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| author | Andreas Gruenbacher | 2017-10-16 15:06:23 +0200 |
|---|---|---|
| committer | Andreas Gruenbacher | 2017-10-16 15:06:23 +0200 |
| commit | 0c9a66ec0e362fe9aff545b755430e56f58f2b96 (patch) | |
| tree | 3ffc63e84133d640b9d7def9102ab62a30da460e /kernel/rcu/tree.c | |
| parent | c2c4be28c248232d5bdfa5911f3b721db771f4f0 (diff) | |
| parent | 9ca250a5137f3df7ffac58b49660beadd5926ace (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 1250e4bd4b85..0c44c7b42e6d 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -882,6 +882,11 @@ void rcu_irq_exit(void) RCU_LOCKDEP_WARN(!irqs_disabled(), "rcu_irq_exit() invoked with irqs enabled!!!"); rdtp = this_cpu_ptr(&rcu_dynticks); + + /* Page faults can happen in NMI handlers, so check... */ + if (READ_ONCE(rdtp->dynticks_nmi_nesting)) + return; + WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && rdtp->dynticks_nesting < 1); if (rdtp->dynticks_nesting <= 1) { @@ -1015,6 +1020,11 @@ void rcu_irq_enter(void) RCU_LOCKDEP_WARN(!irqs_disabled(), "rcu_irq_enter() invoked with irqs enabled!!!"); rdtp = this_cpu_ptr(&rcu_dynticks); + + /* Page faults can happen in NMI handlers, so check... */ + if (READ_ONCE(rdtp->dynticks_nmi_nesting)) + return; + oldval = rdtp->dynticks_nesting; rdtp->dynticks_nesting++; WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && |