diff options
Diffstat (limited to 'arch/x86_64/kernel/smp.c')
| -rw-r--r-- | arch/x86_64/kernel/smp.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c index 4f67697f5036..af1ec4d23cf8 100644 --- a/arch/x86_64/kernel/smp.c +++ b/arch/x86_64/kernel/smp.c @@ -376,16 +376,20 @@ int smp_call_function_single (int cpu, void (*func) (void *info), void *info, /* prevent preemption and reschedule on another processor */ int me = get_cpu(); if (cpu == me) { - WARN_ON(1); put_cpu(); - return -EBUSY; + 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); put_cpu(); return 0; } +EXPORT_SYMBOL(smp_call_function_single); /* * this function sends a 'generic call function' IPI to all other CPUs |