CC: [email protected] CC: [email protected] TO: Song Liu <[email protected]> CC: Daniel Borkmann <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7c60610d476766e128cc4284bb6349732cbd6606 commit: 39d8f0d1026a990604770a658708f5845f7dbec0 bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI date: 11 months ago :::::: branch date: 12 hours ago :::::: commit date: 11 months ago config: ia64-randconfig-s032-20210816 (attached as .config) compiler: ia64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39d8f0d1026a990604770a658708f5845f7dbec0 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 39d8f0d1026a990604770a658708f5845f7dbec0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=ia64 SHELL=/bin/bash kernel/bpf/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) >> kernel/bpf/percpu_freelist.c:176:17: sparse: sparse: context imbalance in >> '___pcpu_freelist_pop_nmi' - different lock contexts for basic block vim +/___pcpu_freelist_pop_nmi +176 kernel/bpf/percpu_freelist.c 39d8f0d1026a99 Song Liu 2020-10-05 156 39d8f0d1026a99 Song Liu 2020-10-05 157 static struct pcpu_freelist_node * 39d8f0d1026a99 Song Liu 2020-10-05 158 ___pcpu_freelist_pop_nmi(struct pcpu_freelist *s) 39d8f0d1026a99 Song Liu 2020-10-05 159 { 39d8f0d1026a99 Song Liu 2020-10-05 160 struct pcpu_freelist_head *head; 39d8f0d1026a99 Song Liu 2020-10-05 161 struct pcpu_freelist_node *node; 39d8f0d1026a99 Song Liu 2020-10-05 162 int orig_cpu, cpu; 39d8f0d1026a99 Song Liu 2020-10-05 163 39d8f0d1026a99 Song Liu 2020-10-05 164 orig_cpu = cpu = raw_smp_processor_id(); 39d8f0d1026a99 Song Liu 2020-10-05 165 while (1) { 39d8f0d1026a99 Song Liu 2020-10-05 166 head = per_cpu_ptr(s->freelist, cpu); 39d8f0d1026a99 Song Liu 2020-10-05 167 if (raw_spin_trylock(&head->lock)) { 39d8f0d1026a99 Song Liu 2020-10-05 168 node = head->first; 39d8f0d1026a99 Song Liu 2020-10-05 169 if (node) { 39d8f0d1026a99 Song Liu 2020-10-05 170 head->first = node->next; 39d8f0d1026a99 Song Liu 2020-10-05 171 raw_spin_unlock(&head->lock); 39d8f0d1026a99 Song Liu 2020-10-05 172 return node; 39d8f0d1026a99 Song Liu 2020-10-05 173 } 39d8f0d1026a99 Song Liu 2020-10-05 174 raw_spin_unlock(&head->lock); 39d8f0d1026a99 Song Liu 2020-10-05 175 } 39d8f0d1026a99 Song Liu 2020-10-05 @176 cpu = cpumask_next(cpu, cpu_possible_mask); 39d8f0d1026a99 Song Liu 2020-10-05 177 if (cpu >= nr_cpu_ids) 39d8f0d1026a99 Song Liu 2020-10-05 178 cpu = 0; 39d8f0d1026a99 Song Liu 2020-10-05 179 if (cpu == orig_cpu) 39d8f0d1026a99 Song Liu 2020-10-05 180 break; 39d8f0d1026a99 Song Liu 2020-10-05 181 } 39d8f0d1026a99 Song Liu 2020-10-05 182 39d8f0d1026a99 Song Liu 2020-10-05 183 /* cannot pop from per cpu lists, try extralist */ 39d8f0d1026a99 Song Liu 2020-10-05 184 if (!raw_spin_trylock(&s->extralist.lock)) e19494edab82f5 Alexei Starovoitov 2016-03-07 185 return NULL; 39d8f0d1026a99 Song Liu 2020-10-05 186 node = s->extralist.first; 39d8f0d1026a99 Song Liu 2020-10-05 187 if (node) 39d8f0d1026a99 Song Liu 2020-10-05 188 s->extralist.first = node->next; 39d8f0d1026a99 Song Liu 2020-10-05 189 raw_spin_unlock(&s->extralist.lock); 39d8f0d1026a99 Song Liu 2020-10-05 190 return node; e19494edab82f5 Alexei Starovoitov 2016-03-07 191 } 39d8f0d1026a99 Song Liu 2020-10-05 192 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
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