* Re: [PATCH] srcutree: Skip torture to-big transition for atomic SRCU [not found] <20260910041427.3579817-1-kunwu.chan@gmail.com> @ 2026-09-10 14:34 ` kernel test robot 2026-09-10 16:54 ` Paul E. McKenney 0 siblings, 1 reply; 2+ messages in thread From: kernel test robot @ 2026-09-10 14:34 UTC (permalink / raw) To: Kunwu Chan, jiangshanlai, paulmck, josh, rostedt, mathieu.desnoyers Cc: llvm, oe-kbuild-all, rcu, linux-kernel, Kunwu Chan Hi Kunwu, kernel test robot noticed the following build errors: [auto build test ERROR on rcu/rcu/dev] [also build test ERROR on linus/master v7.3-rc2 next-20260909] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Kunwu-Chan/srcutree-Skip-torture-to-big-transition-for-atomic-SRCU/20260910-121427 base: https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git rcu/dev patch link: https://lore.kernel.org/r/20260910041427.3579817-1-kunwu.chan%40gmail.com patch subject: [PATCH] srcutree: Skip torture to-big transition for atomic SRCU config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260910/202609102247.8X7GUWSj-lkp@intel.com/config) compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project d3db069999553568848400c84cbf815c03f5470f) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260910/202609102247.8X7GUWSj-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202609102247.8X7GUWSj-lkp@intel.com/ All errors (new ones prefixed by >>): >> kernel/rcu/srcutree.c:2080:61: error: use of undeclared identifier 'SRCU_READ_FLAVOR_ATOMIC' 2080 | if (SRCU_SIZING_IS_TORTURE() && ssp->srcu_reader_flavor != SRCU_READ_FLAVOR_ATOMIC) | ^~~~~~~~~~~~~~~~~~~~~~~ 1 error generated. vim +/SRCU_READ_FLAVOR_ATOMIC +2080 kernel/rcu/srcutree.c 2031 2032 void srcu_torture_stats_print(struct srcu_struct *ssp, char *tt, char *tf) 2033 { 2034 int cpu; 2035 int idx; 2036 unsigned long s0 = 0, s1 = 0; 2037 int ss_state = READ_ONCE(ssp->srcu_sup->srcu_size_state); 2038 int ss_state_idx = ss_state; 2039 2040 idx = ssp->srcu_ctrp - &ssp->sda->srcu_ctrs[0]; 2041 if (ss_state < 0 || ss_state >= ARRAY_SIZE(srcu_size_state_name)) 2042 ss_state_idx = ARRAY_SIZE(srcu_size_state_name) - 1; 2043 pr_alert("%s%s Tree SRCU g%ld state %d (%s)", 2044 tt, tf, rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq), ss_state, 2045 srcu_size_state_name[ss_state_idx]); 2046 if (!ssp->sda) { 2047 // Called after cleanup_srcu_struct(), perhaps. 2048 pr_cont(" No per-CPU srcu_data structures (->sda == NULL).\n"); 2049 } else { 2050 pr_cont(" per-CPU(idx=%d):", idx); 2051 for_each_possible_cpu(cpu) { 2052 unsigned long l0, l1; 2053 unsigned long u0, u1; 2054 long c0, c1; 2055 struct srcu_data *sdp; 2056 2057 sdp = per_cpu_ptr(ssp->sda, cpu); 2058 u0 = data_race(atomic_long_read(&sdp->srcu_ctrs[!idx].srcu_unlocks)); 2059 u1 = data_race(atomic_long_read(&sdp->srcu_ctrs[idx].srcu_unlocks)); 2060 2061 /* 2062 * Make sure that a lock is always counted if the corresponding 2063 * unlock is counted. 2064 */ 2065 smp_rmb(); 2066 2067 l0 = data_race(atomic_long_read(&sdp->srcu_ctrs[!idx].srcu_locks)); 2068 l1 = data_race(atomic_long_read(&sdp->srcu_ctrs[idx].srcu_locks)); 2069 2070 c0 = l0 - u0; 2071 c1 = l1 - u1; 2072 pr_cont(" %d(%ld,%ld %c)", 2073 cpu, c0, c1, 2074 "C."[rcu_segcblist_empty(&sdp->srcu_cblist)]); 2075 s0 += c0; 2076 s1 += c1; 2077 } 2078 pr_cont(" T(%ld,%ld)\n", s0, s1); 2079 } > 2080 if (SRCU_SIZING_IS_TORTURE() && ssp->srcu_reader_flavor != SRCU_READ_FLAVOR_ATOMIC) 2081 srcu_transition_to_big(ssp); 2082 } 2083 EXPORT_SYMBOL_GPL(srcu_torture_stats_print); 2084 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] srcutree: Skip torture to-big transition for atomic SRCU 2026-09-10 14:34 ` [PATCH] srcutree: Skip torture to-big transition for atomic SRCU kernel test robot @ 2026-09-10 16:54 ` Paul E. McKenney 0 siblings, 0 replies; 2+ messages in thread From: Paul E. McKenney @ 2026-09-10 16:54 UTC (permalink / raw) To: kernel test robot Cc: