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master-next 2020-06-05 16:50:22 UTC 2020-06-05
UBUNTU: SAUCE: kselftest: ftrace: check for existing probe

Author: Thadeu Lima de Souza Cascardo
Author Date: 2020-05-29 22:12:38 UTC

UBUNTU: SAUCE: kselftest: ftrace: check for existing probe

Buglink: https://bugs.launchpad.net/bugs/1866972

When testing multiple_kprobes.tc, it will try to add repeated probes. On
5.4, it will return EEXIST, and the test will keep adding probes until it
gets to 256 probes. On 5.3, it will return success, but not add a new
probe. The test will then fail expecting 256 probes, but less than that
were really added.

Fixing the test to check for those existing probes before adding them is
less prone to regressions. After that, the test will succeed, as it skips
trying to add existing probes.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Acked-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

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