bpf: Use rcu_trace_implies_rcu_gp() in local storage map

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Local storage map is accessible for both sleepable and non-sleepable bpf
program, and its memory is freed by using both call_rcu_tasks_trace() and
kfree_rcu() to wait for both RCU-tasks-trace grace period and RCU grace
period to pass.

With the introduction of rcu_trace_implies_rcu_gp(), both
bpf_selem_free_rcu() and bpf_local_storage_free_rcu() can check whether
or not a normal RCU grace period has also passed after a RCU-tasks-trace
grace period has passed. If it is true, it is safe to call kfree()
directly.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20221014113946.965131-4-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Hou Tao 2022-10-14 19:39:45 +08:00 • committed by Alexei Starovoitov

parent 59be91e5e7

commit d39d1445d3

1 changed files with 11 additions and 2 deletions

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kernel/bpf/bpf_local_storage.c

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