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author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-05-22 02:41:36 -0700 |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-06-10 13:37:10 -0700 |
commit | d62840995a99c9766803d54e9d7923f247a1c1db (patch) | |
tree | d278186c5541f3294a263edc19a15b4e1809cb06 /kernel/rcutree.c | |
parent | 317ddd256b9c24b0d78fa8018f80f1e495481a10 (diff) | |
download | op-kernel-dev-d62840995a99c9766803d54e9d7923f247a1c1db.zip op-kernel-dev-d62840995a99c9766803d54e9d7923f247a1c1db.tar.gz |
trace: Allow idle-safe tracepoints to be called from irq
__DECLARE_TRACE_RCU() currently creates an _rcuidle() tracepoint which
may safely be invoked from what RCU considers to be an idle CPU.
However, these _rcuidle() tracepoints may -not- be invoked from the
handler of an irq taken from idle, because rcu_idle_enter() zeroes
RCU's nesting-level counter, so that the rcu_irq_exit() returning to
idle will trigger a WARN_ON_ONCE().
This commit therefore substitutes rcu_irq_enter() for rcu_idle_exit()
and rcu_irq_exit() for rcu_idle_enter() in order to make the _rcuidle()
tracepoints usable from irq handlers as well as from process context.
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/rcutree.c')
0 files changed, 0 insertions, 0 deletions