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| author | Michal Simek <[email protected]> | 2012-03-30 12:10:03 +0200 |
|---|---|---|
| committer | Michal Simek <[email protected]> | 2012-03-30 12:10:03 +0200 |
| commit | 6a4770e335bd4df0a4577146f76e116ab6e23f40 (patch) | |
| tree | 305056c20b6ccf3a4fed00e9e32f3a1dd039cd70 /kernel/rcupdate.c | |
| parent | ac64a9caa55bdfd8d24784f25c68cb7919ddabe3 (diff) | |
| parent | f52b69f86e27903d6896ed5fa7cd280fec8de532 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next
Diffstat (limited to 'kernel/rcupdate.c')
| -rw-r--r-- | kernel/rcupdate.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index 2bc4e135ff23..a86f1741cc27 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -88,6 +88,9 @@ EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); * section. * * Check debug_lockdep_rcu_enabled() to prevent false positives during boot. + * + * Note that rcu_read_lock() is disallowed if the CPU is either idle or + * offline from an RCU perspective, so check for those as well. */ int rcu_read_lock_bh_held(void) { @@ -95,6 +98,8 @@ int rcu_read_lock_bh_held(void) return 1; if (rcu_is_cpu_idle()) return 0; + if (!rcu_lockdep_current_cpu_online()) + return 0; return in_softirq() || irqs_disabled(); } EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); |