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author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-09-29 11:10:34 -0400 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:38:33 +0200 |
commit | 91a8d46c47e7eb1c53c181e4328a3cfa45ae4ad3 (patch) | |
tree | 61a4f531bd68a386610d6ecaa520bda1d7c80174 /Documentation/markers.txt | |
parent | 531d297569014e8f889b167a2d15d72429faead1 (diff) | |
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markers: documentation fix for teardown
Document the need for a marker_synchronize_unregister() before the end of
exit() to make sure every probe callers have exited the non preemptible
section and thus are not executing the probe code anymore.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/markers.txt')
-rw-r--r-- | Documentation/markers.txt | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/markers.txt b/Documentation/markers.txt index d9f50a1..089f613 100644 --- a/Documentation/markers.txt +++ b/Documentation/markers.txt @@ -50,10 +50,12 @@ Connecting a function (probe) to a marker is done by providing a probe (function to call) for the specific marker through marker_probe_register() and can be activated by calling marker_arm(). Marker deactivation can be done by calling marker_disarm() as many times as marker_arm() has been called. Removing a probe -is done through marker_probe_unregister(); it will disarm the probe and make -sure there is no caller left using the probe when it returns. Probe removal is -preempt-safe because preemption is disabled around the probe call. See the -"Probe example" section below for a sample probe module. +is done through marker_probe_unregister(); it will disarm the probe. +marker_synchronize_unregister() must be called before the end of the module exit +function to make sure there is no caller left using the probe. This, and the +fact that preemption is disabled around the probe call, make sure that probe +removal and module unload are safe. See the "Probe example" section below for a +sample probe module. The marker mechanism supports inserting multiple instances of the same marker. Markers can be put in inline functions, inlined static functions, and |