bpf: Use rcu_trace_implies_rcu_gp() for program array freeing

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To support both sleepable and normal uprobe bpf program, the freeing of
trace program array chains a RCU-tasks-trace grace period and a normal
RCU grace period one after the other.

With the introduction of rcu_trace_implies_rcu_gp(),
__bpf_prog_array_free_sleepable_cb() 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 invoke kfree() directly.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20221014113946.965131-5-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Hou Tao 2022-10-14 19:39:46 +08:00 • committed by Alexei Starovoitov

parent d39d1445d3

commit 4835f9ee98

1 changed files with 7 additions and 1 deletions

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kernel/bpf/core.c

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