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| author | Hou Tao <houtao1@huawei.com> | 2022-10-14 19:39:45 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-10-18 10:27:02 -0700 |
| commit | d39d1445d37747032e2b26732fed6fe25161cd36 (patch) | |
| tree | c7d7ca9a9cd280148fea567c5d7036076c574b48 /kernel/notifier.c | |
| parent | 59be91e5e70a1aa91dfee8088b071f6d05c8a1a3 (diff) | |
bpf: Use rcu_trace_implies_rcu_gp() in local storage map
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>
Diffstat (limited to 'kernel/notifier.c')
0 files changed, 0 insertions, 0 deletions