tracing: Add condition check to RCU lockdep checks
authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>
Fri, 6 Feb 2015 19:30:50 +0000 (14:30 -0500)
committerSteven Rostedt <rostedt@goodmis.org>
Sun, 8 Feb 2015 00:34:25 +0000 (19:34 -0500)
commita05d59a5673339ef6936d6940cdf68172ce75b9f
treef977bb1c09dd64b1def119467be15220fd3d592b
parentce1039bd3a89e99e4f624e75fb1777fc92d76eb3
tracing: Add condition check to RCU lockdep checks

The trace_tlb_flush() tracepoint can be called when a CPU is going offline.
When a CPU is offline, RCU is no longer watching that CPU and since the
tracepoint is protected by RCU, it must not be called. To prevent the
tlb_flush tracepoint from being called when the CPU is offline, it was
converted to a TRACE_EVENT_CONDITION where the condition checks if the
CPU is online before calling the tracepoint.

Unfortunately, this was not enough to stop lockdep from complaining about
it. Even though the RCU protected code of the tracepoint will never be
called, the condition is hidden within the tracepoint, and even though the
condition prevents RCU code from being called, the lockdep checks are
outside the tracepoint (this is to test tracepoints even when they are not
enabled).

Even though tracepoints should be checked to be RCU safe when they are not
enabled, the condition should still be considered when checking RCU.

Link: http://lkml.kernel.org/r/CA+icZUUGiGDoL5NU8RuxKzFjoLjEKRtUWx=JB8B9a0EQv-eGzQ@mail.gmail.com
Fixes: 3a630178fd5f "tracing: generate RCU warnings even when tracepoints are disabled"
Cc: stable@vger.kernel.org # 3.18+
Acked-by: Dave Hansen <dave@sr71.net>
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
include/linux/tracepoint.h