Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\arraymap.c Create Date:2022-07-28 13:11:21
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name:percpu_array_map_seq_show_elem

Proto:static void percpu_array_map_seq_show_elem(struct bpf_map *map, void *key, struct seq_file *m)

Type:void

Parameter:

TypeParameterName
struct bpf_map *map
void *key
struct seq_file *m
429  array = container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(map, structbpf_array, map)
430  index = key
431  __percpu * pptr
434  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
436  seq_printf(m, "%u: {\n", * (u32 * )key)
437  pptr = pptrs[index & index_mask]
438  for_each_possible_cpu(cpu)
439  seq_printf(m, "\tcpu%d: ", cpu)
440  btf_type_seq_show(btf, btf_value_type_id, per_cpu_ptr(pptr, cpu), m)
442  seq_puts(m, "\n")
444  seq_puts(m, "}\n")
446  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()