Kunwu Chan, jiangshanlai, josh, rostedt, mathieu.desnoyers, llvm, oe-kbuild-all, rcu, linux-kernel On Thu, Sep 10, 2026 at 10:34:21PM +0800, kernel test robot wrote: > Hi Kunwu, > > kernel test robot noticed the following build errors: > > [auto build test ERROR on rcu/rcu/dev] > [also build test ERROR on linus/master v7.3-rc2 next-20260909] > [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#_base_tree_information] Indeed, this patch would need to be applied to the "dev" branch of my -rcu tree. Thanx, Paul > url: https://github.com/intel-lab-lkp/linux/commits/Kunwu-Chan/srcutree-Skip-torture-to-big-transition-for-atomic-SRCU/20260910-121427 > base: https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git rcu/dev > patch link: https://lore.kernel.org/r/20260910041427.3579817-1-kunwu.chan%40gmail.com > patch subject: [PATCH] srcutree: Skip torture to-big transition for atomic SRCU > config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260910/202609102247.8X7GUWSj-lkp@intel.com/config) > compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project d3db069999553568848400c84cbf815c03f5470f) > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260910/202609102247.8X7GUWSj-lkp@intel.com/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@intel.com> > | Closes: https://lore.kernel.org/oe-kbuild-all/202609102247.8X7GUWSj-lkp@intel.com/ > > All errors (new ones prefixed by >>): > > >> kernel/rcu/srcutree.c:2080:61: error: use of undeclared identifier 'SRCU_READ_FLAVOR_ATOMIC' > 2080 | if (SRCU_SIZING_IS_TORTURE() && ssp->srcu_reader_flavor != SRCU_READ_FLAVOR_ATOMIC) > | ^~~~~~~~~~~~~~~~~~~~~~~ > 1 error generated. > > > vim +/SRCU_READ_FLAVOR_ATOMIC +2080 kernel/rcu/srcutree.c > > 2031 > 2032 void srcu_torture_stats_print(struct srcu_struct *ssp, char *tt, char *tf) > 2033 { > 2034 int cpu; > 2035 int idx; > 2036 unsigned long s0 = 0, s1 = 0; > 2037 int ss_state = READ_ONCE(ssp->srcu_sup->srcu_size_state); > 2038 int ss_state_idx = ss_state; > 2039 > 2040 idx = ssp->srcu_ctrp - &ssp->sda->srcu_ctrs[0]; > 2041 if (ss_state < 0 || ss_state >= ARRAY_SIZE(srcu_size_state_name)) > 2042 ss_state_idx = ARRAY_SIZE(srcu_size_state_name) - 1; > 2043 pr_alert("%s%s Tree SRCU g%ld state %d (%s)", > 2044 tt, tf, rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq), ss_state, > 2045 srcu_size_state_name[ss_state_idx]); > 2046 if (!ssp->sda) { > 2047 // Called after cleanup_srcu_struct(), perhaps. > 2048 pr_cont(" No per-CPU srcu_data structures (->sda == NULL).\n"); > 2049 } else { > 2050 pr_cont(" per-CPU(idx=%d):", idx); > 2051 for_each_possible_cpu(cpu) { > 2052 unsigned long l0, l1; > 2053 unsigned long u0, u1; > 2054 long c0, c1; > 2055 struct srcu_data *sdp; > 2056 > 2057 sdp = per_cpu_ptr(ssp->sda, cpu); > 2058 u0 = data_race(atomic_long_read(&sdp->srcu_ctrs[!idx].srcu_unlocks)); > 2059 u1 = data_race(atomic_long_read(&sdp->srcu_ctrs[idx].srcu_unlocks)); > 2060 > 2061 /* > 2062 * Make sure that a lock is always counted if the corresponding > 2063 * unlock is counted. > 2064 */ > 2065 smp_rmb(); > 2066 > 2067 l0 = data_race(atomic_long_read(&sdp->srcu_ctrs[!idx].srcu_locks)); > 2068 l1 = data_race(atomic_long_read(&sdp->srcu_ctrs[idx].srcu_locks)); > 2069 > 2070 c0 = l0 - u0; > 2071 c1 = l1 - u1; > 2072 pr_cont(" %d(%ld,%ld %c)", > 2073 cpu, c0, c1, > 2074 "C."[rcu_segcblist_empty(&sdp->srcu_cblist)]); > 2075 s0 += c0; > 2076 s1 += c1; > 2077 } > 2078 pr_cont(" T(%ld,%ld)\n", s0, s1); > 2079 } > > 2080 if (SRCU_SIZING_IS_TORTURE() && ssp->srcu_reader_flavor != SRCU_READ_FLAVOR_ATOMIC) > 2081 srcu_transition_to_big(ssp); > 2082 } > 2083 EXPORT_SYMBOL_GPL(srcu_torture_stats_print); > 2084 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki ^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-09-10 14:34 ` [PATCH] srcutree: Skip torture to-big transition for atomic SRCU kernel test robot
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