b30ffb1fdda43a
        # 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=riscv SHELL=/bin/bash arch/riscv/kvm/

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

All warnings (new ones prefixed by >>):

>> arch/riscv/kvm/vcpu_timer.c:302:23: warning: variable 'csr' set but not used [-Wunused-but-set-variable]
           struct kvm_vcpu_csr *csr;
                                ^
   arch/riscv/kvm/vcpu_timer.c:327:23: warning: variable 'csr' set but not used [-Wunused-but-set-variable]
           struct kvm_vcpu_csr *csr;
                                ^
   2 warnings generated.


vim +/csr +302 arch/riscv/kvm/vcpu_timer.c

   299	
   300	void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
   301	{
 > 302		struct kvm_vcpu_csr *csr;
   303		struct kvm_vcpu_timer *t = &vcpu->arch.timer;
   304	
   305		kvm_riscv_vcpu_update_timedelta(vcpu);
   306	
   307		if (!t->sstc_enabled)
   308			return;
   309	
   310		csr = &vcpu->arch.guest_csr;
   311	#if defined(CONFIG_32BIT)
   312		csr_write(CSR_VSTIMECMP, (u32)t->next_cycles);
   313		csr_write(CSR_VSTIMECMPH, (u32)(t->next_cycles >> 32));
   314	#else
   315		csr_write(CSR_VSTIMECMP, t->next_cycles);
   316	#endif
   317	
   318		/* timer should be enabled for the remaining operations */
   319		if (unlikely(!t->init_done))
   320			return;
   321	
   322		kvm_riscv_vcpu_timer_unblocking(vcpu);
   323	}
   324	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp