linux/kernel/tracepoint.c, branch v2.6.30

tracepoints: dont update zero-sized tracepoint sections

2009-03-18T18:55:00Z

Zero-sized tracepoint sections can occur if tracing is enabled but no tracepoint is defined. Do not emit a warning in that case. Cc: Frederic Weisbecker Cc: Steven Rostedt Cc: Jaswinder Singh Rajput LKML-Reference: <1237394936.3132.1.camel@localhost.localdomain> Signed-off-by: Ingo Molnar

tracing: fix oops in tracepoint_update_probe_range()

2009-03-18T17:54:39Z

Change this crash: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] tracepoint_update_probe_range+0x1f/0x9b PGD 13d5fb067 PUD 13d688067 PMD 0 Oops: 0000 [#1] SMP To a more debuggable WARN_ONCE(). Signed-off-by: Jaswinder Singh Rajput Cc: Frederic Weisbecker Cc: Steven Rostedt LKML-Reference: <1237394936.3132.1.camel@localhost.localdomain> [ moved the check outside the lock and added a WARN_ON(). ] Signed-off-by: Ingo Molnar

markers/tracpoints: fix non-modular build

2008-11-16T08:52:03Z

fix: kernel/marker.c: In function 'marker_module_notify': kernel/marker.c:905: error: 'MODULE_STATE_COMING' undeclared (first use in this function) [...] Signed-off-by: Ingo Molnar

tracepoints: use modules notifiers

2008-11-16T08:01:35Z

Impact: cleanup Use module notifiers for tracepoint updates rather than adding a hook in module.c. Signed-off-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar

tracepoints: fix disable

2008-11-16T08:01:31Z

Impact: fix race Set the probe array pointer to NULL when the tracepoint is disabled. The probe array point not being NULL could generate a race condition where the reader would dereference a freed pointer. Signed-off-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar

tracepoint: introduce *_noupdate APIs.

2008-11-03T09:28:52Z

Impact: add new tracepoint APIs to allow the batched registration of probes new APIs separate tracepoint_probe_register(), tracepoint_probe_unregister() into 2 steps. The first step of them is just update tracepoint_entry, not connect or disconnect. this patch introduces tracepoint_probe_update_all() for update all. these APIs are very useful for registering lots of probes but just updating once. Another very important thing is that *_noupdate APIs do not require module_mutex. Signed-off-by: Lai Jiangshan Acked-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar

tracepoint: simplification for tracepoints using RCU

2008-11-03T09:28:30Z

Impact: simplify implementation Now, unused memory is handled by struct tp_probes. old code use these three field to handle unused memory. struct tracepoint_entry { ... struct rcu_head rcu; void *oldptr; unsigned char rcu_pending:1; ... }; in this way, unused memory is handled by struct tracepoint_entry. it bring reenter bug(it was fixed) and tracepoint.c is filled full of ".*rcu.*" code statements. this patch removes all these. and: rcu_barrier_sched() is removed. Do not need regain tracepoints_mutex after tracepoint_update_probes() several little cleanup. Signed-off-by: Lai Jiangshan Acked-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar

tracepoint: check if the probe has been registered

2008-10-27T15:45:46Z

Impact: fix kernel crash that can trigger during tracing If we try to remove a probe that has not been already registered, the tracepoint_entry_remove_probe() function will dereference a NULL pointer. Check the probe before removing it to avoid crashes. Signed-off-by: Frederic Weisbecker Acked-by: Mathieu Desnoyers Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar

tracepoints: fix reentrancy

2008-10-14T08:38:23Z

The tracepoints had the same problem markers did have wrt reentrancy. Apply a similar fix using a rcu_barrier after each tracepoint mutex lock. Signed-off-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar

tracepoints: use rcu sched

2008-10-14T08:38:21Z

Make tracepoints use rcu sched. (cleanup) Signed-off-by: Mathieu Desnoyers Signed-off-by: Ingo Molnar