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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-21 15:52:04 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-21 15:52:04 +1100 |
| commit | a02efb906d12c9d4eb2ab7c59049ba9545e5412d (patch) | |
| tree | bf1f6467978ec63a22f42299ecac2ee7f7e73336 /Documentation/markers.txt | |
| parent | 84dfcb4b318463cd4883b6a19937824f49aee564 (diff) | |
| parent | 2515ddc6db8eb49a79f0fe5e67ff09ac7c81eab4 (diff) | |
Merge commit 'origin' into master
Manual merge of:
arch/powerpc/Kconfig
arch/powerpc/include/asm/page.h
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 d9f50a19fa0..089f6138fcd 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 |