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authorLinus Torvalds <torvalds@linux-foundation.org>2013-06-13 12:36:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-06-13 12:36:42 -0700
commitcb7e9704d58dab4b1b4284903e6bf973ade3863e (patch)
treebd66e94c4e34a9b89d4265591eb683a4fe8dad96 /include
parentdcae7f2dfcc6c948c313d72df6a0d7e466c6707a (diff)
parent971394f389992f8462c4e5ae0e3b49a10a9534a3 (diff)
Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull RCU fixes from Paul McKenney: "I must confess that this past merge window was not RCU's best showing. This series contains three more fixes for RCU regressions: 1. A fix to __DECLARE_TRACE_RCU() that causes it to act as an interrupt from idle rather than as a task switch from idle. This change is needed due to the recent use of _rcuidle() tracepoints that can be invoked from interrupt handlers as well as from idle. Without this fix, invoking _rcuidle() tracepoints from interrupt handlers results in splats and (more seriously) confusion on RCU's part as to whether a given CPU is idle or not. This confusion can in turn result in too-short grace periods and therefore random memory corruption. 2. A fix to a subtle deadlock that could result due to RCU doing a wakeup while holding one of its rcu_node structure's locks. Although the probability of occurrence is low, it really does happen. The fix, courtesy of Steven Rostedt, uses irq_work_queue() to avoid the deadlock. 3. A fix to a silent deadlock (invisible to lockdep) due to the interaction of timeouts posted by RCU debug code enabled by CONFIG_PROVE_RCU_DELAY=y, grace-period initialization, and CPU hotplug operations. This will not occur in production kernels, but really does occur in randconfig testing. Diagnosis courtesy of Steven Rostedt" * 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: rcu: Fix deadlock with CPU hotplug, RCU GP init, and timer migration rcu: Don't call wakeup() with rcu_node structure ->lock held trace: Allow idle-safe tracepoints to be called from irq
Diffstat (limited to 'include')
-rw-r--r--include/linux/tracepoint.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 2f322c38bd4..f8e084d0fc7 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -145,8 +145,8 @@ static inline void tracepoint_synchronize_unregister(void)
TP_PROTO(data_proto), \
TP_ARGS(data_args), \
TP_CONDITION(cond), \
- rcu_idle_exit(), \
- rcu_idle_enter()); \
+ rcu_irq_enter(), \
+ rcu_irq_exit()); \
}
#else
#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)