diff options
| -rw-r--r-- | arch/i386/kernel/smp.c | 4 | ||||
| -rw-r--r-- | arch/x86_64/kernel/smp.c | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c index 31e5c65..9827cf9 100644 --- a/arch/i386/kernel/smp.c +++ b/arch/i386/kernel/smp.c @@ -699,6 +699,10 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, put_cpu(); return -EBUSY; } + + /* Can deadlock when called with interrupts disabled */ + WARN_ON(irqs_disabled()); + spin_lock_bh(&call_lock); __smp_call_function_single(cpu, func, info, nonatomic, wait); spin_unlock_bh(&call_lock); diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c index 9f74c88..32f4d7e 100644 --- a/arch/x86_64/kernel/smp.c +++ b/arch/x86_64/kernel/smp.c @@ -379,6 +379,10 @@ int smp_call_function_single (int cpu, void (*func) (void *info), void *info, put_cpu(); return 0; } + + /* Can deadlock when called with interrupts disabled */ + WARN_ON(irqs_disabled()); + spin_lock_bh(&call_lock); __smp_call_function_single(cpu, func, info, nonatomic, wait); spin_unlock_bh(&call_lock); |