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author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2022-06-08 01:11:12 +0900 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-06-17 21:53:35 +0200 |
commit | c0f3bb4054ef036e5f67e27f2e3cad9e6512cf00 (patch) | |
tree | 3a8b879d974634df53f0777bc000184cd21590a7 /tools/testing/selftests/bpf/prog_tests/perf_branches.c | |
parent | c88dbbcd88c233cb759ec857b57864c5bfcea26a (diff) | |
download | linux-c0f3bb4054ef036e5f67e27f2e3cad9e6512cf00.tar.bz2 |
rethook: Reject getting a rethook if RCU is not watching
Since the rethook_recycle() will involve the call_rcu() for reclaiming
the rethook_instance, the rethook must be set up at the RCU available
context (non idle). This rethook_recycle() in the rethook trampoline
handler is inevitable, thus the RCU available check must be done before
setting the rethook trampoline.
This adds a rcu_is_watching() check in the rethook_try_get() so that
it will return NULL if it is called when !rcu_is_watching().
Fixes: 54ecbe6f1ed5 ("rethook: Add a generic return hook")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/165461827269.280167.7379263615545598958.stgit@devnote2
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/perf_branches.c')
0 files changed, 0 insertions, 0 deletions