diff options
Diffstat (limited to 'arch/x86/kernel/smp_64.c')
| -rw-r--r-- | arch/x86/kernel/smp_64.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/arch/x86/kernel/smp_64.c b/arch/x86/kernel/smp_64.c index 1d8b863fa357..aa2edb7f3a51 100644 --- a/arch/x86/kernel/smp_64.c +++ b/arch/x86/kernel/smp_64.c @@ -322,6 +322,38 @@ void unlock_ipi_call_lock(void) spin_unlock_irq(&call_lock); } +static void __smp_call_function(void (*func) (void *info), void *info, + int nonatomic, int wait) +{ + struct call_data_struct data; + int cpus = num_online_cpus() - 1; + + if (!cpus) + return; + + data.func = func; + data.info = info; + atomic_set(&data.started, 0); + data.wait = wait; + if (wait) + atomic_set(&data.finished, 0); + + call_data = &data; + mb(); + + /* Send a message to all other CPUs and wait for them to respond */ + send_IPI_allbutself(CALL_FUNCTION_VECTOR); + + /* Wait for response */ + while (atomic_read(&data.started) != cpus) + cpu_relax(); + + if (wait) + while (atomic_read(&data.finished) != cpus) + cpu_relax(); +} + + /* * this function sends a 'generic call function' IPI to all other CPU * of the system defined in the mask. @@ -424,7 +456,7 @@ void smp_send_stop(void) /* Don't deadlock on the call lock in panic */ nolock = !spin_trylock(&call_lock); local_irq_save(flags); - __smp_call_function_mask(cpu_online_map, stop_this_cpu, NULL, 0); + __smp_call_function(stop_this_cpu, NULL, 0, 0); if (!nolock) spin_unlock(&call_lock); disable_local_APIC(); |