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selftests/bpf: Use read_perf_max_sample_freq() in perf_event_stackmap
[ Upstream commit de6d014 ] Currently, perf_event sample period in perf_event_stackmap is set too low that the test fails randomly. Fix this by using the max sample frequency, from read_perf_max_sample_freq(). Move read_perf_max_sample_freq() to testing_helpers.c. Replace the CHECK() with if-printf, as CHECK is not available in testing_helpers.c. Fixes: 1da4864 ("selftests/bpf: Add callchain_stackid") Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20230412210423.900851-2-song@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>
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