x86: provide __smp_call_function
This function is used in smp_send_stop(). It's like smp_call_function_mask, but always go to all online cpus, and does not take any locks. It is added to x86_64, but will soon be unified in a common file Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -322,6 +322,38 @@ void unlock_ipi_call_lock(void)
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spin_unlock_irq(&call_lock);
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spin_unlock_irq(&call_lock);
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}
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}
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static void __smp_call_function(void (*func) (void *info), void *info,
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int nonatomic, int wait)
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{
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struct call_data_struct data;
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int cpus = num_online_cpus() - 1;
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if (!cpus)
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return;
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data.func = func;
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data.info = info;
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atomic_set(&data.started, 0);
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data.wait = wait;
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if (wait)
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atomic_set(&data.finished, 0);
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call_data = &data;
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mb();
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/* Send a message to all other CPUs and wait for them to respond */
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send_IPI_allbutself(CALL_FUNCTION_VECTOR);
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/* Wait for response */
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while (atomic_read(&data.started) != cpus)
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cpu_relax();
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if (wait)
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while (atomic_read(&data.finished) != cpus)
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cpu_relax();
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}
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/*
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/*
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* this function sends a 'generic call function' IPI to all other CPU
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* this function sends a 'generic call function' IPI to all other CPU
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* of the system defined in the mask.
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* of the system defined in the mask.
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@ -424,7 +456,7 @@ void smp_send_stop(void)
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/* Don't deadlock on the call lock in panic */
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/* Don't deadlock on the call lock in panic */
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nolock = !spin_trylock(&call_lock);
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nolock = !spin_trylock(&call_lock);
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local_irq_save(flags);
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local_irq_save(flags);
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__smp_call_function_mask(cpu_online_map, stop_this_cpu, NULL, 0);
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__smp_call_function(stop_this_cpu, NULL, 0, 0);
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if (!nolock)
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if (!nolock)
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spin_unlock(&call_lock);
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spin_unlock(&call_lock);
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disable_local_APIC();
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disable_local_APIC();
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