Hi Shameer, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kvmarm/next] [also build test WARNING on arm64/for-next/core arm/for-next soc/for-next rockchip/for-next shawnguo/for-next clk/clk-next v5.14-rc3 next-20210728] [cannot apply to xlnx/master keystone/next linux-rpi/for-rpi-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] url: https://github.com/0day-ci/linux/commits/Shameer-Kolothum/kvm-arm-New-VMID-allocator-based-on-asid/20210729-184607 base: https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 10.3.0 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://github.com/0day-ci/linux/commit/3ffbfe2e26ad324870b87a46b930a9a4c0a8faa1 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Shameer-Kolothum/kvm-arm-New-VMID-allocator-based-on-asid/20210729-184607 git checkout 3ffbfe2e26ad324870b87a46b930a9a4c0a8faa1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): arch/arm64/kvm/vmid.c: In function 'kvm_arm_vmid_update': >> arch/arm64/kvm/vmid.c:122:15: warning: variable 'cpu' set but not used [-Wunused-but-set-variable] 122 | unsigned int cpu; | ^~~ vim +/cpu +122 arch/arm64/kvm/vmid.c 0537d0e3bea2fa Shameer Kolothum 2021-07-29 118 0537d0e3bea2fa Shameer Kolothum 2021-07-29 119 void kvm_arm_vmid_update(struct kvm_vmid *kvm_vmid) 0537d0e3bea2fa Shameer Kolothum 2021-07-29 120 { 0537d0e3bea2fa Shameer Kolothum 2021-07-29 121 unsigned long flags; 0537d0e3bea2fa Shameer Kolothum 2021-07-29 @122 unsigned int cpu; 0537d0e3bea2fa Shameer Kolothum 2021-07-29 123 u64 vmid, old_active_vmid; 0537d0e3bea2fa Shameer Kolothum 2021-07-29 124 0537d0e3bea2fa Shameer Kolothum 2021-07-29 125 vmid = atomic64_read(&kvm_vmid->id); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 126 0537d0e3bea2fa Shameer Kolothum 2021-07-29 127 /* 0537d0e3bea2fa Shameer Kolothum 2021-07-29 128 * Please refer comments in check_and_switch_context() in 0537d0e3bea2fa Shameer Kolothum 2021-07-29 129 * arch/arm64/mm/context.c. 0537d0e3bea2fa Shameer Kolothum 2021-07-29 130 */ 0537d0e3bea2fa Shameer Kolothum 2021-07-29 131 old_active_vmid = atomic64_read(this_cpu_ptr(&active_vmids)); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 132 if (old_active_vmid && vmid_gen_match(vmid) && 0537d0e3bea2fa Shameer Kolothum 2021-07-29 133 atomic64_cmpxchg_relaxed(this_cpu_ptr(&active_vmids), 0537d0e3bea2fa Shameer Kolothum 2021-07-29 134 old_active_vmid, vmid)) 0537d0e3bea2fa Shameer Kolothum 2021-07-29 135 return; 0537d0e3bea2fa Shameer Kolothum 2021-07-29 136 0537d0e3bea2fa Shameer Kolothum 2021-07-29 137 raw_spin_lock_irqsave(&cpu_vmid_lock, flags); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 138 0537d0e3bea2fa Shameer Kolothum 2021-07-29 139 /* Check that our VMID belongs to the current generation. */ 0537d0e3bea2fa Shameer Kolothum 2021-07-29 140 vmid = atomic64_read(&kvm_vmid->id); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 141 if (!vmid_gen_match(vmid)) { 0537d0e3bea2fa Shameer Kolothum 2021-07-29 142 vmid = new_vmid(kvm_vmid); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 143 atomic64_set(&kvm_vmid->id, vmid); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 144 } 0537d0e3bea2fa Shameer Kolothum 2021-07-29 145 0537d0e3bea2fa Shameer Kolothum 2021-07-29 146 cpu = smp_processor_id(); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 147 0537d0e3bea2fa Shameer Kolothum 2021-07-29 148 atomic64_set(this_cpu_ptr(&active_vmids), vmid); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 149 raw_spin_unlock_irqrestore(&cpu_vmid_lock, flags); 0537d0e3bea2fa Shameer Kolothum 2021-07-29 150 } 0537d0e3bea2fa Shameer Kolothum 2021-07-29 151 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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