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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2016-03-09 17:58:41 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-03-09 17:58:41 +0100 |
| commit | dc17147de328a74bbdee67c1bf37d2f1992de756 (patch) | |
| tree | 16187ae1d87d3b09619b452ac9e13864aa12aff2 | |
| parent | Linux 4.5-rc7 (diff) | |
| download | linux-dc17147de328a74bbdee67c1bf37d2f1992de756.tar.xz linux-dc17147de328a74bbdee67c1bf37d2f1992de756.zip | |
tracing: Fix check for cpu online when event is disabled
Commit f37755490fe9b ("tracepoints: Do not trace when cpu is offline") added
a check to make sure that tracepoints only get called when the cpu is
online, as it uses rcu_read_lock_sched() for protection.
Commit 3a630178fd5f3 ("tracing: generate RCU warnings even when tracepoints
are disabled") added lockdep checks (including rcu checks) for events that
are not enabled to catch possible RCU issues that would only be triggered if
a trace event was enabled. Commit f37755490fe9b only stopped the warnings
when the trace event was enabled but did not prevent warnings if the trace
event was called when disabled.
To fix this, the cpu online check is moved to where the condition is added
to the trace event. This will place the cpu online check in all places that
it may be used now and in the future.
Cc: stable@vger.kernel.org # v3.18+
Fixes: f37755490fe9b ("tracepoints: Do not trace when cpu is offline")
Fixes: 3a630178fd5f3 ("tracing: generate RCU warnings even when tracepoints are disabled")
Reported-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | include/linux/tracepoint.h | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index acfdbf353a0b..be586c632a0c 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -134,9 +134,6 @@ extern void syscall_unregfunc(void); void *it_func; \ void *__data; \ \ - if (!cpu_online(raw_smp_processor_id())) \ - return; \ - \ if (!(cond)) \ return; \ prercu; \ @@ -343,15 +340,19 @@ extern void syscall_unregfunc(void); * "void *__data, proto" as the callback prototype. */ #define DECLARE_TRACE_NOARGS(name) \ - __DECLARE_TRACE(name, void, , 1, void *__data, __data) + __DECLARE_TRACE(name, void, , \ + cpu_online(raw_smp_processor_id()), \ + void *__data, __data) #define DECLARE_TRACE(name, proto, args) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \ - PARAMS(void *__data, proto), \ - PARAMS(__data, args)) + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()), \ + PARAMS(void *__data, proto), \ + PARAMS(__data, args)) #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \ + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \ PARAMS(void *__data, proto), \ PARAMS(__data, args)) |